紫色土不同土体的土壤肥力综合评价

采用专家系统建立了土壤肥力综合评判体系,应用模糊综合评判方法对不同土体的肥力进行了综合评判。评判结果表明,不同质地层次的土体均为可级,不同培肥土体均为优级。以综合评价总分,比较了不同土体肥力的优劣。简要分析了不同土体肥力差异的原因。由此为紫色土改良、防治其退化提供了科学依据。

COMPREHENSIVE EVALUATION OF FERTILITY IN DIFFERENT PEDONS OF PURPLE SOILS

Determined by expert system, the comprehensive evaluation indexes to evaluate the fertility of purple soils were proposed, scaled, and the weight distribution of the indexes was established. and finally the comprehensive evaluation system to evaluate the fertility of purple soils were set up. The fertility in different pedons of purple soils was evaluated by means of fuzzy comprehensive evaluation.The results indicated that the soil fertility of pedons of different textural solums reached moderate level, and that of pedons of different fertilized solums reached good level.According to the total critical values, the fertility levels were ranges as:loam soil fertilized in lower layer>loam soil fertilized in whole solum>loam soil fertilized in upper layer>sandy soil fertilized in whole solum>sandy soil fertilized in lower layer>sandy soil fertilized in upper layer>loam soils in whole solum>soils of loam in upper layer and sand in lower layer>soils of sand in upper layer and ioam in lower !ayer>soils of whole solum of sand. The results contribute to prevention of degradation in purple soils.