荒漠草原土壤健康评价

Evaluation of soil health in desert grassland

文中以西鄂尔多斯自然保护区东部的荒漠草原棕钙土为研究对象,通过野外调查与室内分析,从与土壤健康有关的物理、化学、生物学指标中筛选出具有代表性和敏感性的评价指标,建立了土壤健康评价体系,并采用模糊综合评价法对不同退化程度荒漠草原土壤的健康状况进行了分析,主要研究结果如下:1)根据植被数据的分析结果把研究区划分为未退化、轻度、中度、重度四个退化等级;2)通过主成分分析法筛选出对放牧较敏感的8个荒漠草原土壤健康评价的指标;3)用模糊数学方法对荒漠草原土壤健康状况进行综合评价,未退化区土壤差异性健康综合系数为1,轻度退化区为0.9079,中度退化区为0.6789,重度退化区为0.5949。健康土壤评价系数为(l-0.90),亚健康土壤评价系数为(0.89-0.65)和不健康土壤评价系数为(0.64-0)。未退化区、轻度退化区土壤为健康土壤,中度退化区土壤为亚健康土壤,而重度退化区土壤为不健康土壤。

In this study, we evaluated soil quality of desert steppe in Ordos＇ Etuokeqi natural reserve, Inner Mongolia, and established a system for soil health assessment. The results were as follows ： 1 ） According to the analysis of vegetation data, the study area was divided into four grades： non degradation, light degradation, moderate degradation, severe degradation. 2） Based on principal composition analysis, eight indicators sensitive to grazing was screened to evaluate the health condition of desert - grassland soil. 3） A comprehensive evaluation was conducted by using Fuzzy cluster. The health coefficient in non - degraded soil was 1, light - degraded soil was 0.9079, moderate - degraded soil was 0. 6789, and severe - degraded soil was 0. 5949. The range of soil health evaluation coefficient was 1 - 0.90, the sub - health soil was 0.89 - 0.65, and the unhealthy soil was 0.64 - 0. The soils in non - and mild - degraded areas were healthy, soil in moderate - degraded area was sub -healthy. and the soil in severe -degraded area was unhealthy.