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Journal articles on the topic 'Seedling ecology'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Herr, DG, LC Duchesne, R. Tellier, RS Mcalpine, and RL Peterson. "Effect of Prescribed Burning on the Ectomycorrhizal Infectivity of a Forest Soil." International Journal of Wildland Fire 4, no. 2 (1994): 95. http://dx.doi.org/10.1071/wf9940095.

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Ectomycorrhizae formation, seedling health index, and seedling survival were assessed for two-year-old nursery-grown seedlings of Pinus resinosa and Pinus strobus two months after planting in clear-cuts that had received prescribed burning under different fire intensities. Controls consisted of seedlings planted in unburned clear-cuts. Fire intensity positively correlated with percent ectomycorrhizal roots for P. strobus but not for P. resinosa. Seedling health index and survival were highest in burned-over sites as compared to control sites for both pine species. Fire intensity correlated wit

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2

Zhang, Jianhua, and M. A. Maun. "Effects of partial removal of seed reserves on some aspects of seedling ecology of seven dune species." Canadian Journal of Botany 69, no. 7 (1991): 1457–62. http://dx.doi.org/10.1139/b91-188.

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Greenhouse studies were conducted to determine the effects of partial removal of endosperm or cotyledons from seeds of seven dune species on seed germination, seedling emergence, seedling size, and dry matter allocation. Different proportions (0, 30, and 60%) were surgically removed from seeds of Agropyron psammophilum, Calamovilfa longifolia, Elymus canadensis, Leymus arenarius, Panicum virgatum, Lupinus perennis, and Strophostyles helvola. Partial removal of seed reserves caused a significant reduction in seedling variables 1 or 2 weeks after planting in sand. For example, seedling height, l

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3

Saito, Waka, Koji Kawamura, and Hiroshi Takeda. "Relative importance of overstory canopy openness and seedling density on crown morphology and growth of Acer nipponicum seedlings." Botany 90, no. 11 (2012): 1152–60. http://dx.doi.org/10.1139/b2012-079.

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We investigated the effects of overstory canopy openness and seedling density on seedling morphology and growth in the mid-successional species Acer nipponicum Hara in a cool-temperate forest. Studied seedlings were 46 seedlings of 30–160 cm height, and their overstory canopy openness ranged between 7.2% and 17.0%. Seedling density, measured as the number of conspecific neighboring seedlings within a 50 cm radius of the target seedling, ranged between 0 and 19. There were no significant correlations between seedling height, canopy openness, and seedling density. Multiple regression analysis sh

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4

Duchesneau, Robin, and Hubert Morin. "Early seedling demography in balsam fir seedling banks." Canadian Journal of Forest Research 29, no. 10 (1999): 1502–9. http://dx.doi.org/10.1139/x99-090.

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Following the 1995 mast year, we conducted detailed seedling demography surveys to characterize some ecological factors affecting germination and early establishment in understory balsam fir (Abies balsamea (L.) Mill.) seedling banks and verify if recruitment from a cohort can potentially renew the balsam fir seedling bank. Twenty-five seed traps paired with 32 demography subplots were located in each of four permanent plots and regularly monitored over a 2-year period. Spatial patterns of newly emerged seedlings generally corresponded to those found for seed dispersal. However, at the end of

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5

Oka, Chihiro, Tomoyuki Itagaki, and Satoki Sakai. "Effects of the number of embryos in a seed and seed mass on seedling survival and growth in polyembryonic Ophiopogon japonicus var. umbrosus (Asparagaceae)." Botany 94, no. 4 (2016): 261–68. http://dx.doi.org/10.1139/cjb-2015-0214.

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Research on polyembryony suggests that the presence of multiple embryos in a seed confers an advantage for seedling survival. Because observations from embryo to seedling stages are lacking, however, the effect of the exact number of embryos on seedling survival is unclear. In this study, we evaluated the effect of seed embryo number on seedling survival and growth to determine the number of embryos in a seed that are advantageous for seedling survival in Ophiopogon japonicus (Thunb.) Ker Gawl. var. umbrosus Maxim., which is a taxon exhibiting cleavage polyembryony. We also investigated whethe

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6

Bolfrey-Arku, Grace E.-K., Bhagirath S. Chauhan, and David E. Johnson. "Seed Germination Ecology of Itchgrass (Rottboellia cochinchinensis)." Weed Science 59, no. 2 (2011): 182–87. http://dx.doi.org/10.1614/ws-d-10-00095.1.

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Itchgrass is a weed of many crops throughout the tropics and one of the most important grass weeds of rainfed rice. Experiments were conducted in the laboratory and screenhouse to determine the effects of light, alternating day/night temperatures, high temperature pretreatment, water stress, seed burial depth, and rice residue on seed germination and seedling emergence of itchgrass in the Philippines. Two populations were evaluated and the results were consistent for both populations. Germination in the light/dark regime was greater at alternating day/night temperatures of 25/15 C than at 35/2

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Khurana, Ekta, and J. S. Singh. "Ecology of seed and seedling growth for conservation and restoration of tropical dry forest : a review." Environmental Conservation 28, no. 1 (2001): 39–52. http://dx.doi.org/10.1017/s0376892901000042.

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Dry forests are among the most threatened ecosystems and have been extensively converted into grasslands, secondary forest, savanna or agricultural land. Knowledge of seed germination and seedling establishment is required for the success of efforts on restoration of these forests. This review focuses on the ecological requirements at seed and seedling stages, and collates the current knowledge of seed viability, dormancy, germination pattern and seedling behaviour of dry tropical tree species. The spatio-temporal variations within the tropical dry forest biome in soil moisture, light, tempera

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8

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 obscu

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9

Chauhan, Bhagirath S., and David E. Johnson. "Germination Ecology of Goosegrass (Eleusine indica): An Important Grass Weed of Rainfed Rice." Weed Science 56, no. 5 (2008): 699–706. http://dx.doi.org/10.1614/ws-08-048.1.

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Goosegrass is considered one of the most important grassy weeds of rice, particularly in rain-fed environments. Experiments were conducted in laboratory, screenhouse, and field to study the germination ecology of goosegrass seeds. In the laboratory, germination was greater at higher alternating temperatures (30/20 and 35/25 C) than at the lowest alternating temperatures (25/15 C). An after-ripening period of at least 3 mo was required to improve the germination of goosegrass. Germination was tolerant of salt stress but sensitive to a high degree of water stress. A pH range of 5 to 10 did not i

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Blenis, Peter V., Kathleen L. Wiggins, James E. Cunningham, and Michael A. Pickard. "Maltol protects against infection of lodgepole pine seedlings by western gall rust." Canadian Journal of Forest Research 18, no. 12 (1988): 1658–60. http://dx.doi.org/10.1139/x88-252.

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Uptake and translocation of maltol into 6-week-old Pinusconforta (Engelm.) var. latifolia seedlings was followed by means of gas chromatography. Maltol concentrations of 6.0–7.3 mg/g seedling dry weight (46–55 μg/seedling) were observed over the first 3 days following a single application of 50 mg maltol/seedling. A split-plot design was used to determine if maltol could reduce seedling infection by Endocronartiumharknessii. Whole plots consisted of two inoculum levels (7 or 30 mg of spores per tray of seedlings) and subplots consisted of four levels of maltol (0, 2, 10, or 40 mg/mL) applied 2

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Bauk, Karen, Reyes Pérez-Sánchez, Sebastián R. Zeballos, M. Laura Las Peñas, Joel Flores, and Diego E. Gurvich. "Are seed mass and seedling size and shape related to altitude? Evidence in Gymnocalycium monvillei (Cactaceae)." Botany 93, no. 8 (2015): 529–33. http://dx.doi.org/10.1139/cjb-2015-0026.

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Several studies reported a negative relationship between altitude and seed mass. In cactus species, seed mass has been also related to seedling morphology (size and shape). Here we studied Gymnocalycium monvillei (Lem.) Pfeiff. ex Britton & Rose, a cactus species with a wide altitudinal distribution, with the main aim of analyzing how altitude affects seed mass and seedling size (height and width) and shape (globose or columnar). We collected seeds from five sites along the entire altitudinal distribution of the species in the Córdoba Mountains (sites were located between 878 and 2230 m a.

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Comeau, Philip G., Thomas F. Braumandl, and Chang-Yi Xie. "Effects of overtopping vegetation on light availability and growth of Engelmann spruce (Piceaengelmannii) seedlings." Canadian Journal of Forest Research 23, no. 10 (1993): 2044–48. http://dx.doi.org/10.1139/x93-255.

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To examine the effects of overtopping vegetation on solar irradiance reaching Engelmann spruce (Piceaengelmannii Parry) seedlings and on crop seedling performance, neighborhood studies were established at six sites in mixed shrub–herb and fireweed communities of the Interior Cedar–Hemlock zone of southern British Columbia. These communities were dominated by mixtures of fireweed (Epilobiumangustifolium L.), thimbleberry (Rubusparviflorus Nutt.), red raspberry (Rubusidaeus L.), and (or) bracken fern (Pteridiumaquilinum (L.) Kuhn). Three hundred and eighty-eight planted Engelmann spruce seedling

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13

Yücedağ, Cengiz, Nebi Bilir, and Halil Barış Özel. "Phytohormone effect on seedling quality in Hungarian oak." Forest Systems 28, no. 2 (2019): e005. http://dx.doi.org/10.5424/fs/2019282-14604.

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Aim of study: to find out the effects of four phytohormones, including Indole Butyric Acid (IBA), Indole Acetic Acid (IAA), and Gibberellic acids (GA3, GA4) on seedling growth of Hungarian oak which has a natural distribution in the northwestern of Turkey.Area of Study: Mature acorns of Hungarian oak were collected from a natural stand in Zonguldak-Ereğli at northwestern region of Turkey.Material and Methods: Collected acorns of the species were pretreated with 300 ppm of each phytohormone for 24 hours and sown in Yenihan State Forest Nursery of Bartin, Turkey. Two years old bare-root seedling

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Cline, E., B. Vinyard, and R. Edmonds. "Spatial effects of retention trees on mycorrhizas and biomass of Douglas-fir seedlings." Canadian Journal of Forest Research 37, no. 2 (2007): 430–38. http://dx.doi.org/10.1139/x06-229.

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Retention forestry places seedlings in proximity to residual trees, exposing seedlings to additional sources of ectomycorrhizal fungus (EMF) inoculum. To investigate this, Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) seedlings were planted near (2–6 m) and far (16–30 m) from 44- to 72-year-old residual Douglas-fir trees in western Washington, USA. From 1998 through 2000, seedling shoot and root biomass was assessed and EMF taxa were identified using morphology and sequence analysis of internal transcribed spacer and large subunit ribosomal RNA genes. Seedlings near residual trees had si

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15

Benítez-Malvido, Julieta, Miguel Martínez-Ramos, José Luis C. Camargo, and Isolde D. K. Ferraz. "Responses of seedling transplants to environmental variations in contrasting habitats of Central Amazonia." Journal of Tropical Ecology 21, no. 4 (2005): 397–406. http://dx.doi.org/10.1017/s0266467405002439.

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In the Central Amazon we investigated whether seedling performance (survival, and relative growth rates in height and leaf numbers) was affected by initial seedling size (height and leaf numbers) in habitats that varied in their degree of human disturbance: cattle pasture, young secondary forest, 1-ha forest fragment and old-growth forest. Additionally, effects of photosynthetically active radiation (PAR), litter standing crop (LSC) and insect herbivory were evaluated 12 mo after transplantation in seedlings from the native canopy trees Chrysophyllum pomiferum, Micropholis venulosa and Pouteri

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16

Nguyen, Chi D., Jianjun Chen, David Clark, Hector Perez, and Heqiang (Alfred) Huo. "Effects of Maternal Environment on Seed Germination and Seedling Vigor of Petunia × hybrida under Different Abiotic Stresses." Plants 10, no. 3 (2021): 581. http://dx.doi.org/10.3390/plants10030581.

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Seed germination and seedling vigor can be affected by environmental cues experienced by the mother plant. However, information about how the maternal environment affects seed quality is scarce in ornamental plants. This study aimed to investigate the effects of two different maternal environments on the seed germination and seedling vigor of Petunia × hybrida under a variety of abiotic stresses. Petunia mother plants were grown in either a greenhouse during the summer months or an indoor controlled-temperature-and-light environment. Collected seeds were subjected to external stressors, includ

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17

McCreary, Douglas D., and Joe B. Zaerr. "Root respiration has limited value for assessing Douglas-fir seedling quality." Canadian Journal of Forest Research 17, no. 9 (1987): 1144–47. http://dx.doi.org/10.1139/x87-175.

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Root damage is a principal cause of poor seedling quality. Currently, the most widely used seedling-quality test measures a seedling's ability to initiate and elongate roots in a favorable environment; however, this test requires a lengthy response period and tedious, time-consuming measurements. Alternatively, the respiration rate of roots could be measured much more quickly and easily. Results of this study, which examined whether root respiration could successfully predict the survival and growth of potted Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings in a growth room, indicat

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Arrieta, S., and F. Suárez. "Seedling diversity and spatially related regenaration dynamics in holly woodlands and surrounding habitats." Web Ecology 2, no. 1 (2001): 38–46. http://dx.doi.org/10.5194/we-2-38-2001.

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Abstract. Spatial patterns of seedling distribution and diversity were analysed in small fragments of holly Ilex aquifolium L. woodlands and in their surrounding areas. Two sampling locations with similar structure were selected for this study: Oncala and Robregordo. They consist of nearly monospecific Ilex stands surrounded by grasslands with high scrub abundance. The seedling appearance of woody species was quantified from March to November 1998. Sampled areas were: 1) closed holly canopy; 2) open holly canopy or small forest gaps; 3) holly woodland edge; 4) surrounding grassland; 5) under i

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Distel, RA, DV Pelae, and OA Fernandez. "Germination of Piptochaetium Napostaense (Speg.) Hackel and Stipa Tenuis Phil. And Seedling Survival Under Field Conditions." Rangeland Journal 14, no. 1 (1992): 49. http://dx.doi.org/10.1071/rj9920049.

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The objectives of this work were to investigate the germination of Piptochaetium napostaense and Stipa tenuis under laboratory conditions and to evaluate the effects of different plant canopy cover on seedling emergence and survival of the two species in the field. Fresh seeds of both species present a high level of dormancy associated with the lemma and palea, preventing seedling emergence immediately after the seeds fall in NovemberPecember. Seventy per cent of the seedlings of both species emerged in autumn. The germination behavior of these grass species may be an ecological adaptation ser

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Morgan, JW. "Ecological Studies of the Endangered Rutidosis leptorrhynchoides. II. Patterns of Seedling Emergence and Survival in a Native Grassland." Australian Journal of Botany 43, no. 1 (1995): 13. http://dx.doi.org/10.1071/bt9950013.

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The emergence, survival and growth of seedlings of the endangered Rutidosis leptorrhynchoides F.Muell. were followed in a Themeda triandra grassland during 1991 and 1992. The effect of summer irrigation on seedling survival was also investigated. Seedling emergence occurred in both years within 2 weeks of the 'autumn break' when soil moisture rose above 20%. Ninety percent of emergence was observed within 4 weeks of the onset of germination and 87% of seedlings were within 20 cm of an established plant. No emergence was observed after 8 weeks. Thirteen percent of the 1991 cohort survived for 1

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Egnell, Gustaf, and Göran Örlander. "Using infrared thermography to assess viability of Pinussylvestris and Piceaabies seedlings before planting." Canadian Journal of Forest Research 23, no. 9 (1993): 1737–43. http://dx.doi.org/10.1139/x93-219.

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One-year-old Scots pine (Pinussylvestris L.) and 2-year-old Norway spruce (Piceaabies (L.) Karst.) seedlings were lifted and stored under an array of conditions to test infrared thermography as a means of determining seedling viability. After winter storage, temperature was measured on each seedling with an infrared thermovision scanner (3–5 μm) in an environment favoring transpiration (vapor pressure deficit of the ambient air 1.6–2.9 kPa, photosynthetic photon flux density 1500 μmol•m−2•s−1). Thereafter the seedlings were planted in the field. Visual signs of damage were assessed and annual

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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 dis

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Bellingham, P. J., and S. J. Richardson. "Tree seedling growth and survival over 6 years across different microsites in a temperate rain forest." Canadian Journal of Forest Research 36, no. 4 (2006): 910–18. http://dx.doi.org/10.1139/x05-308.

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We investigated whether canopy tree seedlings have different growth and mortality rates on different microsites in montane rain forests of the western South Island, New Zealand. Seedling relative height growth rates of three species, Podocarpus hallii, Quintinia acutifolia, and Weinmannia racemosa, were very low (mean = 0.037 cm·cm–1·year–1). Seedling growth rates were higher on logs than on the ground at high light levels, but the probability of seedling death on logs was also greater at high light levels. Seedling foliar N and P concentrations were generally not different between logs and th

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Marx, Laura M., and Michael B. Walters. "Effects of nitrogen supply and wood species on Tsuga canadensis and Betula alleghaniensis seedling growth on decaying wood." Canadian Journal of Forest Research 36, no. 11 (2006): 2873–84. http://dx.doi.org/10.1139/x06-171.

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Eastern hemlock (Tsuga canadensis (L.) Carrière) and yellow birch (Betula alleghaniensis Britt.) in primary Michigan forests depend on decaying wood for seedling-establishment sites, but seedling densities vary across wood species (hemlock, yellow birch, and sugar maple (Acer saccharum Marsh.)). We collected seedlings and wood from a natural field experiment and conducted a companion greenhouse experiment to determine whether seedling mass and nitrogen (N) content varied with wood species and whether they were related to wood inorganic N supply. Yellow birch seedlings were largest on hemlock w

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South, David B., and Robert J. Mitchell. "Determining the "optimum" slash pine seedling size for use with four levels of vegetation management on a flatwoods site in Georgia, U.S.A." Canadian Journal of Forest Research 29, no. 7 (1999): 1039–46. http://dx.doi.org/10.1139/x99-048.

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A slash pine (Pinus elliottii Engelm. var elliottii) study was established to determine the "optimum" seedling size for use on a flatwoods site in the Coastal Plain physiographic province of Georgia, U.S.A. The optimum seedling is defined as the ideotype that will minimize overall reforestation costs while achieving established goals for initial survival and growth. Initial survival and fourth-year performance were examined in relation to (i) method of site preparation, (ii) herbicide application, and (iii) seedling class (based on root-collar diameter) and to associated establishment costs. S

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Ellison, Aaron M., Julie Sloan Denslow, and Bette A. Loiselle. "Seed and Seedling Ecology of Neotropical Melastomataceae." Ecology 74, no. 6 (1993): 1733–49. http://dx.doi.org/10.2307/1939932.

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Johnsen, Kurt H. "Growth and ecophysiological responses of black spruce seedlings to elevated CO2 under varied water and nutrient additions." Canadian Journal of Forest Research 23, no. 6 (1993): 1033–42. http://dx.doi.org/10.1139/x93-132.

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Two controlled-environment studies examined growth and ecophysiological responses of black spruce (Piceamariana (Mill.) B.S.P.) seedlings to elevated CO2 under varied water and nutrient additions. Growth analyses were conducted followed by measurements of gas exchange, xylem pressure potential and foliar N concentrations. Growth under elevated CO2 (700 ppm) increased final seedling dry weights by 20–48% compared with seedling growth under ambient CO2 (350 ppm). Percent increases in seedling dry weight were greater under drought versus well-watered conditions and higher versus lower nutrient ad

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Tobe, Kazuo, Xiaoming Li, and Kenji Omasa. "Effects of irrigation on seedling emergence and seedling survival of a desert shrub Haloxylon ammodendron (Chenopodiaceae)." Australian Journal of Botany 53, no. 6 (2005): 529. http://dx.doi.org/10.1071/bt04210.

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Haloxylon ammodendron (C.A. Mey) Bunge (Chenopodiaceae) is a shrub occurring on desert sand dunes in China. Seedling emergence and seedling survival were investigated by sowing seeds at different depths (0, 2.5, 5.0 or 10 mm) in fine or coarse sand in pots irrigated under different regimes. Seed burial in sand was required for seedling establishment of this species. Seedling emergence depended greatly on seed burial depth, sand type, and irrigation regime; this appeared to be due to (1) seeds or seedlings suffering from oxygen or moisture deficiency depending on the air : moisture ratio in san

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Lieffers, Victor J., S. Ellen Macdonald, and Edward H. Hogg. "Ecology of and control strategies for Calamagrostiscanadensis in boreal forest sites." Canadian Journal of Forest Research 23, no. 10 (1993): 2070–77. http://dx.doi.org/10.1139/x93-258.

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Calamagrostiscanadensis (Michx.) Beauv. is a widely distributed rhizomatous grass that can seriously inhibit growth of white spruce (Piceaglauca (Moench) Voss) seedlings in the boreal forests of North America. We review the dynamics of this grass during four successional stages: the colonization of disturbed sites; dominance of the site by the grass a few years after disturbance; gradual loss of dominance with overstory development; and maintenance of the grass at low levels in the understory of the mature forest. We also describe C. canadensis in relation to recruitment from clonal growth and

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Zárate, Diego A., Ellen Andresen, and Carolina Santos-Heredia. "Seed fate and seedling recruitment in monkey latrines in rustic cocoa plantations and rain forest in southern Mexico." Journal of Tropical Ecology 35, no. 1 (2018): 18–25. http://dx.doi.org/10.1017/s026646741800041x.

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AbstractPrimates are important seed dispersers in natural ecosystems and agro-ecosystems, but the latter scenario remains under-studied. The degree to which primates favour plant regeneration greatly depends on post-dispersal processes. The main objective of this study was to compare patterns of seed/seedling fate and seedling recruitment in two habitats of the black howler monkey (Alouatta pigra Lawrence 1933), rustic cocoa and rain forest, and two types of seed-deposition locations, monkey latrines and control locations. Field experiments were carried out within the non-overlapping home rang

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Cleavitt, Natalie L., Timothy J. Fahey, and John J. Battles. "Regeneration ecology of sugar maple (Acer saccharum): seedling survival in relation to nutrition, site factors, and damage by insects and pathogens." Canadian Journal of Forest Research 41, no. 2 (2011): 235–44. http://dx.doi.org/10.1139/x10-210.

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The possible regeneration failure of sugar maple ( Acer saccharum Marsh.) as part of their decline has been not well explored using field studies. We sought to clarify the roles of maternal effects and dynamics of early-season survival in contributing to the previously documented pattern of larger seedlings and higher seedling densities on a Ca-treated watershed (CAL) at Hubbard Brook Experimental Forest. We used a reciprocal seed planting experiment at four sites, two sites per watershed blocked by elevation. Regardless of maternity, sugar maple seedlings planted in CAL had higher survival th

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Chauhan, Bhagirath S., and David E. Johnson. "Seed Germination Ecology of Junglerice (Echinochloa colona): A Major Weed of Rice." Weed Science 57, no. 3 (2009): 235–40. http://dx.doi.org/10.1614/ws-08-141.1.

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Junglerice is one of the most serious grass weeds of rice in the tropics. Experiments were conducted in the laboratory and screenhouse to determine the influence of environmental factors on seed germination and seedling emergence of junglerice in the Philippines. In the laboratory, germination was stimulated by light, suggesting that seeds of this species are positively photoblastic. The tested temperatures (35/25, 30/20, and 25/15 C alternating day/night temperatures), however, did not influence germination. Germination in the laboratory was not affected by a soil pH range of 4 to 9, but was

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Livingston, N. J., and T. A. Black. "The growth and water use of three species of conifer seedlings planted on a high-elevation south-facing clearcut." Canadian Journal of Forest Research 18, no. 10 (1988): 1234–42. http://dx.doi.org/10.1139/x88-190.

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Container-grown 1-0 seedlings of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), western hemlock (Tsugaheterophylla (Raf.) Sarg.), and Pacific silver fir (Abiesamabilis (Dougl.) Forbes) were spring planted on a south-facing high-elevation clearcut located on Mount Arrowsmith, Vancouver Island, British Columbia, and their growth and development was measured over three successive growing seasons. Treatments designed to modify seedling microclimate, including provision of shade cards, irrigation, and irrigation and shade cards combined, had a marked effect on the extent and type of growth in a

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Imo, Moses, and Victor R. Timmer. "Vector competition analysis of black spruce seedling responses to nutrient loading and vegetation control." Canadian Journal of Forest Research 29, no. 4 (1999): 474–86. http://dx.doi.org/10.1139/x99-020.

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Impacts of methods to overcome competing vegetation (fertilization, herbicide application, and shading) on conventional and nutrient-loaded black spruce (Picea mariana (Mill.) BSP) seedlings were examined on six forest site types in northeastern Ontario using vector competition analysis. Four sites (Alnus; hardwood; mixedwood, herb rich; and mixedwood, herb poor) were selected to represent high competition, and two sites (feathermoss and Vaccinium) to represent low-competition forest sites. Although similar in biomass before planting, loaded seedlings had greater N, P, and K content than nonlo

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Bal, Amandeep, and Christopher P. Chanway. "Evidence of nitrogen fixation in lodgepole pine inoculated with diazotrophic Paenibacillus polymyxa." Botany 90, no. 9 (2012): 891–96. http://dx.doi.org/10.1139/b2012-044.

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Diazotrophic bacteria previously isolated from internal tissues of naturally regenerating lodgepole pine ( Pinus contorta var. latifolia (Dougl.) Engelm.) seedlings were tested for their ability to colonize and fix nitrogen (N) in pine germinants in two experiments. Surface sterilized pine seed was sown in glass tubes containing an autoclaved sand – montmorillonite clay mixture that contained a N-limited nutrient solution labeled with 15N as 0.35 mmol·L–1 Ca(15NO3)2 (5% 15N label). Pine seed was inoculated with one of three of the following bacterial strains: Paenibacillus polymyxa P2b-2R, P.

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Latva-Karjanmaa, Tarja, Leena Suvanto, Kari Leinonen, and Hannu Rita. "Emergence and survival of Populus tremula seedlings under varying moisture conditions." Canadian Journal of Forest Research 33, no. 11 (2003): 2081–88. http://dx.doi.org/10.1139/x03-129.

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Aspen produces large numbers of seeds, even though it mainly reproduces asexually with root suckers. The aim of this study was to find out how different moisture conditions affect emergence and survival of Populus tremula L. seedlings. This was studied with a sowing experiment (totally randomized factorial design). There were altogether 10 blocks, each containing 16 microsites and three treatments (sowing time, watering, sowing shelter) replicated twice in each block. Seedlings emerged on 56% of microsites. Sowing time affected seedling emergence. Both the proportion of microsites with seedlin

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Blain, Dominique, and Martin Kellman. "The effect of water supply on tree seed germination and seedling survival in a tropical seasonal forest in Veracruz, Mexico." Journal of Tropical Ecology 7, no. 1 (1991): 69–83. http://dx.doi.org/10.1017/s0266467400005101.

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ABSTRACTIn Iropical seasonal forests, mass seedling death may incidentally occur early in the rainy season following untimely germination provoked by an isolated heavy rainfall. We hypothesized that, in a soil with little moisture retention capacity, irregular rainfall patterns would result in large fluctuations of water supply and, in the early wet season, drought episodes could cause seedling death. This hypothesis was tested in a seasonal tropical forest in Mexico where seedling density is low and the soil consists of almost pure sand with a low water retention capacity. Various patterns of

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Kunstler, Georges, Joël Chaduf, 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. pubes

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Tanner, E. V. J., V. K. Teo, D. A. Coomes, and J. J. Midgley. "Pair-wise competition-trials amongst seedlings of ten dipterocarp species; the role of initial height, growth rate and leaf attributes." Journal of Tropical Ecology 21, no. 3 (2005): 317–28. http://dx.doi.org/10.1017/s0266467405002269.

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To investigate whether seedlings of ten dipterocarp species differed significantly in terms of growth and mortality or whether species were not significantly different and could be considered ecologically similar, seedlings were grown, two per pot, in two experiments: (1) where the two seedlings were of equal height (30 cm); and (2) where one seedling was 10 cm shorter than the other. Seedlings were grown in a shade house with 15% above-canopy light in a 50:50 forest soil–sand mixture and were watered frequently; pots were placed so that seedling density was 130 seedlings m−2 of ground. In the

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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 growt

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Youngblood, Andrew P. "Effect of shelterwood removal methods on established regeneration in an Alaska white spruce stand." Canadian Journal of Forest Research 20, no. 9 (1990): 1378–81. http://dx.doi.org/10.1139/x90-182.

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Seedling damage during overstory removal was compared among different yarding methods; almost three times more mortality was associated with rubber-tired ground skidding than with skyline cable yarding. Seedlings ranging in height from 0.4 to 1.0 m generally received less damage or had lower mortality rates from cable yarding than did shorter or taller seedlings. Snowpack disturbance and percentage of seedling mortality were positively correlated. Results suggested that with attention to seedling height growth and yarding method, the shelterwood regeneration system is a viable option for white

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Domic, Alejandra I., José M. Capriles, and Gerardo R. Camilo. "Evaluating the fitness effects of seed size and maternal tree size on Polylepis tomentella (Rosaceae) seed germination and seedling performance." Journal of Tropical Ecology 36, no. 3 (2020): 115–22. http://dx.doi.org/10.1017/s0266467420000061.

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AbstractIn vascular plants, larger seeds are generally associated with higher germination potential, healthier seedlings and overall higher rates of survivorship. How this relationship holds or what other physiological tradeoffs evolved in plants adapted to high-altitude environments, such as the tropical and subtropical highland Polylepis tree, remain unclear. In this study, we evaluated the relationship between seed mass and seedling performance by testing the reserve effect, the metabolic effect, and the seedling-size effect hypotheses in Polylepis tomentella Weddell (Rosaceae). Since the r

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Sucoff, Edward, Cindy Buschena, and Perry Tamte. "Desiccation and water potentials in the roots, leaves, and shoots of bare-root red pine and white spruce." Canadian Journal of Forest Research 15, no. 5 (1985): 989–92. http://dx.doi.org/10.1139/x85-157.

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Bare-root seedlings of red pine (Pinusresinosa Ait.) and white spruce (Piceaglauca (Moench) Voss) were dried in various controlled situations before measurement of water potential (ψ) and moisture contents. For each situation, root ψ was directly proportional to and highly correlated with shoot ψ. The regression lines did not vary with environment for fully exposed seedlings within a seedling lot. Regressions did differ between seedling lots and between seedlings that had roots only, shoots only, or both roots and shoots exposed. Since the differences between root and shoot ψ were sometimes la

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Boltz, Brett A., Bruce C. Bongarten, and Robert O. Teskey. "Seasonal patterns of net photosynthesis of loblolly pine from diverse origins." Canadian Journal of Forest Research 16, no. 5 (1986): 1063–68. http://dx.doi.org/10.1139/x86-184.

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Growth and photosynthesis were examined in seedlings of Pinustaeda L. (loblolly pine) from six widely separated provenances. The seasonal patterns of net photosynthesis were similar for each. Seedling net photosynthesis peaked in late October and net photosynthesis per unit leaf area peaked before midsummer and again in late October. When averaged over the entire season, seedling photosynthesis was greatest for Florida seedlings and least for Arkansas–Oklahoma and Texas seedlings. Seedling photosynthesis was strongly correlated with final size on all sampling dates and when averaged over the e

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Coyle, David R., William J. Mattson, Alexander L. Friend, and Kenneth F. Raffa. "Effects of an invasive herbivore at the single plant scale do not extend to population-scale seedling dynamics." Canadian Journal of Forest Research 44, no. 1 (2014): 8–16. http://dx.doi.org/10.1139/cjfr-2013-0307.

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A complex of nine invasive weevils has established in the northern hardwood forests of the Great Lakes Region. These weevils have become the numerically dominant arthropod fauna in the lower vegetation strata of this ecosystem. Effects of these folivorous adults and rhizophagous larvae on seedling survival and density are unknown. We measured the impact of adult weevil defoliation on individual sugar maple (Acer saccharum Marshall) seedlings, the numerically dominant flora in these stands. Over 14 500 seedlings were measured to examine the effects of larval abundance, adult abundance, and adul

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LePage, Philip T., Charles D. Canham, K. Dave Coates, and Paula Bartemucci. "Seed abundance versus substrate limitation of seedling recruitment in northern temperate forests of British Columbia." Canadian Journal of Forest Research 30, no. 3 (2000): 415–27. http://dx.doi.org/10.1139/x99-223.

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We examine the influence of (i) the spatial distribution and abundance of parent trees (as seed sources) and (ii) the abundance and favourability of seedbed substrates, on seedling recruitment for the major tree species in northwestern interior cedar-hemlock forests of British Columbia, under four levels of canopy openness (full canopy, partial canopy, large gap, and clearcut). Substrate distribution varied with canopy openness, and substrate favourability was a function of both canopy openness and seedling species. Lack of suitable substrates was the predominant factor limiting seedling densi

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Taylor, Alan H., Zisheng Qin, and Jie Liu. "Tree regeneration in an Abiesfaxoniana forest after bamboo dieback, Wang Lang Natural Reserve, China." Canadian Journal of Forest Research 25, no. 12 (1995): 2034–39. http://dx.doi.org/10.1139/x95-220.

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Bamboos in the understory of Abiesfaxoniana Render & Wilson forests in China impede tree regeneration when they are mature. However, bamboos die back every few decades and may synchronize tree seedling establishment on the forest floor. Tree seedling regeneration patterns were studied beneath 20 canopy gaps and adjacent closed forest in an old-growth A. faxoniana forest where understory bamboos died back in 1976. Most seedlings of A. faxoniana, Acercaudatum Wallich, and Betulautilis D. Don in gaps established 2 years after dieback of the bamboo Fargesiadenudata Yi. Acercaudatum seedlings i

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Battaglia, M., and JB Reid. "The Effect of Microsite Variation on Seed-Germination and Seedling Survival of Eucalyptus delegatensis." Australian Journal of Botany 41, no. 2 (1993): 169. http://dx.doi.org/10.1071/bt9930169.

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The correlation between microsite and seedling numbers was determined in field sowings, and the impact of microsites on germination and seedling survival tested in artificial seedbeds in the glasshouse. Small scale variation in soil conditions, at the scale of tens of centimetres, markedly affected the germination and establishment of Eucalyptus delegatensis R.T.Baker seeds and seedlings. Under conditions of limiting soil moisture, microsites that afforded protection, and probably resulted in increased humidity, caused a marked increase in germination number and rate. The mean survival time wa

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Wallstedt, Anna, Andrew Coughlan, Alison D. Munson, Marie-Charlotte Nilsson, and Hank A. Margolis. "Mechanisms of interaction between Kalmia angustifolia cover and Picea mariana seedlings." Canadian Journal of Forest Research 32, no. 11 (2002): 2022–31. http://dx.doi.org/10.1139/x02-124.

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Sites dominated by Kalmia angustifolia L. are often associated with slow decomposition of organic matter, decreased nitrogen (N) mineralization rates, and low black spruce (Picea mariana (Mill.) BSP) productivity. The objective of this study was to separate the effects of belowground competition by Kalmia from the effects of water-soluble soil phenols on black spruce seedlings growing under different levels of Kalmia cover. A factorial greenhouse bioassay was established in which black spruce seedlings were grown for 6 months in intact blocks of soil with three different levels of Kalmia cover

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Williams, Hans M., David B. South, and Glenn R. Glover. "Effect of bud status and seedling biomass on root growth potential of loblolly pine." Canadian Journal of Forest Research 18, no. 12 (1988): 1635–40. http://dx.doi.org/10.1139/x88-247.

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Container-grown seedlings of Pinustaeda L. with well-formed terminal buds, feather-tops (a succulent shoot tip crowned with a tuft of primary needles), and terminal buds removed (debudded) were sampled in November, December, and January. Root growth potential for unstored and stored seedlings was measured to determine if it is affected by shoot tip morphology. Seedlings with buds or debudded seedlings had higher root growth potential than feather-top seedlings. Root growth potential was correlated with several morphological variables, including total ovendry weight (r = 0.81). As feather-top s

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