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The Effects of Different Grazing Intensities on the Vegetation, Soil and Livestock Gain Weight in Inner Mongoia Typical Steppe

Author: SaRenGaoWa
Tutor: AoTeGen；WangChengJie
School: Inner Mongolia Agricultural University
Course: Grassland
Keywords: Grazing intensity Vegetation communities Soil Livestock
CLC: S812
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


This study in July-September 2010, where the Xilin Gol League Zhengxiangbaiqi volume Figure pasture grazing to S. krylovii typical steppe Simmental (2 years) as the research object, different grazing intensity (control, light , moderate, severe), and to explore the typical steppe grassland plant communities, soil and livestock production performance suitable stocking rates, and provide a reference for reducing grassland degradation, increase economic efficiency. The main findings are as follows (significant level are P lt; 0.05): 1 vegetation: the total coverage of the various processing grass group, the height of the general trend of the total aboveground biomass for the control area gt; mild gt; moderate gt; severe and the degree of deviation of its amount increased with increasing grazing intensity grazing after recovery growth elasticity of severe to gt; moderate gt; mild; major advantage of aboveground biomass as Artemisia frigida relative biomass increases; at 0-30cm underground biomass size Sort control gt; heavy degree gt; mild gt; moderate; heavy degree of grazing so that the 0-5cm underground biomass surface of significantly; vertical distribution, each processing aboveground biomass volume decreases with the increase of soil depth. 2 (0-10cm) of soil physical properties: different grazing intensity soil water content sorted from control gt; mild gt; moderate gt; severe; bulk density changes in the opposite. Soil water content under each treatment are significant seasonal differences; bulk density of the season under severe significant difference. 3 (0-30cm) of soil chemical properties: soil pH and organic carbon (20-30cm) with increasing grazing intensity increased organic carbon (0-20cm) and available P changes the contrary; impact of grazing intensity with the weakened by the increase of soil depth; mild significant reduction in the total N and available N. Mild and moderate no significant impact of organic carbon. The severe lower organic carbon, fast-acting N and fast-acting K; grazing intensity of total P, available P and full K does not significantly with; each treatment on the vertical distribution, in addition to the pH value and the full N respectively presented 10-20cm gt; 20 - 30cm gt; 0-10cm and 10-20cm gt; 0-10cm gt; 20-30cm, the rest are reduced with the increase of soil depth. Overgrazed, moderate, severe organic carbon (0-20cm) and pH value (0-30cm) seasonal differences significant; overgrazed, mild, moderate total N and available K in the 0-20cm season significant difference; No animal husbandry, under the fast-acting N (0-10cm), full-K (20-30cm) seasonal differences significantly with; quick impact P (20-30cm) and full-P (10-20cm), respectively, in mild and severe, with a significant seasonal differences. Livestock 4 individual daily gain decreased with increasing grazing intensity and the hectares of weight gain: Medium gt; severe gt; mild.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > General Animal Science > Grassland Science,prairie school
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