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Study on Slope Erosion Differentiation Law and Control Measures in Desert Grassland

Author: MengZhongJu
Tutor: GaoYong
School: Inner Mongolia Agricultural University
Course: Soil and Water Conservation and Desertification Combating
Keywords: Desert steppe Wind erosion Water erosion Water Land cover Supplementary irrigation
CLC: S157
Type: PhD thesis
Year: 2010
Downloads: 121
Quote: 2
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Abstract


With the variability of the global environment, accompanied by a the human strong negative interference, making the desert steppe of northern China already fragile varying degrees of degradation, desertification. Desert steppe Xilamuren study using the method of combining field regular observations and artificial system of slope habitat differentiation characteristics; focuses on the slope of wind and water erosion characteristics related mechanism analysis; there for erosion of the slope of the face-bit Remediation of sexual conduct, and the late Paul the water suppression eclipse effect were discussed, the main conclusions are as follows: (1) the slope at the top surface roughening is more serious, more coarse content of fine particles decreased significantly; soil particle distribution of the fractal dimension and the contour toward showing certain laws, with the terrain from high to low, the fractal dimension of soil particles from small to big, particle fractal dimension and sand content was significantly negatively correlated with stick The clay content was significantly positively related. Soil texture conditions have a very important impact on soil organic matter, different slope positions due to the differences of the vegetation cover, leading to the crest of fine particulate matter and organic matter content; organic matter content and coarse sand was significantly negatively correlated with silt content was a significant positive correlation. (2) the different spatial scales, soil moisture by different factors, low-lying areas with better spatial continuity and its base soil 0-30 cm of the soil water content, slope, moisture content generally patchy uneven distribution water distribution pattern of spatial continuity of the poor; low-lying land, its base soil's water supply, water-holding performance is superior to the top of the hill; infiltration rate performance as the top of the hill gt; slope gt; its base gt; lowlands, soil early beginning moisture content, total porosity and soil compaction significant correlation with the presence of soil infiltration rate, Horton infiltration equation can better reflect the desert steppe soil water infiltration process. (3) there is a big wind erosion intensity spatial difference, the amount of wind erosion from the slope at the top to the lower descending order; vegetation cover and the amount of soil erosion by wind power function of correlation. Effective anti-wind erosion grassland surface vegetation cover of 60%; negative relationship between the surface moisture content and wind speed; sediment load increased wind speed increases. Vegetation cover, wind speed and soil moisture content of 3 impact factor of sediment there are varying degrees of interaction, the interaction of wind and vegetation cover the main effect of the standardized regression coefficient absolute value maximum wind speed and soil moisture interactions, followed The smallest is the interaction of soil moisture and vegetation cover. (4) surface runoff highest pre silt content, occupy collected 69.06 percent of the total weight of the sediment, soil loss is mainly in the the the slope early production flow, loss of sediment sand content is higher in the early runoff, silt, clay content in the latter part of the runoff increased significantly; relationship between runoff sediment concentration and antecedent soil moisture was similar to a quadratic equation parabola, the desert steppe slope soil erosion least preliminary optimal soil moisture value of 17.5%. Vegetation cover can reduce surface runoff diversion effect of the vegetation is mainly early in the runoff. The (5) treatment aquasorb, to varying degrees, the water-holding capacity of the soil decreased ability release moisture, soil erosion gradually decreases with the increase in the amount of aquasorb. Litter, gravel covering the effects of sediment reduction with significantly less water; supplementary irrigation for plant growth promoting effect.

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