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《Acta Botanica Boreali-Occidentalia Sinica》 2007-05
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The Principal Component Analysis of Soil and Population Growth Status of Artemisia sphaerocephala in Arid Region of Alex Desert

MA Bin,ZHOU Zhi-yu,ZHANG Li-li,GAO Wen-xing(College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China)  
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 2.1 seedlings/m2,the growth status was best.
【Fund】: 国家自然科学基金西部环境研究资助项目计划(90102011);; 国家重点基础研究发展规划资助项目(G2000048705);; 国家自然科学基金重点项目(39730100);; 甘肃省科技攻关项目(2QS041-C31-20)
【CateGory Index】: S793.9
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