河西走廊中段荒漠植被组成及土壤养分空间分布特征OA北大核心CSTPCD

Desert vegetation is an important ecological protection barrier for oasis ecosystems in the Hexi Corri-dor.Studying the composition of desert vegetation and the spatial distribution of soil nutrients is important to the construction and management of desert-oasis transition zone vegetation.This study is based on several field sur-veys.Traditional statistical and geostatistical methods were used to investigate the composition of desert vegeta-tion and soil nutrient characteristics in the middle section of the Hexi Corridor and the southern fringe of the Ba-dain Jaran Desert,and their correlation with environmental factors were analyzed.Results indicated that the plant composition in the desert areas of the middle section of the Hexi Corridor and the southwestern fringe of the Ba-dain Jaran Desert was single and had low diversity,with plant species concentrated in a few families.Typical des-ert plants such as Reaumuria songarica and Nitraria tangutorum were frequently found in the study area.The dis-tribution of herbaceous plants was strongly correlated with the average annual precipitation.In Shandan County,which is located in the southern part of the study area,the biomass of herbaceous plants reached 108.01 g·m-2.Within a certain range of annual precipitation,the biomass of shrubs increased with the increase of precipitation,with the highest value occurring in Suzhou County,near the northern slope of the Qilian Mountains,at 134.03 g·m-2.Increasing precipitation significantly promoted the growth of herbaceous plants.The surface soil had the highest organic carbon,total nitrogen,and total phosphorus contents in the study area,with average values of 2.12,0.25,and 0.41 g·kg-1,respectively,and higher levels of variability than those in the soil subsurface.In the horizontal di-rection,the three types of soil nutrients had high variability and weak spatial autocorrelation,with maximum val-ues of 11.22,1.30,and 0.73 g·kg-1 near Zhangye Oasis.Principal component analysis showed that soil properties and precipitation were the primary factors causing habitat differences in the study area.However,different envi-ronmental factors interacted with one another to jointly drive desert vegetation composition and distribution.