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《ACTA BOTANICA BOREALI-OCCIDENTALIA SINICA》 1998-01
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STUDY ON DYNAMIC STATE OF PRIMARY PRODUCTIVITY IN ARTEMISIA ORDORSICA COMMUNITY

Liu Jinxiang,Qu Baomin and Zhang Zhiqian ( Institute of Desert Research,Academia Sinica ,Lanzhou 730000)Wu Yanlong ( The Station of Grassland ,Yanchi Country 751500)  
The primary productivity per year varies from 465.45 kg/hm 2 to 912.15 kg/hm 2.According to the variation of annual precipitation (particular the rainfall from October last year to April this year and the rainfall in July),soil moisture in April and May,air temperature and evaporation in June of growing season in Artermisia ordorsica community,the primary productivity can be calculated in advance through regression analysis for the single factor.Dynamic state of the accumulated primary productivity is in conformi ty with in single peak value.It can be devided into two models of “slowly increasing model and fast increasing model” which fit in with the Logistic equation and the anti function equation,respectively,in the growing season.Attenuation curve of the primary productivity have the shape of “Hypotenuse” and the attenuate rate decreases remarkably compared with the accumulated rate in the non growing season.
【Key Words】: Artemisia ordorsica comunity primary productivity precipitation and cumulative temperature regressionmodels
【CateGory Index】: Q949.783.5,
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