辽西沙化地区主要植被类型土壤抗剪强度研究

Study on soil shear strength of main vegetation types in desertification area of western Liaoning Province

选取辽河流域辽西沙化地区受风水侵蚀的5种不同植被类型与裸地作为研究对象,分析不同植被类型对土壤抗剪强度的影响。结果表明:5种植被类型和裸地土壤抗剪强度由大到小依次为乔灌混栽林、灌木林、草地、乔木林、裸地、农田。乔灌混栽林较灌木林土壤抗剪强度提高了6%,较裸地土壤抗剪强度提高了29.31%。由于频繁耕作等原因,农田土壤抗剪强度较乔灌混栽林降低了31.6%,较草地土壤抗剪强度降低了26.03%。乔灌混栽林土壤抗剪强度最高,是土壤有机质、植物根系和土壤团聚体共同作用的结果。

Soil shear strength is a generally accepted comprehensive indicator characterizing soil erosion resistance.In this study,we selected five types of vegetation covered lands and bare land as the research objects in the desertification area of western Liaoning Province and analyzed the effect of different vegetation types on soil shear strength.The result showed that the shear strength of five types of vegetation and bare soil from high to low were arbor-shrub mixed forest,shrub forest,grasslands,arbor forest,bare land,farmland.The soil shear strength of arbor-shrub mixed forest was 6%higher than that of shrub land and 29.31%higher than that of bare land.The shear strength of farmland and grassland were 31.6%and 26.03%lower than that of arbor-shrubs mixed forests respectively,because of frequent farming.Arbor-shrubs mixed forest has the highest soil shear strength because of the interaction of soil organic matter,plant roots and soil aggregates.