农牧交错带荒漠化程度土壤评判指标的确定

以陕北农牧交错带的荒漠化土壤为研究对象,通过多元相关分析、回归分析和因子分析,确定了荒漠化程度的土壤评判指标。结果表明,评判土地荒漠化程度时,土壤物理性质指标应选择0.25~0.05 mm砂粒含量,土壤化学性质指标应选择土壤有机质含量,并运用这两个指标建立了荒漠化程度土壤评判指标体系,即通过荒漠化土壤表层0~20 cm上述两个指标的量值来评判荒漠化程度。

Determination of index for judging the desertification degree of land in the interlaced zone for farming and animal husbandry

Taken the desertification land of interlaced zone for farming and animal husbandry in North Shaanxi as the research subject ,through the correlation multi-analysis,the regression and the factor analysis,this paper defined a desertification soil degree judgment index. The result indicated that the soil physical property should choose the 0. 25-0. 05 mm sand grain content, the soil chemistry property should choose the soil OM in the process of degree judgment. Determination system of index for judging the desertification degree through 0-20 cm and surface was established.