金马河温江段河岸带不同生境草本群落物种多样性和生物量变化研究

本研究以金马河温江段河岸带植被为研究对象,采用典型样地法对5种生境（河滩地、砾石地、芦苇地、斑茅地和沙坑地）进行调查,分析其3年来（2015-2018年）植被群落特征变化。结果表明：从时间尺度上看,2015年仅有草本层32科80属113种,2018年草本、灌木层共计57科118属161种,各生境草本层优势种变动较小,物种多样性指数值增大,地上、地下生物量变化情况为河滩地和沙坑地增加,砾石地和芦苇地变化不明显,斑茅地减少;从空间尺度上看,2015年各生境之间的物种多样性指数和地上生物量均不存在显著差异,而2018年各生境间变异程度复杂;该段河岸带3年间取得了一定程度的生态恢复效果,但芦苇（Phragmites australis）、葎草（Humulus scandens）呈扩张趋势,需要注意控制生长,维持生境物种多样性。

Research on Species Diversity and Biomass Variation of Herbaceous Community in Different Habitats in Wenjiang section of Jinma River

In order to analyze the variation of community characteristics in Wenjiang section of Jinma River in the past three years (2015-2018),the vegetations in five habitats (Flood land,Gravel land,Reed land,S. arundinaceum land and Sand land) were investigated by typical sampling method. The results showed that:In terms of time scale,only 113 species of herbs belonging to 80 genuses and 32 families were found in 2015,while 161 species of herbs and shrubs belonging to 118 genuses and 57 families were found in 2018. The dominant species of herbaceous layer in each habitat remained unchanged,however,the species diversity index increased since 2015. The variation of aboveground and belowground biomass of the Flood land and the Sand land increased,while that of the gravel land and reed land did not change,and that of S. arundinaceum land decreased;On the spatial scale,there were no difference in the species diversity index or aboveground biomass of each habitat in 2015,while in 2018,the variation degree of among habitats is complex;The ecological systems in riparian zone of this section has recovered in a certain degree,but Phragmites australis and Humulus scandens are expanding,so attention should be paid to controlling their growth,so as to maintaining the diversity of habitat species.