Impact On Soil Anti-erosion And Soil Anti-scour By Vegetation And Litho Logical Character In The Center Area Of Guizhou

In this research,Soil has been taken as the object of study under the karst area typical vegetation as well as from this area mainly becomes the earth mother rock dolomite,the limestone, the gray matter dolomite,the feldspar silicarenite,the purple sandstone and the purple shale in the center area of Guizhou.Through field work,soil sample gathering and indoor analysis,soil anti-erosion and soil anti-scour has been analyzed in the experiment.Systematic study of the vegetation and the lithology character impact on soil anti-erosion and soil anti-scour with a view to provide a theoretical basis for preventing and controlling soil erosion as well as preventing desertification.The results indicated:the soil anti-erosion under different vegetation in the karst area of the whole,the woodland＞the grass vegetation-based;in the forest,broad-leaved forest＞shrub land＞coniferous woodland.Surface and subsurface soil changes of the basic agreement.The anti-eclipse index analysis indicated that the soil anti-disintegration and the time dynamic relation most superior mathematical model is two polynomial functions,suits in this region each planter by under soil corrosion resistance can estimation.Under the different vegetation's soil impact resilience performance for reduces gradually from the forest land to the wild grassy slope,the broad-leaf forest land is highest;The surface layer soil's impact resilience must be bigger than the subgroup soil;Along with slope increase,the soil impact resilience reduces gradually.Under the different vegetation's soil's is remarkable under identical slope impact resilience difference,and along with slope enlargement,the difference significance increases gradually.To the soil surface layer of the impact of the variation in the three woodland on the slope is obviously greater than grassland.In this area the soil constitutive property and the soil corrosion resistance and the impact resilience become the obvious linear relationship,relates is best by two multinomial fitting,the correlation coefficient and the regression analysis has achieved 0.01 extremely significance level.Principal component analysis of six kinds of lithology to the corrosion resistance of the soil, access to comprehensive evaluation of exponential function:Y=0.611Y₁+0.238Y₂+0.151Y₃,by order of the corrosion resistance of strength:gray dolomite＞Limestone＞purple shale＞dolomite＞feldspar quartz sandstone＞purple sandstone.Corrosion resistant and the soil bulk specific gravity, the sand grains,in the soil particle composition's silt content,assume the remarkable correlational dependence.Six kinds of soil lithology impact of the same strength and corrosion resistance in the same slope under the impact of significantly with increasing slope,this significant difference is gradually increasing impact of change the largest is feldspar quartz sandstone and purple sandstone of the soil.Six kinds of soil scour and lithologic density,sand clay,silt clay content, Soil aggregation condition,soil aggregation degree,dispersion rate and dispersion coefficient was significantly but the organic matter content and water stable aggregate content relationship is not significant.Soil anti-erosion and corrosion resistance of the strength of the line strength.Soil anti-erosion coefficient(Z) characterization of soil erosion and using sand clay(＞0.05mm) content (a),aggregation degree(b),dispersion coefficient(c) Characterization of the corrosion resistance of the soil,which is correlation equation:Z=-0.072a+0.008b-0.007c+1.544.