Relevant bibliographies by topics / Tree seedling

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Tree seedling'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Tree seedling"

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Vasconcelos, Heraldo L., and J. Malcolm Cherrett. "Leaf-cutting ants and early forest regeneration in central Amazonia: effects of herbivory on tree seedling establishment." Journal of Tropical Ecology 13, no. 3 (1997): 357–70. http://dx.doi.org/10.1017/s0266467400010567.

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ABSTRACTThe effects of herbivory by the leaf-cutting antAtta laevigataFr. Smith on the re-establishment of forest trees in an abandoned farm near Manaus, central Amazonia, were investigated. Experimental seedling transplants and observations on seedlings which emerged naturally in the study area showed that damage by leaf-cutting ants negatively affected tree seedling survival and growth. However, excluding leaf-cutting ants from experimental plots for 20 mo did not significantly increase tree seedling densities. The number of seedlings emerging varied considerably between plots and this obscured any effect the ants may have had on seedling survivorship. Taller seedlings, and seedlings attacked only once, suffered less mortality than smaller seedlings and seedlings attacked twice or more. In general, mortality was greater for those species preferred by the ants, indicating that selective herbivory by leaf-cutting ants affects tree species composition. The number of seedlings attacked byA. laevigataremained approximately constant throughout the period of this study in spite of the fact that the number available for attack increased. Thus, the chance of any individual seedling being attacked declined with time, suggesting that the effect ofAttaherbivory on tree establishment is stronger during the first few years of forest regeneration.
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Thompson, T. E., and L. J. Grauke. "Pecan Tree Growth and Precocity." Journal of the American Society for Horticultural Science 128, no. 1 (2003): 63–66. http://dx.doi.org/10.21273/jashs.128.1.0063.

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Precocity of pecan [Carya illinoinensis (Wangenh.) C. Koch] seedlings (year of first fruit production) was studied in relation to original seed measurements (nut weight, buoyancy, volume, and density) and in relation to growth index (GI) measurements of seedling trees for 4 years. A total of 2,071 pecan seedlings, representing nine controlled-cross families, were studied. Original seed measurements were not related to precocity of resultant seedling trees; but seed weight, buoyancy, and volume were significantly correlated with seedling growth rates. Nut density was negatively related to growth of seedlings. These relationships show the importance of original seed measurements and seed parentage in determining seedling growth, and have direct relevance in pecan nursery operations to increase general rootstock seedling vigor. Seedling growth rate was significantly correlated to precocity levels, with measurements taken in the later years of the study showing the highest correlations with precocity. This strong growth-precocity relationship may have negative genetic implications since a common breeding objective is to produce more precocious cultivars that maintain smaller tree size in mature orchards.
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Santos, Gildomar Alves dos, David Francis Robert Philip Burslem, Milton Serpa de Meira Jr, and Stanislau Parreira Cardozo. "Introduction of native tree species into degraded Cerrado vegetation." Interação 21, no. 2 (2021): 61–84. http://dx.doi.org/10.53660/inter-102-s127.

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Experimental restoration using tree seedlings is a common strategy for accelerating succession on degraded post-agricultural land formerly occupied by Cerrado vegetation. Seedling growth in degraded tropical lands is constrained by various factors. The goal of this study was to evaluate the seedling growth and survival of seven native tree species used to accelerate forest recovery in a gully area with stressful environmental conditions. The experimental design involved fenced and unfenced blocks, presence and absence of fertilization and use of an adhesive to prevent ant herbivory (four treatments with four replicates). Seedlings were planted in December 2006 and collection of data on seedling basal diameter, height, mortality and herbivory started on January 24th 2007 and continued every three months, until final data collection on January 31st 2009 (9 measurement dates). Overall seedling survival was 38 % and protecting seedlings did not influence growth, but seedlings grew faster in response to the addition of fertilizer containing N, P and K. The use of the adhesive Tanglefoot to exclude leaf cutter ants had no influence on growth. Fencing reduced seedling mortality, but combining fencing with Tanglefoot did not. Nutrient availability limits seedling growth and survival in the gully. Direct planting of seedlings of native trees may accelerate succession in degraded Cerrado lands subject to interventions that overcome constraints on seedling growth and survival.
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Woods, Michaela J., Meredith Cobb, Katie Hickle, and Ryan W. McEwan. "Assessing the Efficacy of Seedling Planting as a Forest Restoration Technique in Temperate Hardwood Forests Impacted by Invasive Species." Forests 10, no. 8 (2019): 699. http://dx.doi.org/10.3390/f10080699.

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The emerald ash borer (Agrilus planipennis Fairmaire; EAB) is an invasive insect that causes mortality of trees in the genus Fraxinus, creating canopy gaps that may facilitate invasion by exotic plants. Planting native tree seedlings under EAB-infested Fraxinus may accelerate succession and preclude invasive plant expansion; however, the effectiveness of this approach has not been experimentally tested. We assessed understory seedling planting of Quercus rubra, Carya laciniosa, and Juglans cinerea in EAB-infested forests, where the invasive shrub Lonicera maackii (Amur honeysuckle) was removed. We tested whether the use of plastic tree shelters (“tree tubes”) or planting season (fall versus spring) contributed to the success of the reforestation plan by measuring growth rates (cm/yr) and survivorship two and seven years after planting. After seven years, seedling survivorship was <25% for all species and planting techniques. Quercus rubra exhibited poor survivorship with one seedling surviving to the conclusion of the experiment. Juglans cinerea and C. laciniosa had higher survivability and growth rates than did Q. rubra after two and seven years. Effects of tree tubes were weak and temporary. After 2 years, Q. rubra seedling survivorship was higher in tree tubes; however, by the end of the experiment 29 of the 30 Q. rubra seedlings in tree tubes had died. Juglans cinerea seedlings grew faster when planted in the fall compared to the spring, but overall survivorship of these seedlings was unaffected by planting season. Neither the use of tree shelters nor the planting season contributed to the growth or survival of C. laciniosa seedlings. In summary, our results indicate that seedling planting of Carya and Juglans may be a useful way to increase biodiversity in regenerating forests; however, the resource-expensive processes of over-wintering seedlings and using tree shelters may not increase the success of reforestation efforts.
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Nichols, J. Doland, Victor K. Agyeman, Francis Balfour Agurgo, Michael R. Wagner, and Joseph R. Cobbinah. "Patterns of seedling survival in the tropical African tree Milicia excelsa." Journal of Tropical Ecology 15, no. 4 (1999): 451–61. http://dx.doi.org/10.1017/s0266467499000942.

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The spatial patterns of canopy tree and seedling life stages in the African Tropical Tree Milicia excelsa were examined to test the Janzen–Connell hypothesis (escape hypothesis). The Janzen–Connell hypothesis states that the mortality of seeds and seedlings is highest near the adult tree and declines with distance away from the adult tree of the same species. This hypothesis argues that this effect is partially responsible for maintaining the high tree species diversity of tropical forests. Solar radiation and fruit dispersal were investigated as possible explanations of observed patterns in seedling distribution. Milicia excelsa trees ≥30 cm DBH were found to be randomly dispersed and occurred at a density of ≤1 ha. Milicia excelsa seedlings were located in small clumps between parent trees and up to 150 m from parents at a mean density of 65 seedlings ha−1. Fruits were in abundance (>9000 on the ground) beneath female trees. Light levels at locations of natural seedlings ranged from 2–29% of full irradiance. Planted seedlings did not suffer greater mortality closer to adult conspecifics, and survived at light levels between 2–37% of full irradiance. Phytolyma spp., gall-forming psyllids which cause high mortality in Milicia seedlings in large openings and plantations, were not observed on any natural or planted seedlings, although galls were present in the crowns of dominant trees.
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Kunstler, Georges, Joël Chadœuf, Etienne K. Klein, Thomas Curt, Monique Bouchaud, and Jacques Lepart. "Tree colonization of sub-Mediterranean grasslands: effects of dispersal limitation and shrub facilitation." Canadian Journal of Forest Research 37, no. 1 (2007): 103–15. http://dx.doi.org/10.1139/x06-225.

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Encroachment of trees into low-productivity grasslands is a serious threat to grassland biodiversity throughout Europe. Although the rate of encroachment of trees into grassland is variable and poorly understood, it is thought to result from variation in tree seedling recruitment, which is limited mainly by the availability of safe sites and the dispersal distances of propagules. In this study, we established spatially explicit models of seedling recruitment for two major sub-Mediterranean trees: Quercus pubescens Willd. and Fagus sylvatica L. We quantified the spatial distribution of Q. pubescens and F. sylvatica seedlings up to 20 years old at three grassland sites. We also quantified the spatial distribution and size of mature trees and of the two dominant species of shrubs, Buxus sempervirens L. and Juniperus communis L., at each of the three sites. Ninety-eight percent of the regeneration took place under shrub canopy. Quercus pubescens seedlings showed higher seedling production per unit of canopy area and longer mean effective dispersal distances than did F. sylvatica seedlings. Quercus pubescens seedlings also had a large advantage over F. sylvatica seedlings for establishment in open areas. Juniperus shrubs were better safe sites for the establishment of Q. pubescens and F. sylvatica seedlings than were Buxus shrubs. We calculated indices of seedling dispersal limitation and safe site availability for recruitment for four dates. In the dolomitic Causse grasslands examined in this study, the availability of safe sites for germination and survival was far more important than seedling dispersal limitation for recruitment of both tree species.
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CHAROENSUK, Anun, Mullica JAROENSUTASINEE, and Krisanadej JAROENSUTASINEE. "Seed Production and Seedling Establishment of Parah Trees in Khao Nan National Park, Thailand." Walailak Journal of Science and Technology (WJST) 15, no. 3 (2017): 213–23. http://dx.doi.org/10.48048/wjst.2018.3928.

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Parah (Elateriospermum tapos Blume) is a native species of southern Thailand, and is a dominant tree in Khao Nan National Park. There have been few studies of Parah seeds or of seedling establishment. Biotic and abiotic environmental factors interact with seeds and may affect the future of tree populations. This is the first study to determine the factors affecting seeds and seedlings of Parah trees in Khao Nan National Park, Thailand, during 2014 - 2016. We tested 3 factors: (1) parental tree diameter at breast height (DBH), (2) altitude, and (3) distance from the main road. We studied seeds collected from trees, seeds harvested by humans, seed predation, seeds left on the forest floor, and rotten seeds. We measured seed weight, seed size, seedling height, and seedling root collar diameter (RCD). Our results showed that the number of seeds and seedlings per tree, seed weight, seed size, seed harvesting, seed predation, seeds left on the forest floor, rotten seeds, and seedling height varied between the years of study. There was no difference in seeds harvested by humans from 2014 - 2016. The number of seeds per tree and seeds harvested by humans were positively associated with parental tree DBH in 2015 and 2016. The number of seeds left on the forest floor was positively associated with parental tree DBH, and distance from the main road, but was negatively associated with altitude, in 2015, and there was no association in 2016. The number of seeds predated by frugivores was positively associated with altitude in 2016. The number of seedlings per tree was positively associated with distance from the main road. Seedling height was positively associated with distance from the main road, and negatively associated with tree DBH in 2015 and altitude in both years. We found significant results which led to the conclusion that seed production and seeds harvested by humans were positively associated with parental tree size.
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de Steven, Diane. "Tropical tree seedling dynamics: recruitment patterns and their population consequences for three canopy species in Panama." Journal of Tropical Ecology 10, no. 3 (1994): 369–83. http://dx.doi.org/10.1017/s0266467400008038.

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ABSTRACTA study of seedling demography of three shade-tolerant canopy tree species (Quararibea asterolepis, Trichilia tuberculata, and Tetragastris panamensis) was initiated to integrate with long-term studies of tree fruit production and of tree population dynamics on Barro Colorado Island, Panama. Over a five-year period, all seedlings (height <50 cm) and small saplings (height ≥50 cm to dbh 1 cm) were measured and monitored in permanent tree-centred transects (N = 10–11 trees per species). Survival rates increased with plant size class and were similar among species. Maximum height growth rates increased with increasing plant size, but average growth rates did not; this disparity suggests the importance of release from understorey suppression for long-term recruitment success. Among the three species, Quararibea had the lowest standing seedling densities and almost no sapling recruitment, whereas Tetragastris had the highest densities of both seedlings and saplings; Trichilia seedling and sapling densities were intermediate. In all three species, a few trees produced very high seedling and sapling densities in comparison with the sample average. All three species exhibited a year of exceptionally high new seedling recruitment during the study period; these good years were not coincident among the species but instead reflected the species' phenological differences. Since seedling survival becomes relatively constant and high after the first few years of life (c. 80% y−1), such large new cohorts persist as a year-class effect in the seedling population and thus maintain seedling numbers over time. The interspecific differences in seedling and sapling dynamics were consistent with overall 10-year trends of a declining Quararibea population, a stable Trichilia population, and an increasing Tetragastris population.
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Ketter, Benjamin L., and Ricardo M. Holdo. "Strong competitive effects of African savanna C4 grasses on tree seedlings do not support rooting differentiation." Journal of Tropical Ecology 34, no. 1 (2018): 65–73. http://dx.doi.org/10.1017/s0266467418000020.

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Abstract:Rooting differentiation between established trees and grasses has been well documented in savannas, but it remains unclear to what extent tree-grass rooting differences affect competition between newly established seedlings and grasses. To examine this question, a greenhouse experiment was conducted at the University of Missouri, USA. Twenty 3-mo-old seedlings each of two African savanna tree species (Acacia nigrescens and Colophospermum mopane) were grown for 8 mo with two crossed factors: grass competition and irrigation depth. Strong negative effects of grass competition on final seedling biomass and leaf photosynthetic and stomatal conductance occurred in both tree species, but no effects of irrigation depth were detected. There was a clear tree species by grass competition interaction, suggesting interspecific variation in competitive response. The results emphasize the importance of below-ground competition with grasses for physiological and morphological responses of tree seedlings, while minimizing the importance of tree-grass rooting depth differences as a factor in modulating the competitive response of trees to grasses at the seedling stage.
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Chapman, Colin A., and Lauren J. Chapman. "Frugivory and the fate of dispersed and non-dispersed seeds of six African tree species." Journal of Tropical Ecology 12, no. 4 (1996): 491–504. http://dx.doi.org/10.1017/s026646740000972x.

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ABSTRACTThe relationship between seedling recruitment (under and away from parent trees) and the behaviour of seed dispersers and predators, was explored in a three-year study in Kibale National Park, Uganda. On the basis of 1261 hours of observation, the foraging activity of the diurnal frugivores which fed on fruit from six tree species was quantified. The fate of dispersed and non-dispersed seeds and seedlings was examined experimentally. The findings suggest that a trade-off exists between factors that promote seedling growth in areas with high seedling density and factors that promote dispersal by frugivores. For example, dispersal ofMimusops bagshaweiincreases both seed and seedling survival; seeds placed away from adult conspecifics had a 8% lower probability of disappearing than seeds placed under adults and seedlings away from adults had a 30% greater probability of surviving than seedlings grown under adults. In contrast, forUvariopsis congensis, dispersed seeds had a 56% greater probability of disappearing than seeds directly under a parent tree, while the survival of dispersed and non-dispersed seedlings was similar. Non-dispersed seed and seedling disappearance were correlated with the percentage of the fruit crop removed from focal trees, suggesting that the ability to survive under an adult maybe related to other aspects of the tree's life history.
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Dissertations / Theses on the topic "Tree seedling"

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Baumer, Marilyn Cabrini. "Tree Seedling Establishment Under the Native Shrub, Asimina Triloba." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1183587955.

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Botha, Susan. "The influence of rainfall variability on savanna tree seedling establishment." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/6238.

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Includes bibliographical references (leaves 111-114).<br>My thesis investigates the rainfall requirements necessary for tree seedling survival of different savanna species in the first year of growth. Results from a field drought experiment showed that dry season survival for seedlings of Acacia nigrescens and Philenaptera vialacea was not related to wet season length. Instead mortality was highest immediately after germination despite irrigation to minimize dry spells. Furthermore there was no relationship between seedling size and the length of the dry spell seedlings of Acacia nigrescens and Philenaptera vialacea grown in basalt clay in the greenhouse, could survive. This was in contrast to seedlings of Scleracarya birrea and Terminalia sericea grown in granite sand, where number of dry days survived increased with number of growth days received. There was no significant differences in rainfall variability (t-test: tL III = 1.56, P = 0.121, F-ratio = 1.13) between a semi-arid (Satara) and semi-mesic (Pretoriuskop) site within the Kruger National Park despite significant differences in rainfall totals (t-test: tl, III = 4.40, P < 0.000, F-ratio 3.41). Results from a soil-water model show that seedling recruitment can occur at least twice a decade in the Satara area, which should be frequent enough to allow a transition to a woodland state over time. These results suggest that a mechanism other than the effect of rainfall variability on seedling establishment is required to explain the co-existence of trees and grasses at Satara. The lack of field germination, the absence of a seed bank and the germination of added seed at the field experiment site after rainfall emphasizes seed limitation as an important bottleneck at Satara. Higher herbivore biomass at Satara compared to Pretoriuskop may limit seedling establishment opportunities by destroying seed and seedlings of tree species.
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Agha, N. S. A. "High-density planting system for Bramley's seedling apple trees." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373464.

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Bebber, Daniel Patrick. "Dipterocarp seedling growth and mortality in the understorey : roles of herbivory and drought." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289347.

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Self, Guy K. "Studies of xylopodium formation and early seedling growth in Kielmeyera coriacea Mart." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/14374.

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Holgén, Per. "Seedling performance, shelter tree increment and recreation values in boreal shelterwood stands /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5854-4.pdf.

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Olave, Rodrigo Javier. "Tree seedling production for multifunctional land use systems in cool temperate climates." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426722.

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Norberg, Gisela. "Steam treatment of forest ground vegetation to improve tree seedling establishment and growth /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-6054-9.pdf.

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Ball, T. "Effect of canopy gaps on tree seedling ecophysiology in a Jamaican montane rainforest." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596313.

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A controlled experiment was established in primary upper montane rain forest (UMRF) in the Blue Mountains of Jamaica to investigate the ecophysiological response of seedlings of seven tree species to canopy gap formation. The group included one invasive species, the Australian tree <I>Pittosporum undulatum,</I> with a mixture of native and endemic shade tolerant and intolerant species. The main aim was to assess whether the known approximate light demand of seedlings of the species for regeneration correlated to the relative ecophysiological performance of the seedlings across a light gradient. Gaps were created artificially by de-branching of canopy trees, ensuring minimal possible damage to the seedling bank. Resulting light levels were equivalent to those associated with damage from a major hurricane. The photosynthetic characteristics, morphology and longevity of shade leaves and seedlings were investigated in naturally growing seedlings on four gap and four understorey control plots. Above- and below-ground competition and the effect of leaf masking and removal were investigated in separate sub-experiments using potted seedlings. In the understorey, mean levels of total diurnal photosynthetic photon flux density (PPFD) on the uppermost leaf were 2.14% of diurnal integrated above canopy levels. No significant variation occurred among the sevens species, whether defined by instantaneous diffuse light (under cloud), or the proportion of cloud-free time for which sunflecks were experienced. The three indices of light level showed strong, though not always 1:1, interrelationships. The findings give strong ecophysiological backing to existing knowledge of the species' regenerational ecology across a range of disturbed and steady state environments in UMRF. They also give information as to relative physiological performance of native species and the problematic invasive tree <I>Pittosporum undulatum. </I>
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West, Lee. "Effects of Soil Fungi on Tree Seedling Establishment in a Southeastern Coastal Plain Forest." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46180.

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Effects of fungi and overstory composition on tree seedling survival and growth were investigated in closed canopy upland forests in the coastal plain of South Carolina. Seedlings of Quercus alba, Cornus florida and Pinus taeda were planted in the understory of two forest types -naturally regenerated hardwood and planted pine. Fungal species composition and biomass were experimentally manipulated with a treatment of the fungicide captan. In contrast with other studies conducted in different systems (sand dune, grassland, and old field), the effects of soil fungi were minor in a closed canopy forest. Only Q. alba showed a significant response to the fungicide (p < 0.05) treatment with increased growth. Overstory composition had no significant effect on growth or survival for any of the species. Both of the commercially desirable species (Q. alba and P. taeda) had reasonable survival ( @ 60%). Both also maintained positive, though modest, growth. This suggests that an advance regeneration pool could be established successfully by artificial regeneration.<br>Master of Science
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Books on the topic "Tree seedling"

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Manchester, Edwin H. Tree shelters show promise for oak regeneration. U.S. Dept. of Agriculture, Forest Service, Cooperative Forestry, 1988.

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Manchester, Edwin H. Tree shelters show promise for oak regeneration. U.S. Dept. of Agriculture, Forest Service, Cooperative Forestry, 1988.

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Colombo, S. J. Containerized tree seedling research and development in Ontario, 1984-1985. Great Lakes Forestry Centre, Canadian Forestry Service, 1988.

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Miller, Joan H. Organic & compost-based growing media for tree seedling nurseries. World Bank, 1995.

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Racey, G. D. Moisture retaining materials for tree seedling packaging: A literature review. Ontario Tree Improvement and Forest Biomass Institute, 1988.

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Harvey, Eileen M. Forestell. A bibliography on competition, tree seedling characteristics and related topics. Ontario Ministry of Natural Resources, Forest Research Institute, 1993.

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Bickelhaupt, Donald H. Effect of horse manure on white pine seedling production in a forest tree nursery. State University of New York, College of Environmental Science and Forestry, 1987.

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Devine, Warren D. Influence of four tree shelter types on microclimate and seedling performance of Oregon white oak and western redcedar. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 2008.

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Elefritz, Mark. The care and planting of tree seedlings on your woodland. Oregon State University Extension Service, 1998.

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Emmingham, William H. Seedling care and handling. Oregon State University Extension Service, 1996.

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Book chapters on the topic "Tree seedling"

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Iakovoglou, Valasia. "Effect of Irrigation Frequency on Tree Seedling Production." In Sustainable Bioresource Management. Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780429284229-15.

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Choudbury, B. I., and M. L. Khan. "Seedling dynamics and ecology of iGymnocladus assamicus/i." In Himalayan soap pod tree (iGymnocladus assamicus/i): an ecologically and economically important tree on the brink of extinction. CABI, 2020. http://dx.doi.org/10.1079/9781786391988.0108.

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Biddle, Julianne, Quang Nguyen, Zhihua H. Mu, Mike Foale, and Steve Adkins. "Germplasm Reestablishment and Seedling Production: Embryo Culture." In Coconut Biotechnology: Towards the Sustainability of the ‘Tree of Life’. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44988-9_10.

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Huston, Michael A., Milena Holmgren, and Michelle B. Kreh. "Response of Understory Tree Seedling Populations to Spatiotemporal Variation in Soil Moisture." In Ecological Studies. Springer New York, 2003. http://dx.doi.org/10.1007/978-1-4613-0021-2_14.

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Weltzin, Jake F., and Philip B. Allen. "Tree Seedling Recruitment in a Temperate Deciduous Forest: Interactive Effects of Soil Moisture, Light, and Slope Position." In Ecological Studies. Springer New York, 2003. http://dx.doi.org/10.1007/978-1-4613-0021-2_13.

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Yamazaki, Miki, Susumu Iwamoto, and Kenji Seiwa. "Distance- and density-dependent seedling mortality caused by several diseases in eight tree species co-occurring in a temperate forest." In Forest Ecology. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-90-481-2795-5_14.

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Bigras, Francine J., Aija Ryyppö, Anders Lindström, and Eva Stattin. "Cold Acclimation and Deacclimation of Shoots and Roots of Conifer Seedlings." In Tree Physiology. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9650-3_3.

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Kitajima, Kaoru. "Ecophysiology of Tropical Tree Seedlings." In Tropical Forest Plant Ecophysiology. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1163-8_19.

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Colombo, Stephen J., Michael I. Menzies, and Conor O’Reilly. "Influence of Nursery Cultural Practices on Cold Hardiness of Coniferous Forest Tree Seedlings." In Tree Physiology. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9650-3_9.

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Eldhuset, T., A. Göransson, and T. Ingestad. "Aluminum Toxicity in Forest Tree Seedlings." In Effects of Atmospheric Pollutants on Forests, Wetlands and Agricultural Ecosystems. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70874-9_29.

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Conference papers on the topic "Tree seedling"

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DUMINS, Karlis, Toms STALS, and Dagnija LAZDINA. "FOREST REGENERATION QUALITY ASSESSMENT BY ASTA SYSTEM." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.178.

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In Latvia one third of the total forest area is regenerated by planting tree seedlings and therefore it is important to choose the appropriate soil preparation method and the right type of regeneration material for each forest type. Usually the success of afforestation is evaluated by how high is the average seedling survival rate and growth parameters like height, annual increment, diameter at breast height while the location of the seedling is disregarded. This may be of great importance since in such stands the environmental conditions typically are not entirely homogenous. Micro topography differences impact seedling growth, because it modifies water regime, temperature, micronutrient availability, sun radiation and other factors. Therefore, aim of this work is to improve monitoring methods and determine the most efficient soil preparation and seedling preparation combination to improve the quality of forest regeneration. That could be done using ASTA documentation system originally developed to show seedling and mound location and density in planting area during mechanic planting. But it also allows to link the precise location of the seedling and growing conditions with its growing rate and survival and therefore it is easier to exclude seedlings that are affected by other factors than those that you are interested in, so you can gain more representative results. This also could be used in forest management. When using ASTA system it is also possible to display how different tree disease are distributed in the stand, if they have spread eventually or localized only in some parts of the stand, also it can be used for browsing and other tree damage monitoring in the stand. In conclusion: in harsh environmental conditions on unprepared forest soil and soil prepared in furrows made by disc trench larger seedlings show better survival rate. Survival of seedlings is significantly impacted by micro topography, whereas mounded micro sites equalize local environmental conditions that reduce impact of micro topography.
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Wanasinghe, Thumeera R., Benjamin Robert Dowden, Oscar De Silva, George K. I. Mann, and Cyril Lundrigan. "Automated Seedling Height Assessment for Tree Nurseries Using Point Cloud Processing." In 2019 International Conference on Robotics and Automation (ICRA). IEEE, 2019. http://dx.doi.org/10.1109/icra.2019.8793790.

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Zhou, T. T., L. Xue, and Z. M. Wang. "Photosynthetic response of greening seedling of four tree species to low temperature stress." In 2015 International Conference on Food Hygiene, Agriculture and Animal Science. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813100374_0024.

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Kobayashi, Felipe Kawashita, Andrea Britto Mattos, Maysa M. G. Macedo, and Bruno H. Gemignani. "Citrus Tree Classification from UAV Images: Analysis and Experimental Results." In XV Workshop de Visão Computacional. Sociedade Brasileira de Computação - SBC, 2019. http://dx.doi.org/10.5753/wvc.2019.7624.

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The use of unmanned aerial vehicles (UAVs) and computer vision for automating farm operations is growing rapidly: time-consuming tasks such as crop monitoring may be solved in a more efficient, precise, and less error-prone manner. In particular, for estimating productivity and managing pests, it is fundamental to characterize crop regions into four classes: (i) full-grown trees, (ii) tree seedlings, (iii) tree gaps, and (iv) background. In this paper, we address the classification of images from citrus plantations, acquired by UAVs, into the previously mentioned categories. While Deep learning-based methods allow to achieve high accuracy values for classification, explainability remains an issue. Therefore, our approach is to run an experimental analysis that allows to derive the effects of different parametrizations (involving descriptors, classifiers, and sampling methods) when applied to our citrus dataset.
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MIEZĪTE, Olga, Jeļena RŪBA, Lāsma FREIMANE, Imants LIEPA, and Edgars DUBROVSKIS. "THE HEALTH STATUS AND NATURAL REGENERATION OF PINUS SYLVESTRIS L. AFTER THE SURFACE FIRE IN VACCINIOSA FOREST TYPE IN LATVIA." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.100.

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From abiotic factors the most effecting influence on forest ecosystems has fire. Two years after surface fire in the pine stands growing in Vacciniosa forest type. Two PL (hereinafter PL) were installed in medium-aged (49 years old, 2.3 ha) and two PLs - in maturing (96 years old, 2.5 ha) stands. In each PL (20x20 m), the numbering of the trees was carried out and their placement was fixed, as well as the diameter, height and height of the green crown were measured. The sanitary condition of each tree was evaluated. For registration of one-year and two-year seedlings in each sample plot 25 sampling units (1 m2) were used. The similar sampling units were used for evaluation of ground cover (5 in each PL diagonally arranged), the obtained samples were weighed. The purpose of the study was to analyze the health status and natural regeneration of P.sylvestris after the surface fire. The ground vegetation was completely burned out in the medium-aged stand, but in the maturing stand both ground vegetation and organic layer - mosaically. The average burning height of trees in the medium-aged forest stand was 0.6±0.64 m, in the maturing stand - at 2.3±0.34 m. The natural regeneration was not detected in the first year after surface fire in the medium-aged forest (only 58800 one-year seedlings were recorded at the second year after fire), while in the maturing stand it was at this time (46600 one-year and 14200 two-year seedlings). Insect damage and cracked bark was not detected.
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KEMESIUS, Martynas, Gerda SILINGIENE, Regina VASINAUSKIENE, and Remigijus ZALKAUSKAS. "THE INFLUENCE OF SEWAGE SLUDGE ON NORWAY SPRUCE (PICEA ABIES (L.) H. KARST.) SEEDLINGS GROWTH." In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.079.

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The usage of biodegradable waste as sewage sludge in a proper way for tree nurseries enable to seek for ecological, waste-less, alternative to mineral fertilization farming ways. The aim of this research is to investigate impact of sewage sludge fertilizers on Norway spruce (Picea abies) two years’ seedlings growth. Research has been done in 2013-2014 at Utena State Forest Enterprise nursery. The different fertilization rates (20, 40, 60, 80, 100 t/ha) of sewage sludge were investigated and compared with control – traditional fertilization with mineral fertilizers. The impact of sewage sludge was evaluated by seedlings biometric indicators, also dry mass of sample seedlings (medium seedlings by height and diameter). The bigger rates of sewage sludge showed almost better results in exception of seeds outlet. Sewage sludge has long lasting effect on seedlings growth and could successfully shift soil fertilization by mineral fertilizers. The obtained research results confirm the similar research carried out in 2011 in Rokiskis State Forest Enterprise nursery for first year Norway Spruce seedlings.
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PTACH, Wiesław, Ariel ŁANGOWSKI, Roman ROLBIECKI, et al. "THE INFLUENCE OF IRRIGATION ON THE GROWTH OF PAULOWNIA TREES AT THE FIRST YEAR OF CULTIVATION IN A LIGHT SOIL." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.121.

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The field experiment was carried out in 2016 on sandy soil in the forest nursery Białe-Błota (Bydgoszcz Forest Division, Poland). The effect of sprinkler irrigation on the growth Paulownia Shan Tong trees was investigated. The experiment was established as one factorial. The variability factor was the irrigation: S-sprinkler irrigation and C- without irrigation (control). The process included the controls of growth parameters: tree height, trunk diameter, number and surface of leaves. It was found that the sprinkled seedlings of Paulownia Shan Tong were significantly higher than those growing in the non-irrigated plots. The sprinkler irrigation applied in the experiment resulted in an increase in the number of leaves of the Paulownia and their surface area, which resulted in an increase in biomass yield. By analysing the results of the study on trunk diameter, leaf number and surface, it may be stated that irrigation watering significantly influenced the tested parameters. Irrigation significantly increased the height of Paulownia trees. The positive effect of the usage of sprinkler irrigation may indicate the possibility of effective application of this method in the field cultivation of Paulownia Shan Tong.
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Yang, Baoyi, Tonggao Sun, Hongyue Chen, et al. "Effects of Hydrogen Fluoride-stress on Physiological Characteristics of Theaceae Tree Seedlings." In International Conference on Education, Management and Computing Technology (ICEMCT-15). Atlantis Press, 2015. http://dx.doi.org/10.2991/icemct-15.2015.365.

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Sokolova, V. V., and E. M. Gusev. "The state of Ginkgo biloba L. in Moscow." In Растениеводство и луговодство. Тимирязевская сельскохозяйственная академия, 2020. http://dx.doi.org/10.26897/978-5-9675-1762-4-2020-152.

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The plantings of ginkgo biloba in Moscow were examined. Trees were studied in courtyards, at children's and educational institutions, in parks and botanical gardens of the city. Ginkgo trees and young seedlings are generally in good condition, with in some cases minor bark damage, few dry branches in the crowns and a slope of the trunk. Conclusions are made about the advisability of further study and reproduction of a valuable relict plant for medical purposes and for gardening.
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Wang, Zhuomin, Jianxin Xu, Li Xue, and Tongtong Zhou. "Effects of Low Temperature Stress and Release on Photosynthetic Indexes of Greening Seedlings of Three Tree Species." In International Conference on Advances in Energy, Environment and Chemical Engineering. Atlantis Press, 2015. http://dx.doi.org/10.2991/aeece-15.2015.135.

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Reports on the topic "Tree seedling"

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Devine, Warren D., and Constance A. Harrington. Influence of four tree shelter types on microclimate and seedling performance of Oregon white oak and western redcedar. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2008. http://dx.doi.org/10.2737/pnw-rp-576.

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Walters, Russell S., and Russell S. Walters. Protecting red oak seedlings with tree shelters in northwestern Pennsylvania. U.S. Department of Agriculture, Forest Service, North Central Research Station, 1993. http://dx.doi.org/10.2737/ne-rp-679.

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Nelson, E., and V. Rogers. Survival of planted tupelo seedlings in F- and H-Area tree-kill zones. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/67714.

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Leis, Sherry. Vegetation community monitoring at Lincoln Boyhood National Memorial: 2011–2019. National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2284711.

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Lincoln Boyhood National Memorial celebrates the lives of the Lincoln family including the final resting place of Abraham’s mother, Nancy Hanks Lincoln. Lincoln’s childhood in Indiana was a formative time in the life our 16th president. When the Lincoln family arrived in Indiana, the property was covered in the oak-hickory forest type. They cleared land to create their homestead and farm. Later, designers of the memorial felt that it was important to restore woodlands to the site. The woodlands would help visitors visualize the challenges the Lincoln family faced in establishing and maintaining their homestead. Some stands of woodland may have remained, but significant restoration efforts included extensive tree planting. The Heartland Inventory and Monitoring Network began monitoring the woodland in 2011 with repeat visits every four years. These monitoring efforts provide a window into the composition and structure of the wood-lands. We measure both overstory trees and the ground flora within four permanently located plots. At these permanent plots, we record each species, foliar cover estimates of ground flora, diameter at breast height of midstory and overstory trees, and tree regeneration frequency (tree seedlings and saplings). The forest species composition was relatively consistent over the three monitoring events. Climatic conditions measured by the Palmer Drought Severity Index indicated mild to wet conditions over the monitoring record. Canopy closure continued to indicate a forest structure with a closed canopy. Large trees (&gt;45 cm DBH) comprised the greatest amount of tree basal area. Sugar maple was observed to have the greatest basal area and density of the 23 tree species observed. The oaks characteristic of the early woodlands were present, but less dominant. Although one hickory species was present, it was in very low abundance. Of the 17 tree species recorded in the regeneration layer, three species were most abundant through time: sugar maple (Acer saccharum), red bud (Cercis canadensis), and ash (Fraxinus sp.). Ash recruitment seemed to increase over prior years and maple saplings transitioned to larger size classes. Ground flora diversity was similar through time, but alpha and gamma diversity were slightly greater in 2019. Percent cover by plant guild varied through time with native woody plants and forbs having the greatest abundance. Nonnative plants were also an important part of the ground flora composition. Common periwinkle (Vinca minor) and Japanese honeysuckle (Lonicera japonica) continued to be the most abundant nonnative species, but these two species were less abundant in 2019 than 2011. Unvegetated ground cover was high (mean = 95%) and increased by 17% since 2011. Bare ground increased from less than 1% in 2011 to 9% in 2019, but other ground cover elements were similar to prior years. In 2019, we quantified observer error by double sampling two plots within three of the monitoring sites. We found total pseudoturnover to be about 29% (i.e., 29% of the species records differed between observers due to observer error). This 29% pseudoturnover rate was almost 50% greater than our goal of 20% pseudoturnover. The majority of the error was attributed to observers overlooking species. Plot frame relocation error likely contributed as well but we were unable to separate it from overlooking error with our design.
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Thuan, V. V., C. Harwood, V. D. Toan, D. D. Lan, L. Nguyen, and S. Carsan. Growth and fruit yield of seedlings, cuttings and grafts from selected son tra trees in Northwest Vietnam. World Agroforestry Centre (ICRAF), 2016. http://dx.doi.org/10.5716/wp16046.pdf.

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Perkins, Dustin. Invasive exotic plant monitoring at Colorado National Monument: 2019 field season. Edited by Alice Wondrak Biel. National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2286650.

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Invasive exotic plant (IEP) species are a significant threat to natural ecosystem integrity and biodiversity, and controlling them is a high priority for the National Park Service. The North-ern Colorado Plateau Network (NCPN) selected the early detection of IEPs as one of 11 monitoring protocols to be implemented as part of its long-term monitoring program. This report represents work completed at Colorado National Monument during 2019. During monitoring conducted June 12–19, a total of 20 IEP species were detected on monitoring routes and transects. Of these, 12 were priority species that accounted for 791 separate IEP patches. IEPs were most prevalent along riparian areas. Yellow sweetclover (Melilotis officinale) and yellow salsify (Tragopogon dubius) were the most commonly detected priority IEPs along monitoring routes, representing 73% of all priority patches. Patches of less than 40 m2 were typical of nearly all priority IEP species except yellow sweetclover. A patch management index (PMI) was created by combining patch size class and percent cover for each patch. In 2019, a large majority of priority IEP patches were assigned a PMI score of low (46%) or very low (50%), indicating small and/or sparse patches where control is generally still feasible. This is similar to the numbers for 2017, when 99% of patches scored low or very low in PMI. Seventy-eight percent of tree patches were classified as seedlings or saplings, which require less effort to control than mature trees. Cheatgrass (Anisantha tectorum) was the most common IEP recorded in transects, found in 30–77% of transects across the different routes. It was the only species found in transects on all monitoring routes. When treated and untreated extra areas near the West Entrance were compared, the treated area had comparable or higher lev-els of IEPs than the untreated area. When segments of monitoring routes conducted between 2003 and 2019 were compared, results were mixed, due to the different species monitored in different time periods. But in general, the number of IEPs per 100 meters is increasing or remaining constant over time. There were notable increases in IEP patches per 100 meters on several routes in 2019: field bindweed (Convolvulus arvensis) along East Glade Park Road; Siberian elm (Ulmus pumila) in Red Canyon; yellow salsify along East Glade Park Road, No Thoroughfare Canyon, No Thoroughfare Trail, and Red Canyon; and yellow sweetclover in No Thoroughfare Canyon and Red Canyon. Network staff will return to re-sample monitoring routes in 2021.
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