塔里木河下游阿拉干断面胡杨林空间分布特征及其影响因素

Spatial distribution of Populus euphratica forests on Argan section in the lower reaches of Tarim River and its influencing factors

通过小尺度生态监测与遥感数据分析获取塔里木河下游荒漠河岸林现状信息,集中对阿拉干断面设立的100hm2长期监测样方内的胡杨树进行了详细的调查,对该断面胡杨林空间分布特征及其影响因素进行了分析。研究结果表明:塔里木河下游的胡杨具有伴河生长的特性;随着离河距离的增加,胡杨株数呈递减趋势;大部分胡杨主要分布在离河道200m范围内,且其分布都与离河道距离呈显著负相关关系;与此同时随着离河岸距离增加,胡杨的密度也同样呈现降低规律。不同地下水埋深条件下生长的胡杨总体状况显示,地下水埋深,即与河道距离的近远是影响胡杨分布最重要的因素之一。

According the data from ecological monitoring at small scale and remote sensing information of floodplain forests along the Arghan section in the lower reaches of Tarim River,Populus euphraticain an area of 100 hectares were investigated,spatial distribution of trees and its influencing factors were analyzed.The results of this study showed that Populus euphratica in the lower reaches of Tarim River have a tendecy to grow along the river bank,the number of trees decreases when the distance from the river increases.Most of trees are distributed within 200m from the river,there is a negative correlation between distribution of trees and distance from the river.The density of trees also drops with the increasing of distance from the river.The result of overall status of Populus euphratica under different groundwater depth showed that the groundwater depth（the distance from the river） is the major reason for the forest distribution in this study area.