油蒿群落种群分布及其初级生产力动态研究

油蒿群落种群分布特点是：油蒿居较大优势占群落初级生产力的７１．８５％，杂类草种群居第二位占１７．３７％，苦豆子居第三位占１０．７７％，其它杂类草及苦豆子种群峰值往往决定群落峰值出现的时间，就其相对重量而言，油蒿种群动态变化呈“抛物线”形曲线，苦豆子种群呈“单峰值”形曲线，杂类草则呈曲线的双峰值形曲线。

Composition of Artemisia ordorsica Community and Primary Productivity of Component Species

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.