喀斯特石漠化评价指标体系探讨——以贵州省为例

A STUDY ON ROCKY DESERTIFICATION EVALUATION INDEX SYSTEM ——A Case Study of Guizhou Province

从喀斯特石漠化的科学内涵出发,探讨喀斯特石漠化评价的具体内容,指出喀斯特石漠化评价应从现状、危险性以及发展速率3个方面进行。评价指标选取所依据的原则,探讨了指标体系适用的时、空尺度范围;根据已有研究成果,分析喀斯特石漠化不同等级指标量化界线确定的生态基准,初步建立了石漠化评价的指标体系。

The contents of rocky desertification assessment are discussed in detail according to its connotation. It is thought that Karst rock desertification is estimated through three factors including practical status, dangerous degree and rate of development. The choice of evaluation index has four principles, which are systematic, representative, quantitative and easily-acquired of information. The boundary of each index can be set according to the ecological base plan and ecological environment condition in different areas. Evaluation index system of rock desertification has been preliminarily established. The present condition of rock desertification can be reflected by vegetation cover ratio, rock bareness ratio, regolith thickness and vegetation types. The indexes of rock desertification hazard involve the factors of gradient, lithology, physiognomy, sloping field ratio and population density, which reflect society pressure. The indexes of evolvement rate of rock desertification are based on carefully analysis on condition of rock desertification.