羊草草原群落初级生产力动态研究

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B_t＝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。

Studies on Dynamics of Primary Production for Leymus Chinensis Steppe Community

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, B_t = 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.