中国东北样带羊草群落植物水分生态类型功能群生物量变化研究

初步分析了中国东北样带以羊草（Leymus chinensis）建群种或共建种的草原群落植物水分生态类型功能群生物量及其与群落初级生产力和环境变化的关系。结果表明：中旱生植物对群落初级生产力起主要决定作用，其次是旱中生植物和旱生植物，中生植物在羊草杂类草草甸群落中作用较大，而湿生植物只是个别类型的偶见种。中旱生植物和旱生植物生物量的变异系数较低，分别为0．54和0.72，具有较高的稳定性。

Study on Biomass Changes of Plant Ecological Type Groups in the Leymus chinensis Communities along Northeast China Transect

Plant function types are basic unit in studying vegetation changes and ecosystem function of biodiversity.By now,there has not been a widely accepted class of plant function types.We analyzed the relations of plant ecological type groups and community biomass and environment changes in the grassland communities of Leymus chinensis as edificator along Northeast China Transect(NECT).The results showed that the primary productivity of Leymus chinensis communities was decided first by Xero-mesophytes,and next by Meso-xerophytes and Xerophytes.Mesophytes played an important role only in Leymus chinensis and herbage community.Hygrophytes appeared in several communities.The variance coefficients of Xero-mesophytes and Xerophytes were lower than those of other ecological type groups,therefore the stability of Xero-mesophytes and Xerophytes biomass was higher.