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《Acta Pratacultural Science》 1996-04
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Composition of Artemisia ordorsica Community and Primary Productivity of Component Species

Liu Jinxiang (Desert Research Institute, Chinese Academy of Sciences, Lanzhou 730000)  
The composition of Artemisia ordorsica community was characterised by: the primary productivity of A. ordorsica on average accounted for 71. 86% of that of the community, Sophora alopecuroides 10. 77% and other herbs 17. 37%. The peak in the productivity of the community during the growing season occurred usually when the peaks took place for S. alopecuroides and other herbs. The above percentages of relative productivity varied through the growing season for individual component species, showing a pattern of parabola-shaped curve for A. ordorsica, a single-peak curve for S. alopecuroides and a twin-peak curve for the category of other herbs. Also, the monthly changes in the primary productivity of the latter two components significantly correlated with the rainfall pattern, and hence they could be described by regression models.
【Key Words】： Artemisia ordorsica community primary productivity population dynamics regression model
【CateGory Index】： S812
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