羊草草原群落初级生产力动态研究

Studies on Dynamics of Primary Production for Leymus Chinensis Steppe Community

在锡林郭勒盟南部羊草草原对群落初级生产力动态进行11年的定位研究，结果表明：群落地上生物量有着显著的波动，在11年中遇丰年3个、平年7个、欠年1个。群落地上生物量季节积累动态符合Compertz曲线Bt＝B（max·e(-ea-kt)），其高峰值出现在返青后的125．2～162．7天。制约群落地上生物量波动的限制因素是水分条件。建立了群落地上生物量与水热因子关系的数学模型。根据这些规律作者对畜牧业生产提出了合理建议。

Dynamics of Leymus chlviensis steppe community primary production were studied in southern Xilinguole Steppe region during eleven years from 1983 to 1993. Results showed that fluctuations of the community above-ground biomass were remarkable. During eleven years there were three bumper harvest years,seven average years, and one shortfall year. Seasonal increasing curves of the community above - ground biomass conformed to Compertz curves, Bt = B(max· e(-ea-kt). The peakvalues came 125. 2 to 162. 7 days after herbage turnning green. The main factor that affects fluctuations of the cornmunity above-ground biomass is precipitation. Mathematical models of the relationship between the community above-ground biomass and the accumulated precipitation and cumulative temperature were founded- Some rational suggestions on animal production according to the comrnunity primary production were put forward.