古尔班通古特沙漠西部梭梭大面积退化原因

通过对退化梭梭种群特征、土壤理化性质、地下水位等调查,分析了古尔班通古特沙漠西部梭梭退化的原因。结果表明:研究区多为极重度盐渍化土壤,梭梭林分稀疏,平均盖度为11.58%,幼苗更新极少,种群处于衰退状态;梭梭生活力(单株梭梭活枝与枯枝数量之比)与表层土壤(0～40cm)、中层土壤(40～80cm)电导率存在极显著负相关(r=-0.79,P=0.0000;r=-0.32,P=0.009),与下层土壤(80～120cm)含水量存在极显著正相关(r=0.54,P=0.000);梭梭种群存活指数(样地活株与死株之比)及盖度均与地下水位埋深呈极显著负相关(r2=0.40,P=0.007;r2=0.46,P=0.004)。表明,地下水位降低、土壤水分匮缺以及土壤盐分含量过高是梭梭退化的主要因素。

Cause of large-scale Haloxylon ammodendron degeneration in west Grurbantonggut Desert

Based on the investigation of the characteristics of degenerated Haloxylon ammodendron populations,soil physical and chemical properties,and groundwater level in west Gurbantonggut Desert,a cause analysis was made on the degeneration of H.ammodendron in the area.In the study area,most of the soils were heavily salinized,and the trees and seedlings were sparse,with an average coverage being only 11.58%.The age structure diagram indicated that the H.ammodendron populations were in declining.There was a signif...