黄河阶地植物群落演替及物种多样性研究

河流不同阶地的地形和形成年代具有较大差异,对该地区的植物群落物种组成、多样性和生产力等群落结构和功能造成很大影响.以流经青藏高原玛曲段黄河的3级阶地为研究对象,调查了不同阶地对高寒草甸植物群落的影响.结果显示:1)3级阶地上的土壤水分状况不同；2)3级阶地上植物群落的物种丰富度、多度、多样性、均匀度都有相似的发展趋势,即第3级阶地＞第2级阶地＞第1级阶地(P＜0.01)；3)第1级阶地的植物群落和第2级阶地的植物群落相似性较高,而第1级阶地和第3级阶地之间的植物群落差异性较大；4)第1级阶地和第2级阶地上植物群落的地上生物量没有显著差异,但都比第3级阶地上植物群落的地上生物量小(P＜0.05).

Study on Community Succession and Biodiversity of Plants in Terrace of Yellow River

There were great differences between topography of different terraces and formation time of river and had great influences on community structure and function such as plant community species composition,species diversity and productivity.Taking three stage terrace of Yellow River in Maqu of Tibetan Plateau as research object,the investigation was carried out on influences of different terrace on plant community of alpine meadow.The results showed: 1) Soil water status of three stage terrace were different.2) The species richness,abundance,diversity,and community evenness followed the similar development trends,and the third stage terrace > the second stage terrace >the first stage terrace(P < 0.01).3) Plant communities of the first stage terrace and plant communities of the second stage terrace had higher similarity,while there was a big difference between plant communities of the first stage terrace and plant communities of the third stage terrace.4) There were no obvious differences between aboveground biomass of plant communities of the first stage terrace and plant communities of the second stage terrace,aboveground biomass of plant communities of the first stage terrace and the second stage terrace were lower than the third stage terrace(P < 0.05).