宁夏沙坡头地区人工固沙植被种间水分竞争的初步研究

PRILIMINARY STUDY ON THE PLANT INTERSPECIFIC COMPETITION FOR WATER IN THE ARTIFICIAL SAND-BINDER VEGETATION IN SHAPOTOU AREA,NINGXIA

本文通过研究沙坡头地区人工固沙植被中油蒿（Ａｒｔｅｍｉｓｉａｏｒｄｏｓｉｃａ）和柠条（Ｃａｒａｇａｎａｋｏｒｓｈｉｎ－ｓｋｉｉ）对环境资源利用（包括时间、空间和水资源）所表现出的不同生长状况和生理生态特性，阐明了环境条件的动态变化，尤其是沙地表面结皮的形成、降水入渗浅层化对固沙植物水分利用与竞争的重要影响。结果表明，油蒿以其较强蒸腾耗水能力和根系的浅层密集分布，在与柠条的水分竞争中占据优势，能够更好地利用作为唯一水分来源的降水补给。

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.