1 edition of Effects of grazing intensity upon vegetation found in the catalog.
Effects of grazing intensity upon vegetation
W. M. Johnson
|Statement||by W.M. Johnson|
|Series||Circular / United States Department of Agriculture -- no. 929, Circular (United States. Dept. of Agriculture) -- no. 929.|
|The Physical Object|
|Pagination||36 p. :|
|Number of Pages||36|
Over-grazing occurs when too many animals are grazed on a pasture or there is prolonged grazing, particularly at critical stages of pasture growth. It is essential for pasture health to manage grazing frequency and intensity. Failure to do this can result in severe degradation of pasture and soil. Preparing a grazing management plan. Get this from a library! Effects of different systems and intensities of grazing upon the native vegetation at the Northern Great Plains Field Station. [J T Sarvis; United States. Department of Agriculture.; North Dakota Agricultural College.; United States. Bureau of Plant Industry.].
grazing effects will be markedly different in grassland types with dif-ferent species composition, biomass, and diversity. We tested the (a) Habitat-dependent effects of intensity hypothesis, and we expected that the effect of grazing intensity on species and functional diver-sity is . Nonetheless, rotational grazing is better than continuous grazing to some degree. Additionally, because the vegetation type, grazing intensity, grazing time and livestock type are different from other examples and conditions, the effects of the grazing system on .
Action: Reduce grazing intensity Key messages Read our guidance on Key messages before continuing. Nine studies from the USA and the UK, one replicated and controlled, found increases in populations of some species on fields with reduced grazing, or increased use of such fields by of the studies used multiple interventions at once. The vegetation in site 2 was composed of a higher proportion of increasing and invading species, due to the somewhat drouthy conditions. Precipitation during the grazing season was above normal. Although the effect of excessive moisture would be to stimulate forage production, its effect upon palatability is not known.
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Open : The Effects of Grazing Intensity on Annual Vegetation MICHAEL D. PITT AND HAROLD F. HEADY Abstract Pastures grazed by sheep at moderate and 1%, 2- and 2% times the moderate stocking rate from were analyzed for relative changes in cover, herbage productivity, and Cited by: The effects of grazing intensity, year and their interactions on species composition and species diversity were analyzed by using the residuals of diversity-species biomass linear regression in the Repeated Measures ANOVA - mixed model.
The statistical model included grazing intensity, block, year and their interactions as fixed by: Grazing intensity can elicit vegetation changes through shifts in plant functional group dominance (Manley et al.Biondini et al.Derner and HartMilchunas et al.which may.
The much shorter exposure to recent grazing pattern (post), which was nearly inverse to the historic grazing pattern, showed increase of vegetation cover (centres) and species richness (matrix) with recent grazing intensity. We interpret these effects as still visible responses of the lower grazing intensity in these camps during the Cited by: 5.
effects of grazing intensity on vegetation structure, plant species diversity and plant communities over four years. I used the Mantel test and non-metric multidimensional scaling to illustrate changes in plant communities with varying grazing intensities and over time.
Effects of grazing. The influence of grazing intensity on the state of soils, vegetation, composition of arachnids, and land-nesting birds in arid-steppe ecosystems of the Manych Valley is discussed. It is shown that, with an increase in grazing intensity, the height of plants, projective cover, land phytomass, humus content, and soil humidity decrease, whereas the soil density increases in the surface layer.
Grazing intensity appears to influence the physical properties of soil and vegetation. Differences in bulk density, porosity, plant biomass, and vegetative cover were all noted. It was found that decaying litter may be the most critical determinate for soil protection.
Also, grazing intensity is. Grassland responses to grazing: effects of grazing intensity and management system in an Inner Mongolian steppe ecosystem. Plant and Soil (1): Stavi I., E.D., Ungar, H., Lavee, P.S., Grazing-induced spatial variability of soil bulk density and content of moisture, organic carbon and calcium carbonate in a semi-arid rangeland.
This comprehensive volume provides authoritative review on a wide range of relevant topics: animal nutrition and nutritional balance when fed on different sorts of grazing lands; seasonal variation and limits placed on ecosystems by grazing; the effects of grazing on grazing lands; the various sorts of grazing behaviors; selecting plants and managing grazing lands, as well as many other important topics bearing upon the methods, practises and procedures for properly managing grazing lands 5/5(1).
Decreases in vegetation δ 15 N values as grazing intensity increased also are consistent with increasing uptake of atmospheric NH 3 (δ 15 N at − ± ‰) (Moore, ) and possibly decreasing uptake of soil N (δ 15 N in the range of –‰) from sub-surface layers as grazing.
NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH (JUNE THE EFFECTS OF FREQUENCY AND INTENSITY OF GRAZING ON THE GENOTYPIC STRUCTURE OF A RYEGRASS POPULATION By R. BROUGHAM,* A. GLENDAY,t and S. FEJER* (Received for publication, 19 February ) Summary An experiment is described in which changes in the genotypic.
FREQUENCY AND INTENSITY OF GRAZING AND THEIR EFFECTS ON PASTURE PRODUCTION R. W.B ROUGHAM Grasslands Division, DSIR, Palmerston North IN New Zealand, as in a number of other pastoral areas (A the world, controversy has surrounded the value of pasture. Savanna grasslands are globally important ecosystems consisting of one of the most extensive grazing lands with unique biodiversity.
The objectives of the study were to assess the effect of grazing intensity on grassland ecosystem condition, herbaceous plant biomass production, and nutritional content of selected grass species. The study was conducted at Chagni Ranch, Northwest.
Get this from a library. Effect of grazing intensity upon vegetation and cattle gains on ponderosa pine-bunchgrass ranges of the Front Range of Colorado. [W M Johnson; United States. Department of. We conducted studies in native prairie mixed-grass pastures in south~central North Dakota (U.S.A.) during to determine how different grazing intensities affected structural characteristics of vegetation, livestock production and the occurrence and density of grassland birds.
Generally, as grazing treatment intensity increased from light to extreme, mean vegetation structural values Cited by: 2.
Grazing reduced the biomass of annuals in open patches of both topographic sites, but not in the shrub patches. On the north-facing slope, grazing also reduced plant density and richness in the. (ii) Intensive grazing results in fewer flowers and a lower diversity of flower‐visiting insects than low‐intensity grazing, i.e.
low‐intensity grazing is optimal for many flowering plants and insects. (iii) The diversity of different taxonomic groups shows different patterns in response to local habitat and landscape composition.
Based on these studies, only five indicators, Shannon–Wiener index, aboveground biomass, vegetation cover, soil organic carbon, and soil total nitrogen, were used to analyze grazing intensity separately from grazing/ungrazing comparisons because the data pools of other indicators were too small for analyzing the grazing intensity influences.
Questions have been raised about whether herbaceous productivity declines linearly with grazing or whether low levels of grazing can increase productivity. This paper reports the response of forage production to cattle grazing on prairie dominated by Kentucky bluegrass (Poa pratensis L.) in south-central North Dakota through the growing season at 5 grazing intensities: no grazing, light.
The insect groups responded differently to grazing intensity. Species richness and abundance differed between management regimes for beetles and hoverflies but not for bees and butterflies.
4. The effects of local habitat and landscape composition on species richness, abundance and composition differed between groups.The effects of grazing or any other form of defoliation on a grass plant are directly related to how grasses grow.
These effects depend upon the following: Intensity and Frequency of Grazing: Grazing (defoliation, trampling, or other losses) intensity is the amount (percentage) of plant tissue removed by grazing animals.
Frequency refers to how often a plant is grazed.Grazing Intensity Defined Grazing intensity and percent utilization are often used in- terchangeably but actually differ in what they describe.
We define grazing intensity as the cumulative effects grazing animals have on rangelands during a particular time period. In contrast utilization is .