干旱区典型流域天然草地生态脆弱性评价研究

塔里木河流域是干旱区生态环境变化的敏感地区,其中塔河下游地区为严重脆弱地区,是典型的生态脆弱带和环境危机带.塔河下游地区广大的天然草地主要分布在绿洲-荒漠过渡带.依据有关生态脆弱带评价方法,结合塔河下游天然草地分布的实际状况,建立生态脆弱性评价体系.对垂直于塔河河道不同距离上的草地生态环境进行了分析,得出:(1)地下水位水质与河道距离具有一定的相关关系;(2)距离河道350 m是深根植物和浅根植物的分界线;(3)距离河道500 m以上地带的草地生态环境表现为中度生态脆弱,＜350 m的草地生态环境表现为一般脆弱等.

The ecological fragility appraisal of the natural meadow in a typical basin of arid area

The Tarim River Basin is one of the fragile areas of ecology of our country,and the downstream area of it is the most fragile area.The vast natural meadows of downstream area are mainly distributed over the oasis-desert intermediate zone.This paper establishes the fragility appraisal system of the ecology by the related ecology fragility appraisal method,according to the distribution of the natural meadow in the low reaches.By analyzing the meadow ecological environment with different distances perpendicular to Tarim River,this paper gets the following results:(1)There are some correlative relationships between the water table and the distance to riverway;(2)The distance of 350 m to riverway is the boundary of deep-rooted plants and shallow-rooted plants;(3) The region with the distance to riverway over 500 m represents a medium fragile region,while that with the distance below 350 m represents a general fragile region.