黄土高原中部草地群落初级生产

在各类草地群落初级生产基础上，综合对比分析了黄土高原中部草地群落初级生产，主要表现在以下方面：草地群落初级生产及其与水热条件的关系；净生产量的季节变化；同化器官与非同化器官初级生产的数量关系；不同等级牧草的数量关系；地下初级生产变化与建群种物候关系等方面。

The Primary Production of Grassland Community in Centrial Region of Loess Plateau

On the base of primary production of different grassland community, the primary production of grassland community is studied in central region of loess plateau.The principal content is the relationship of the primary production and water heat of grassland commuity in central region of loess plateau, the seasonal variation of the net primary production, the quantitive relationship of primary production of the assimilating and non assimilating organs, The quantitive relationship of different grodes of pasture,the mutual relationship in between variation of underground primary production and the phenophase of costructive species, etc.