重庆岩溶山地土地类型及其评价

Land types and evaluation on karst mountain regions of Chongqing

较为准确地确定土地生态系统的退化恢复程度是生态恢复的基础和前提。本文选择重庆市有代表性的典型岩溶山地生态系统,利用分层聚类分析确定了不同土地利用方式下生态系统的生态退化恢复程度。结果表明,重庆岩溶山地土地生态系统按土壤属性与植被条件的退化恢复程度可分为4种类型,次生林地的生态状况都有所恢复,而大面积存在的石灰岩荒草坡与重庆石灰岩山地的顶极植被相比,其退化程度是严重的。为植被生态系统的恢复与重建提供了理论依据。

Exactly measuring the degradation degree of land ecosystem is the basis and precondition of restoring ecosystem. In this paper, quantitative classification method was used to study the degradation degree of ecosystem in karst mountain areas of Chongqing city, which was measured by the degradation degree of plots under different land use patterns. The results shows that the land ecosystem degradation types may be divided into 4 types according to soil fertility and vegetation status, and all the secondary woodland's ecological status were rehabilitated in some degrees than the barren karst grass hills,which distributed in a large area compared with the primeval vegetations. The measurement of soil quality and ecological state degradation degree of barren grass hills and woodlands provided theoretical basis for ecology restoration practice of the limestone barren hills.