Academic literature on the topic 'Bluebunch wheatgrass'
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Journal articles on the topic "Bluebunch wheatgrass"
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Orloff, L. Noelle, Jane M. Mangold, and Fabian D. Menalled. "Role of Size and Nitrogen in Competition between Annual and Perennial Grasses." Invasive Plant Science and Management 6, no. 1 (March 2013): 87–98. http://dx.doi.org/10.1614/ipsm-d-12-00035.1.
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AbstractDiffering life histories contribute to difficulties establishing perennial grasses on lands dominated by exotic annual grasses. In a greenhouse study, we investigated to what extent allowing the perennial grass bluebunch wheatgrass to emerge before the exotic annual grass downy brome would increase its competitive ability and whether modifying nitrogen (N) would affect competition. We conducted an addition-series factorial experiment. In three cohort treatments, the two species were seeded concurrently or bluebunch wheatgrass was at the two- or four-leaf stage when downy brome was planted. N treatments were low (ambient) or high (N added to maintain 10 mg kg−1 [0.1286 oz lb−1]). Larger bluebunch wheatgrass avoided suppression by downy brome regardless of N. Under concurrent sowing, doubling downy brome density decreased bluebunch wheatgrass biomass by 22.6% ± 2.38 SE. In contrast, when bluebunch wheatgrass had a four-leaf size advantage, the same increase in downy brome density decreased bluebunch wheatgrass biomass by 4.14% ± 2.31. Larger bluebunch wheatgrass also suppressed downy brome more effectively, but N enrichment decreased the suppressive ability of bluebunch wheatgrass.
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Jacobs, James S., Roger L. Sheley, and Bruce D. Maxwell. "Effect ofSclerotinia sclerotiorumon the Interference between Bluebunch Wheatgrass (Agropyron spicatum) and Spotted Knapweed (Centaurea maculosa)." Weed Technology 10, no. 1 (March 1996): 13–21. http://dx.doi.org/10.1017/s0890037x00045644.
Full textAbstract:
Effectiveness of the common soil fungusSclerotinia sclerotiorumas a biological control for spotted knapweed and its effect on competitive interactions between spotted knapweed and bluebunch wheatgrass were evaluated in a growth chamber study using addition series methods. Total seeding densities ranged from 2000 to 60 000 seeds/m2. Mean bluebunch wheatgrass plant weight was 3.5 times greater than spotted knapweed weight per plant, respectively. Coefficient ratios estimating species interaction showed bluebunch wheatgrass density had a greater influence than spotted knapweed density on both bluebunch wheatgrass and spotted knapweed weights (2.11 and 0.51, respectively) when not under the influence ofS. sclerotiorum. Niche differentiation ratios indicated a lack of resource partitioning between species (1.11).S. sclerotiorumreduced spotted knapweed density by 68 to 80% without reducing bluebunch wheatgrass density. Spotted knapweed weight per plant also was reduced by the addition of 5.sclerotiorum(1.4 to 1.2 mg) but there was not a corresponding increase in bluebunch wheatgrass weight.S. sclerotiorumdecreased competition between spotted knapweed and bluebunch wheatgrass. This study provides evidence that establishment of bluebunch wheatgrass on spotted knapweed infested rangeland may be improved by combiningS. sclerotiorumwith high grass seeding rates.
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Nowak, Robert S., and Martyn M. Caldwell. "Photosynthetic Characteristics of Crested Wheatgrass and Bluebunch Wheatgrass." Journal of Range Management 39, no. 5 (September 1986): 443. http://dx.doi.org/10.2307/3899448.
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Gibbs, J. L., G. Young, and J. R. Carlson. "Registration of ‘Goldar’ Bluebunch Wheatgrass." Crop Science 31, no. 6 (November 1991): 1708. http://dx.doi.org/10.2135/cropsci1991.0011183x003100060083x.
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Sheley, Roger L., and James S. Jacobs. "“Acceptable” Levels of Spotted Knapweed (Centaurea maculosa) Control." Weed Technology 11, no. 2 (June 1997): 363–68. http://dx.doi.org/10.1017/s0890037x00043074.
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Competition between bluebunch wheatgrass and spotted knapweed was quantified using three addition series experiments in an environmental chamber. Using two density matrices, spotted knapweed plants were thinned by either 45 or 90% of their original densities 40 d after emergence. Another matrix of density combinations was not thinned. All plant material was harvested 90 d after thinning. Spotted knapweed was about four times more competitive than bluebunch wheatgrass. Reducing spotted knapweed by 45% did not alter the competitive relationship between the two species. We believe remaining knapweed individuals captured the majority of the newly available resources. Ninety percent reduction was necessary to shift the competitive relationship in favor of bluebunch wheatgrass. Successful integrated spotted knapweed management must exploit key mechanisms and processes directing plant community dynamics, in conjunction with weed density reduction, if communities are to be shifted toward those that are desired.
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Jensen, Kevin B., Michael Curto, and Kay Asay. "Cytogenetics of Eurasian Bluebunch Wheatgrass and Their Relationship to North American Bluebunch and Thickspike Wheatgrasses." Crop Science 35, no. 4 (July 1995): 1157–62. http://dx.doi.org/10.2135/cropsci1995.0011183x003500040041x.
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Ralphs, Michael H. "Response of Broom Snakeweed (Gutierrezia sarothrae) and Cool-Season Grasses to Defoliation." Invasive Plant Science and Management 2, no. 1 (January 2009): 28–35. http://dx.doi.org/10.1614/ipsm-08-075.1.
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AbstractBroom snakeweed is one of the most widespread range weeds in western North America. Although a native plant, it increases with disturbance such as overgrazing, fire, and drought, and can dominate sites. The objective of this study was to test the hypothesis that defoliation of broom snakeweed alone, and along with associated grasses, would reduce its vigor and increase its mortality in bunchgrass plant communities. The study was conducted at two locations: near Nephi, UT in an invaded crested wheatgrass stand and at Howell, UT in a bluebunch wheatgrass/Wyoming big sagebrush community. Clipping treatments consisted of (1) untreated Control; (2) All Clip—clipping all herbaceous vegetation 2 cm above the soil surface, and current season foliar growth of snakeweed; (3) Grass Clip—clipping all grass and forb plants; (4) Snakeweed Clip—clipping current season foliar growth. Treatments were randomly assigned to 1-m2plots and clipped in May or late August. Plots were measured and clipped at the respective seasons annually from 2004 to 2007. Defoliation of snakeweed in spring in the Snakeweed Clip treatment caused higher mortality and lower size and vigor of remaining plants than the other treatments at the end of the study. Clipping all vegetation also reduced snakeweed density at Nephi, but not at Howell. There was little regrowth of bluebunch wheatgrass at Howell in the All Clip treatment; thus, it was likely to have not competed with snakeweed regrowth for limited soil moisture. Bluebunch wheatgrass cover declined at Howell in the All and Grass Clip treatments. Crested wheatgrass was not adversely affected by spring defoliation in the All and Grass Clip treatments, and it increased in the Snakeweed Clip treatment. There were few differences in the fall defoliations. Spring defoliation of snakeweed put it at a competitive disadvantage with both intact perennial bunchgrasses and regrowth crested wheatgrass, thus enhancing its mortality.
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Jones, T. A., S. R. Larson, D. C. Nielson, S. A. Young, N. J. Chatterton, and A. J. Palazzo. "Registration of P‐7 Bluebunch Wheatgrass Germplasm." Crop Science 42, no. 5 (September 2002): 1754–55. http://dx.doi.org/10.2135/cropsci2002.1754.
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Fu, Yong-Bi, and Don Thompson. "Genetic diversity of bluebunch wheatgrass (Pseudoroegneria spicata) in the Thompson River valley of British Columbia." Canadian Journal of Botany 84, no. 7 (July 2006): 1122–28. http://dx.doi.org/10.1139/b06-066.
Full textAbstract:
Bluebunch wheatgrass ( Pseudoroegneria spicata (Pursh) A. Löve) is a cool-season perennial grass native to semi-arid regions of western North America and has been used for habitat restoration. However, the genetic diversity of this species is poorly understood. A total of 172 expressed sequence tag-derived simple sequence repeat (eSSR) primer pairs that had been developed for wheat were characterized for genetic diversity studies of bluebunch wheatgrass. Of these, 12 eSSR primer pairs were found to be informative and were applied to screen 216 plants collected from six locations with two different elevations in the Thompson River valley of British Columbia. These analyses revealed a total of 106 eSSR polymorphic alleles (or bands) scorable for each sample. The number of polymorphic bands per primer pair ranged from 2 to 17 with a mean of 8.8. The frequencies of these bands ranged from 0.005 to 0.995 and averaged 0.146. Most (92.6%) of the eSSR variation detected was present within the 12 populations assessed. The between-population eSSR variability was significantly associated with their geographic distances, but not with their elevations. These findings are useful for genetic diversity and genetic mapping studies of this grass species and should facilitate the sampling and development of bluebunch wheatgrass germplasm for germplasm conservation and habitat restoration.
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Houseal, G. A., and B. E. Olson. "Nutritive value of live and dead components of two bunchgrasses." Canadian Journal of Animal Science 76, no. 4 (December 1, 1996): 555–62. http://dx.doi.org/10.4141/cjas96-083.
Full textAbstract:
On northern latitude winter rangelands, the effects of low forage nutritive value on animal performance are usually mitigated by supplementing livestock, although the amount of supplement is often not adjusted for available forage quantity and nutritive value. The objective of this study was to assess the potential of live (fall, spring) and dead component of two cool-sea-son bunchgrasses to meet nutritional requirements of cattle from fall through spring on a foothills range site in southwestern Montana. Several nutritive characteristics of live and dead components of bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Love) and Idaho fescue (Festuca idahoensis Elmer) were assessed during the winters of 1991–1992 and 1992–1993. In addition, rate and extent of dry matter disappearance, and extent of crude protein disappearance were determined in-situ using ruminally cannulated beef cows. Nutritive value of forage components of bluebunch wheatgrass and Idaho fescue were similar fall through spring. Fall growth was similar in CP and digestibility to April growth, and maintained these levels through winter. With normal forage intake rates on winter range, CP levels of standing dead material would not meet animal protein requirements fall through spring. When fall growth is not abundant, more protein supplement would be needed than when it is abundant. Matching animal requirements to forage availability and nutritive value, supplementing only when necessary and in appropriate amounts, could help reduce costs of winter feeding. Key words: Winter grazing, bluebunch wheatgrass, Idaho fescue, forage quality, cattle
Dissertations / Theses on the topic "Bluebunch wheatgrass"
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Sloane, Charles Emanuel. "Effects of sugar beet pulp on cheatgrass and bluebunch wheatgrass growth under controlled conditions." Thesis, Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/sloane/SloaneC0511.pdf.
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Cheatgrass (Bromus tectorum L.,) an invasive, annual grass species, degrades range and pasture lands by out competing and replacing preferred native grass species resulting in economic and ecological losses. Current control strategies are costly and ecological risky. Soil nitrogen depletion by promoting microbial nitrogen utilization by application of a carbohydrate energy source such as sucrose may decrease cheatgrass's competiveness and permit seedling establishment of preferred native species. Review of the literature reveals attempts at restoration of native grasses and elimination of cheatgrass by nitrogen depletion with sucrose applications have failed or at best achieved limited success. We believe one reason for failure is that soil microbes utilize applied simple carbohydrates such as sucrose too rapidly resulting in only short periods of nitrogen depletion, and that application of sugar beet pulp may promote a longer state of nitrogen depletion. We hypothesize the growth of nitrogen dependent invasive grasses will be inhibited by nitrogen deprivation produced by mulch application of coarse granulated sugar beet pulp, and that the inhibition of growth is not related to a passive mulch effect. In a four armed green house study, we compared cheatgrass and bluebunch wheatgrass growth after application of ground sugar beet pulp at rates of 0.0, 0.5, 1.0 2.0 and 4.0 tons per acre. As a control, granite chicken grit was similarly applied in equal volumes to rule out a passive mulch effect. At 35 days, there was a negative linear relationship between rate of sugar beet pulp application and cheatgrass growth (p <0.001) and BBW growth (p<0.002). The negative effect of sugar beet pulp on cheatgrass growth was twice the negative effect on blue bunch growth. Granite grit application did not decrease growth of either species. We conclude that sugar beet pulp application depresses cheatgrass growth and that the cause is not a passive mulch effect. Our data indicates that longer duration nitrogen deprivation may aid in promoting restoration of cheatgrass dominated acreages, and treatments such as sugar beet pulp application may permit native grass seedling emergence and establishment.
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Parkinson, Morgan Elaine. "Developing Rangeland Restoration Techniques: A Look at Phosphorus Fertilizer as a Seed Coating to Improve Bluebunch Wheatgrass Growth." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/9171.
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Planting native species after a major disturbance is a critical tool land managers use to stabilize soils, restore ecosystem processes, and prevent weed invasion. However, within the sagebrush steppe and other arid and semi-arid environments the percentage of sown seeds that produce an adult plant is remarkably low. Applying fertilizers at the time of planting may improve native plant establishment by increasing the ability of the seedlings to cope with environmental stresses. However, traditional fertilizer applications are often economically infeasible and may be counterproductive by encouraging weed invasion. Seed coating technology allows for the efficient application of fertilizers within the microsite of the seeded species. The objective of our research was to determine the optimal rate of fertilizer to apply to the seed to improve seedling emergence and plant growth. We applied a phosphorus (P) rich fertilizer (0.13 g P g-1) to bluebunch wheatgrass (Pseudoroegneria spicata (Pursh) Á. Löve) seeds in a rotary coater at rates ranging from 0 to 50 g of fertilizer 100 g-1 seed. Three separate studies were conducted to test germination, biomass, relative growth rate, and tissue nutrient uptake. Study one showed decreasing root and shoot biomass and increasing time to 50% germination as fertilizer rates increased. Study two showed no difference in relative growth rate between the controls and fertilizer treatments. Study three showed no difference in root and shoot biomass or nutrient concentration between treatments except in the lowest fertilizer treatment (10 g fertilizer 100 g-1 seed), which was significantly lower in root and shoot biomass than all other treatments but had higher P tissue concentrations than all other treatments. Collectively these results showed no evidence that a P fertilizer coating could aid in bluebunch wheatgrass seedling establishment. Because bluebunch wheatgrass and similar late-seral plants have evolved with low nutrient requirements they may not be physiologically capable of handling increased nutrient supply, which may explain the results of our studies. Continued studies and fieldwork need to be performed to evaluate the potential of fertilizer seed coatings in restoration efforts.
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Badrakh, Turmandakh. "Effects of Abscisic Acid (ABA) on Germination Rate of Three Rangeland Species." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5881.
Full textAbstract:
Seeds sown in the fall to restore sagebrush (Artemisia spp.) steppe plant communities could experience high mortality when they germinate and seedlings freeze during the winter. Delaying germination until the risk of frost is past could increase seedling survival. We evaluated the use of abscisic acid (ABA) to delay germination of Elymus elymoides, Pseudoroegneria spicata, and Linum perenne. The following treatments were applied: uncoated seed, seed coated with ABA at 2.2, 4.4, 8.8, 13.2, and 17.6 g of active ingredient kg-1 of seed, and seed coated with no ABA. The influence of seed treatments on germination were tested at five different incubation temperatures (5-25°C). The lowest application rate of ABA had no significant influence on germination percentage but higher application rates showed a decline. All concentrations of ABA tested delayed germination, especially at low incubation temperatures. For example, the time required for 50% of the seeds to germinate at 5°C was increased with the use of the lowest ABA application rate by 56, 61, and 14 days, for E. elymoides, P. spicata, and L. perenne, respectively. Quadratic thermal accumulation regression models were developed for each species and treatment to predict progress toward germination. For the two grasses, models had sufficient accuracy (R2 = 0.61- 0.97) to predict germination timing using field seedbed temperatures. Equations for L. perenne were less accurate (R2 = 0.03-0.70). Use of these models will allow testing whether ABA will delay germination sufficiently to avoid winter frost periods and provide the basis for future field tests.
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Mukherjee, Jayanti Ray. "Evaluating Native Wheatgrasses for Restoration of Sagebrush Steppes." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/659.
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Pseudoroegneria spicata and Elymus wawawaiensis are two native perennial bunchgrasses of North America's Intermountain West. Frequent drought, past overgrazing practices, subsequent weed invasions, and increased wildfire frequency have combined to severely degrade natural landscapes in the region, leading to a decline in the abundance of native vegetation. Being formerly widespread throughout the region, P. spicata is a favorite for restoration purposes in the Intermountain West. Elymus wawawaiensis, which occupies a more restricted distribution in the Intermountain West, is often used as a restoration surrogate for P. spicata. However, since most restoration sites are outside the native range of E. wawawaiensis and as the use of native plant material may be more desirable than a surrogate, the use of E. wawawaiensis as a restoration plant material has been somewhat controversial. The main goal of my research was to identify plant materials of these species with superior seedling growth, drought tolerance, and defoliation tolerance, traits that may contribute to enhanced ecological function in restored rangeland plant communities.
I conducted a growth-chamber study to evaluate morphological and growth-related traits of germinating seedlings of these two species. My study suggested that, while the two bunchgrasses are similar in many ways, they display fundamentally different strategies at the very-young seedling stage. While P. spicata exhibited greater shoot and root biomass to enhance establishment, E. wawawaiensis displayed high specific leaf area (SLA) and specific root length (SRL), two traits commonly associated with faster growth.
According to the eco-physiology literature, plants with greater stress tolerance display lesser growth potential. However, my greenhouse study showed that E. wawawaiensis was relatively more drought tolerant than P. spicata, despite higher expression of growth-related traits, e.g., SLA and SRL. While the two species displayed similar water use efficiency when water was abundant, E. wawawaiensis was also more efficient in its water use when drought stress was imposed.
In a field study, I found E. wawawaiensis to be twice as defoliation tolerant as P. spicata. This study showed that P. spicata is typically more productive in the absence of defoliation, but E. wawawaiensis was more productive after defoliation due to its superior ability to recover and hence is a better candidate for rangelands that will be grazed.
Hence, my study showed that E. wawawaiensis, despite being regarded as a surrogate for P. spicata, exhibits superior seedling establishment, drought tolerance, and defoliation tolerance. Therefore, E. wawawaiensis has advantages as a restoration species for the Intermountain West.
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Anderson, Rhett Michael. "Novel Techniques to Improve Restoration of Native Rangeland Species." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8885.
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The sagebrush steppe is a particularly sensitive ecosystem that is easily disturbed by fires, oil and gas extraction, woody-plant encroachment, and overgrazing. The natural regeneration of native species following a disturbance within this system is typically slow and sporadic, which allows invasive grasses to occupy the landscape. Attempts to assist the recovery of these landscapes through direct seeding is commonly met with poor success rates, particularly in lower elevation, drier sites. Novel seed enhancement technologies and planting techniques that mitigate limiting factors impairing restoration efforts may improve the likelihood of restoring these degraded areas. For chapter 1, we evaluated a solid-matrix priming technique, where bluebunch wheatgrass (Pseudoroegneria spicata) and Lewis flax (Linum lewisii) were primed and then the priming matrix and seed were pelleted together. We evaluated primed seed that had been incorporated into pellets at two field sites against seed that was pelleted but been left unprimed, and untreated seed (control). These three seed treatments were planted in the spring (mid-march) in shallow (2-cm) and deep (15-cm) furrows, in a complete factorial design. We found that primed seeds generally produced higher plant densities than control seed at the beginning of the growing season; however, its influence diminished towards the end of the growing season. We also found that deep furrows increased plant density throughout the growing season and even into the following year. The combination of priming and deep furrows outperformed control seed in shallow furrows in all measured metrics. For chapter 2, we evaluated a seed conglomeration technique for improving Wyoming big sagebrush (Artemisia tridentata ssp. Wyomingensis) emergence and survival under fall and winter plantings. The trial was implemented at five sites across Utah and Nevada in a randomized complete block-split-split plot design, with site, and planting season, comprising the split-plot factors. Each site and season combination was seeded with conglomerated and control seed. We found that in most cases, a fall seeding of Wyoming big sagebrush was either the same or more successful compared to planting on the snow in the winter, which is the current suggested practice. Our results also demonstrated that seed conglomeration produced higher plant densities compared to control seed throughout the growing season. The higher density of plants produced from conglomerates combined with the improved seed delivery provided by the conglomeration technique was estimated to offset the cost in producing conglomerates and reduce overall restoration costs by 41%.
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Young, Kert R. "Plant Establishment and Soil Microenvironments in Utah Juniper Masticated Woodlands." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3318.
Full textAbstract:
Juniper (Juniperus spp.) encroachment into sagebrush (Artemisia spp.) and bunchgrass communities has reduced understory plant cover and allowed juniper trees to dominate millions of hectares of semiarid rangelands. Trees are mechanically masticated or shredded to decrease wildfire potential and increase desirable understory plant cover. When trees are masticated after a major increase in tree population density and associated decrease in perennial understory cover, there is a risk that invasive annual grasses will dominate because they are highly responsive to the increased resource availability that commonly follows removal of the main resource user. To determine if tree mastication increases resource availability and subsequently favors invasive annual or perennial grasses, we compared soil temperature, water, and nutrient microenvironmental conditions and seedling establishment and growth. We used the major rangeland weed, cheatgrass (Bromus tectorum L.), to represent invasive annual grasses and Anatone bluebunch wheatgrass (Pseudoroegneria spicata (Pursh) A. Löve), a natural accession of native bluebunch wheatgrass, to represent the perennial grasses of the sagebrush-bunchgrass plant community. These comparisons were made between and within paired-adjacent masticated and untreated areas at three locations in Utah dominated by Utah juniper (Juniperus osteosperma (Torr.) Little). Juniper tree mastication generally increased resource availability with masticated areas having greater soil temperature, soil water availability, and soil N supply rates than untreated areas. Prior to juniper tree mastication litter mounds were not found to be resource islands probably because juniper trees themselves were using subcanopy soil water and nutrients. After juniper tree mastication and elimination of these predominant resource users, litter mounds served as resource islands with greater soil water availability and N supply rates than bare interspaces during the critical time for seedling establishment in spring. Plant growth followed in line with greater resource availability after tree mastication with masticated areas having more productive although fewer invasive-annual and perennial grass seedlings than untreated areas. These results suggest that increases in resource availability and warmer spring temperatures associated with mastication will not necessarily favor invasive annual over perennial grass seedling establishment. Resilience of the sagebrush-bunchgrass community to return to dominance after juniper control will likely be greatly influenced by how much of the sagebrush-bunchgrass community remains following tree control and the intensity of propagule pressure by invasive species. If only invasive annuals remain when the trees are treated then invasive annuals would be expected to dominate the post-treatment plant community especially with their ability to establish inside litter mounds unless they were also controlled and perennial grasses planted at the time of treatment.
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Grammon, Arnold A. "Comparative seedling growth of diffuse knapweed and bluebunch wheatgrass under altered moisture and temperature regimes." Thesis, 1997. http://hdl.handle.net/1957/33844.
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In many areas of the Western U.S., diffuse knapweed (Centaurea diffusa Lam.)
has invaded into plant communities dominated by bluebunch wheatgrass
(Pseudomegnaria spicata [Pursh] A. Love). The objectives of this study were to compare
growth response of both species when grown under altered moisture and temperature
regimes while in the seedling stage and to further elucidate the competitive ability of
diffuse knapweed compared to bluebunch wheatgrass. Isolated individuals were grown
in four different environmental chamber conditions (12 hr day length, 10 and 16C and -0.01 MPa and -0.03 MPa soil moisture). Diffuse knapweed penetrated quicker than
bluebunch wheatgrass starting on day 20, regardless of temperature and moisture and
knapweed penetration was greatest under warm and wet soil conditions. Bluebunch
wheatgrass developed more root length initially under warmer and drier conditions, but
those differences diminished after thirty days growth. Warmer and wetter soil conditions
favored diffuse knapweed leaf area production in later stages of seedling growth. Diffuse
knapweed had more rapid root penetration than bluebunch wheatgrass under the
conditions studied. Diffuse knapweed maximized shoot production, indicative of a
relatively fast growing species, while bluebunch wheatgrass maximized root production,
characteristic of a relatively slow growing species. Diffuse knapweed seedlings grew
best under warmer and wetter conditions. Comparing plant efficiency (indices of plant
efficiency based on the measurement of a plant attribute divided by the total biomass of
the plant), diffuse knapweed was apparently more efficient than bluebunch wheatgrass at
producing the competitive attributes of root penetration, leaf area and root length.Graduation date: 1998
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Sapsis, David B. "Ecological effects of spring and fall prescribed burning on basin big sagebrush : Idaho fescue--bluebunch wheatgrass communities /." 1990. http://hdl.handle.net/1957/9114.
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Bryant, Larry Duane. "Quality of bluebunch wheatgrass (Agropyron spicatum) as a winter range forage for Rocky Mountain Elk (Cervus elaphus nelsoni) in the Blue Mountains of Oregon." Thesis, 1993. http://hdl.handle.net/1957/37642.
Full textAbstract:
This research was conducted on three study areas on elk winter
ranges in Northeast Oregon. One was on the Starkey Experimental
Forest and Range and the others were in the same vicinity. Plant
appendages, spring and fall defoliation and fall growth of bluebunch
wheatgrass were evaluated in terms of quality of nutrient content
during September through April of 1986-87 and 1987-88. Four
treatments were applied. Plants were clipped to a 2.5 cm and 7.6 cm
stubble height in the spring before the boot stage of phenological
development; plants were clipped to a 7.6 cm stubble height in the
fall after plant maturity in September; plants were not clipped
during the year. Percent crude protein, dry matter digestibility
(DMD), acid detergent fiber (ADF), and lignin were evaluated
monthly. Samples from the four treatments were also analyzed from
October to April to determine monthly changes in nutrient contents.
Production of growth from all treatments was measured in October and
March each year.
Leaf material had higher percent crude protein and DMD, with
lower percent ADF and lignin than the inflorescence and culm. The
third leaf (the youngest plant material) had the highest nutrient
value of all appendages. The culm and inflorescence values were not
statistically different.
Growth following spring defoliation treatments produced higher
percent crude protein and DMD (P<.05), with a lower percent ADF and
lignin than non-treated plants in both years. This was particularly
pronounced during 1986 when precipitation in late summer initiated
fall growth. Growth following spring defoliation and bluebunch
wheatgrass not defoliated did not produce crude protein or DMD
values sufficient to meet minimum dietary maintenance requirements
for elk.
Fall precipitation adequate to promote fall growth occurred
only in 1986. Growth after fall defoliation had the highest percent
crude protein and DMD with the lowest ADF and lignin values of all
vegetation sampled. However, without 3-5 cm of late summer/early
fall rains, fall growth does not occur. This happened in 1987.
When growth does occur in fall the quality of the growth exceeds the
minimum dietary maintenance requirements for elk.
Freezing and thawing of fall growth plant material had minimal
effect on forage quality. There were differences (P<.05) between
the monthly values for percent crude protein and ADF starting in
October and ending in April. However, the percent DMD and lignin
from October to April were not different (P<.05).Graduation date: 1993
Books on the topic "Bluebunch wheatgrass"
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Anderson, Loren D. Bluebunch wheatgrass defoliation effects and vigor recovery: A review. Boise, Idaho: Bureau of Land Management, Idaho State Office, 1991.
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Miller, Richard F. The ecology and management of bluebunch wheatgrass (Agropyron spicatum): A review. Corvallis, Or: Agricultural Experiment Station, Oregon State University, 1986.
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Competitive effects of bluebunch wheatgrass, crested wheatgrass, and cheatgrass on antelope bitterbrush seedling emergence and survival. Ogden, UT: U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 1999.
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Grammon, Arnold A. Comparative seedling growth of diffuse knapweed and bluebunch wheatgrass under altered moisture and temperature regimes. 1997.
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5
Sapsis, David B. Ecological effects of spring and fall prescribed burning on basin big sagebrush: Idaho fescue--bluebunch wheatgrass communities. 1990.
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6
Bryant, Larry Duane. Quality of bluebunch wheatgrass (Agropyron spicatum) as a winter range forage for Rocky Mountain Elk (Cervus elaphus nelsoni) in the Blue Mountains of Oregon. 1993.
Find full textReports on the topic "Bluebunch wheatgrass"
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Hall, Derek B., Val Jo Anderson, and Stephen B. Monsen. Competitive effects of bluebunch wheatgrass, crested wheatgrass, and cheatgrass on antelope bitterbrush seedling emergence and survival. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 1999. http://dx.doi.org/10.2737/rmrs-rp-16.
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