侵蚀红壤肥力退化评价指标体系研究

对 6个不同土地利用方式条件下不同侵蚀程度的红壤退化试验小区土壤的物理、化学和生物学性质进行了测定 ,应用主成分分析法对 6个试验小区的红壤肥力退化进行排序和评价。通过对 16项土壤参评因子和 4项参评因子评价结果的比较 ,得出土壤有机质、水稳性团聚体、过氧化氢酶、微生物碳量 4项肥力因子已基本上反映了土壤肥力退化的综合状况 ,并建立了红壤肥力退化程度的评价指标方程 ,从而大大地简化了评价工作

Study on Evaluation Index System of Red Soil Degradation

The soil physical, chemical, and biological properties on red soil of six different erosion degree experimental plots were conducted by using the Main Component Analysis Method to evaluate red soil degradation. The results gained from the comparison between the arranged order of four indexes and the order of sixteen indexes show that these four indexes basically reflect comprehensive conditions of the soils. Eventually the index equation was set up according to the first main component. Therefor, the evaluation work can be simplized.