中文摘要：

应用主成分分析方法研究了阿拉善荒漠区白沙蒿飞播区土壤因子和白沙蒿生长状况,阐明了土壤性质的主要限制性因子和群落生长最主要的状况指标。结果表明：（1）各个土壤因子中,6月的土壤含水量是各土壤性质中最重要的因子,贡献率达到63.6%。土壤的分形维数也对土壤性质有重要作用,贡献率为8.8%。土壤中N、P、K含量的贡献率分别为5.4%、3.5%、3.5%,也是不容忽视的影响因子。（2）地上生物量最能反映植株的生长状况,其贡献率达到60.1%,而且和几种最主要的土壤因子都有极高的相关性。（3）对土壤因子的第一和第二主成分的排序结果显示,不同白沙蒿种群密度分为3个类型,而种群密度在2.1株/m2时,种群生长状况最佳。

英文摘要：

Soil factors and growth status of Artemisia sphaerocephala population of airplane planted region in Alex Desert were investigated by the principal component analysis to find primary limit factors of soil status and dominant index for population growth. The results showed that （1） among all soil factors the crucial factor was the water content of 0-20 cm layer soil in June,the proportion of which was 63.6%. Fractal dimension of soil,the proportion of which was 8.8% ,had important effects on soil status. Furthermore,the proportion of concentrations of N,P,K in soil were 5.4%,3. 5% and 3.5% respectively and could not be ignored. （2） The most suitable factor for reflecting growth status was biomass of aboveground,the proportion of which reached to 60. 1% and have significant correlation between all the primary limit factors of soil status described above. （3）Through arrangement of all the points by the first component and the second component, A. sphaerocephala populations with different population density could be sorted into three groups. When the population density was 2.1seedlings/m^2 , the growth status was best.