Your search for keyword(s) "density" resulted in 75 record(s).

Back to Home Page

View next 15 results

Title: Rotational Grazing Systems and Livestock Grazing Behavior in Shrub-dominated Semi-arid and Arid Rangelands: Journal: Rangeland Ecology & Management; Authors: D. W. Bailey, and J. R. Brown; Date: 2011; Summary: This article is a summary of 58 articles on the effect of rotational grazing systems (RGS) on livestock grazing behavior in shrublands, with attention to riparian area impacts. ...; Agrovoc Control Words: Grazing Intensity, Grazing Lands, Grazing System; View more details about this article

Title: Improving Grazing Management Increases Terrestrial Invertebrate Inputs that Feed Trout in Wyoming Rangeland Streams: Journal: Transactions of the American Fisheries Society; Authors: W. C. Saunders, and K. D. Fausch; Date: 2007; Summary: The effects of season long (SL) and high-density short-duration (HDSD) grazing on terrestrial invertebrates populations and the importance of these invertebrates in rangeland stream systems in western Wyoming were examined. Stream reaches within larger pastures where contrasting grazing systems are used were chosen, ten sites near Lander, WY, in 7 streams on North Platte and Wind River drainages, supporting salmonid populations. Season long grazing occurred from early spring to fall often exceeding 120 days; while in the HDSD system cattle were rotated through riparian pastures in intervals ...; Agrovoc Control Words: Riparian Zones, Trout, Invertebrate; View more details about this article

Title: The measurement of chronic disturbance and its effects on the threatened cactus Mammillaria pectinifera: Journal: Biological Conservation; Authors: C. Martorell, and E. M. Peters; Date: 2005; Summary: In this study, Martorell and Peters measured the impacts of human and livestock disturbance on Mammillaria pectinifera, a threatened Mexican globose cactus. In general, decreases in cactus populations were associated with soil degradation and some human disturbances, whereas cactus populations responded positively to some human disturbances and the presence of livestock. The reduction in shrub cover and the increase in soil stoniness found in pastures with moderate levels of livestock probably benefited cacti by improving the growth environment for this species. The lar ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Density and success of bird nests relative to grazing on western Montana grasslands: Journal: Biological Conservation; Authors: T. F. Fondell, and I. J. Ball; Date: 2004; Summary: The effects of grazing on nest site availability, abundance, success, and mortality on a variety of ground nesting birds were studied on grazed and ungrazed rangelands in western Montana over two years. Two grazing treatments (grazed and ungrazed â‰¥ three years) were evaluated. Vegetation structure was measured in three week intervals from the last week of May to mid-July. When nests were located, nest success and mortality were monitored every 6 days for passerines and every 10 days for other species. ...; Agrovoc Control Words: Grazing, Birds, Bird nests; View more details about this article

Title: Grazing and soil carbon along a gradient of Alberta rangelands: Journal: Rangeland Ecology & Management; Authors: D. C. Henderson, B. H. Ellert, and M. A. Naeth; Date: 2004; Summary: Grazing may alter the carbon sequestration of grasslands by altering above and below-ground carbon inputs and soil properties. In this study, Henderson et al. determined the long term (20+ years) effects of grazing versus grazing exclusion on carbon properties of Alberta grasslands. Grazing altered the species composition, increased the soil bulk density, and decreased the above-ground litter and vegetation carbon pools, all of which can alter below-ground soil properties and nutrient cycling. Soil carbon in mixed grass prairie was positively correlated with clay content, but no grazing eff ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Integrating 2,4-D and sheep grazing to rehabilitate spotted knapweed infestations: Journal: Journal of Range Management; Authors: R. L. Sheley, J. S. Jacobs, and J. M. Martin; Date: 2004; Summary: A 4 year study examined four treatments (spring herbicide only, repeated sheep grazing only, spring herbicide and repeated sheep grazing though out the summer, no herbicide or grazing) to control spotted knapweed (Centaurea maculosa) populations at two sites in Western Montana. The first site was along Bitterroot River near Missoula, MT (46.83Â° N, 114.05Â° W) and the second site was on the flood plain of the Clark Fork River near Drummond, MT (46.79Â° N, 113.20Â° W). Utilization levels were set at 95% for knapweed and 60% for gras ...; Agrovoc Control Words: Weeds, Rangelands, Grazing; View more details about this article

Title: Effects of canopy and grazing on soil bulk density: Journal: Rangeland Ecology & Management; Authors: K. W. Tate, D. M. Dudley, N. K. McDougald, and M. R. George; Date: 2004; Summary: This study was a stratified random survey of soil surface bulk density across all available combinations of three factors at San Joaquin Experimental Range in California. The three factors were: 1) grazing management, 2) canopy cover, and 3) topographic position. Soil surface bulk density was 16 to 22% lower under canopy compared to open grasslands or wedgeleaf ceanothus (Ceanothus cuneatus) interspace. There was no significant difference in soil surface bulk density between sites not grazed > 26 years and sites not grazed for 6 years, indicating that reversal of soi ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Stream bank erosion adjacent to riparian forest buffers, row-crop fields, and continuously-grazed pastures along Bear Creek in central Iowa: Journal: Journal of Soil and Water Conservation; Authors: G. N. Zaimes, R. C. Schultz, and T. M. Isenhart; Date: 2004; Summary: Stream bank erosion rates and total soil loss were measured and compared monthly over one year from June to June along a continuous reach of Bear creek in central Iowa under 3 management strategies (riparian forest buffers, row-crop fields and continuous grazing (May to October)). The stream reach used in this study was classified and divided into meandering or channelized. Meandering subreaches were classified based on management (riparian forest buffers, row crops or continuous grazing). All channelized reaches were managed for row cropping. Erosion pins were used to measure the rate of ...; Agrovoc Control Words: Riparian zones, Grazing, Erosion; View more details about this article

Title: Density and biomass of redband trout relative to stream shading and temperature in southwestern Idaho: Journal: Western North American Naturalist; Authors: B. W. Zoellick; Date: 2004; Summary: Response of redband trout (Oncorhynchus mykiss gairdneri) to stream shading and temperature of Big Jacks and Little Jacks Creeks under season-long grazing and no grazing, respectively in southwestern Idaho was investigated over two years. Topographic maps and aerial photographs were used to stratify each reach into 5 segments, based on stream gradient and canopy cover of riparian plant communities determined from. Trout density and biomass were estimated. Stream or bankfull channel, wetted channel, insolation, stream shading, shading from deciduous vegetation, shading from ...; Agrovoc Control Words: Riparian zones, Streams, Aquatic vertebrates; View more details about this article

Title: Differing effects of cattle grazing on native and alien plants: Journal: Conservation Biology; Authors: S. Kimball, and P. M. Schiffman; Date: 2003; Summary: Effects of herbivory on grazed and ungrazed alien and native species in the California annual grasslands was evaluated using greenhouse and field trials. This study was conducted on the Carrizo Plain National Monument that includes the largest California grassland remnant. Due to the discovery of two endangered forbs a portion of the study site was excluded from grazing ten years prior to this study. In the grazing exclosure, five treatments: control, clipped once (late Feb), clipped twice (late Feb, and early March), clipped three times (late Feb, early March, and early April), mulch remo ...; Agrovoc Control Words: Weeds, Rangelands, Grazing; View more details about this article

Title: Economic and environmental impacts of pasture nutrient management: Journal: Journal of Range Management; Authors: E. Osei, P. W. Gassman, L. M. Hauck, S. Neitsch, R. D. Jones, J. McNitt, and H. Jones; Date: 2003; Summary: Nitrogen and phosphorous losses from manure and fertilizers were modeled for dairy farms (very small, small, medium, and large dairies) with varied stocking densities (6.4, 7.7, 3.5, 2.2 cows/ha) and fertilizer rates (baseline, nitrogen, high and low phosphorus) to identify the combination of management practices that could reduce water pollution, on a northeastern Texas watershed. Two environmental models and one economic model were interfaced together to examine results on a whole-farm scale. Total revenue, total cost, net returns, livestock rations, sales, and cost of individual production ...; Agrovoc Control Words: Riparian zones, Water quality, Stocking density; View more details about this article

Title: Long-term grazing density impacts on soil compaction: Journal: Transactions of the American Society of Agricultural Engineers; Authors: J. A. Daniel, K. Potter, W. Altom, H. Aljoe, and R. Stevens; Date: 2002; Summary: Daniel et al assessed soil compaction, on Oklahoma tallgrass prairie pastures, 10 years after grazing treatments were installed, using penetration resistance, bulk density values, and rate of water infiltration. Long-term grazing increased compaction of soils but only in the top 0 to 10 cm. Penetration resistance indicated that only the heavy stocking density had an impact on soil compaction, while bulk density measurements showed that both moderate and heavy stocking densities had a significant impact. For the clay loam soil, the ungrazed treatment had the largest infiltration rate at 29.5 ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Impacts of grazing systems on soil compaction and pasture production in Alberta: Journal: Canadian Journal of Soil Science; Authors: N. T. Donkor, J. V. Gedir, R. J. Hudson, E. W. Bork, D. S. Chanasyk, and M. A. Naeth; Date: 2002; Summary: Donkor et al. investigate the effects of wapiti (Cervus elaphus canadensis) grazing on soil physical properties and Bromus-Poa pasture production in an Aspen Boreal forest ecosystem. The bulk density at field moist condition and penetration resistance of the top 10-cm of the soil were significantly greater by 15 and 7% under short-duration grazing (SDG) than continuous grazing (CG), respectively, by wapiti. Generally , bulk density at field moist condition in both grazing treatments decreased over winter at the 0-7.5 cm and 12.5-15 cm depths, suggesting that freeze-thaw cycles over the winte ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Effects of grazing intensity on growth, reproduction, and abundance of three palatable forbs in Kansas tallgrass prairie: Journal: Plant Ecology; Authors: K. R. Hickman, and D. C. Hartnett; Date: 2002; Summary: Composition, growth, and reproduction of Aster ericoides, Ruellia humilis, and Amorpha canescens were measured in pastures that were ungrazed or stocked lightly, moderately, or highly with cattle to determine the impacts of different grazing intensities on these subdominant forbs. Stem height and biomass of R. humilis and A. ericoides decreased as grazing intensity increased. Reproductive effort and height of A. canescens decreased with increasing grazing intensity bu ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Foraging geese, vegetation loss and soil degradation in an Arctic salt marsh: Journal: Applied Vegetation Science; Authors: R. L. Jefferies, and R. F. Rockwell; Date: 2002; Summary: Changes in plant cover due to Lesser snow geese (Chen caerulescens caerulescens) herbivory along the salt marshes of La PÃ©rouse Bay, Manitoba (58Â° 45â€™ N, 93Â° 30â€™ W) were measured every year from 1986 until 1997 (except 1983). Ground cover was recorded in June or early July as two categories, either bare sediment or vegetation along permanent transects. Vegetation was measured as plant cover greater than five percent. Goose fecal counts were conducted weekly at the same time as biomass measurements in six, 4m x 4m ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

View next 15 results

Back to Homepage