关键词: 喀斯特峰丛洼地, 土壤养分, 有机质, 凋落物质量, 阳离子交换量

Abstract: The vetiver eco-engineering, difined as planting vetiver grass(Vetiveria zizanioides)with local species of trees, shrubs, herbs and lianas by simple necessary engineering structures, is used to control soil erosion and rehabilitate degraded environments. All experiments and applications indicated that the vetiver eco-engineering provided better slope stabilization, environment mitigation and beautification than just vetiver was planted alone. For dozens of years, almost all studies and observations on vetiver grass(Vetiveria zizanioides)have indicated that the perennial had wide adaptation to the environment and strong resistance to adversity. Apart from its great success as a biological measure of soil and moisture conservation, the vetiver eco-engineering also has a multitude of other excellent functions. It can increase nutrients and moisture in soil,improve agricultural micro-climates, recover deteriorated eco-systems, and ameliorate polluted lands. Therefore, extending the vetiver eco-engineering, particularly in mountain villages, is an efficient measure for realizing the rural sustainable development. It has been testified that agricultural ecosystems, in which vetiver is acted as a pivot, may produce tangibly ecological, economic and social benefits. Obviously, the vetiver eco-engineering has wide application prospect for soil and moisture conservation and for establishing complex eco-agriculture in the tropics and subtropics as well as in mountainous areas of southern China. However, in order to popularize,develop and utilize this measure, it is necessary to ensure the newly biological technique.

Key words: Karst peak-cluster depression, soil nutrient, soil organic carbon, litter quality, CEC.