PRILIMINARY STUDY ON THE PLANT INTERSPECIFIC COMPETITION FOR WATER IN THE ARTIFICIAL SAND-BINDER VEGETATION IN SHAPOTOU AREA,NINGXIA
宁夏沙坡头地区人工固沙植被种间水分竞争的初步研究

n the artificial sand-binder vegetation in Shapotou area,Ningxia,Artemisia ordosicawas found to have quite different growing situations and ecological and physiological featuresfrom Caragana korshinskii that were reflected in using the environmental resources, in-cluding time,space and precipitation. Based on this,the important effects of the dynamicchange in environmental conditions,particularly the biocrust formation in sandy land surfaceand the infiltration ol precipitation getting more shallow layer of soil ,on the sand-biders inwater use and competition for water were dealt with in detail.The results showed that A.ordosica was superior to C. korshinskii in competition for water because A. ordosica hada stronger capacity of evapotranspiration and more shallowly distributed root systems touptake more water that could make better use of precipitation as a sole source of water.