摘要
群落稳定性是生态系统的关键属性之一,对维持湿地生态系统的结构与功能有至关重要的作用。采用鄱阳湖典型洲滩湿地植被的实地调查数据,通过改进的M.Godron法以及Shannon-Wiener、Pielou指数研究了典型洲滩湿地植物群落稳定性与多样性在不同水情阶段的变化特征,并探讨了两者间的相关关系。结果表明:(1)芦苇—南荻(Phrag-mites australis-Triarrhena lutarioriparia)群落的Shannon-Wiener指数和稳定性都显著高于狗牙根(Cynodon dactylon)群落(p<0.05),两个群落的Pielou指数无显著差异(p>0.05)。物种多样性和稳定性在不同水情阶段的变化不同,狗牙根群落的物种多样性在各阶段无显著差异,而群落稳定性在丰水期明显低于其他时段;芦苇—南荻群落的物种多样性在涨水期和丰水期较高,而群落稳定性在退水期和枯水期较高;(2)群落稳定性和物种多样性没有明确的关系,物种多样性不是群落稳定性的决定因素;(3)不同植物群落稳定性对土壤水分存在不同的最优区间,当土壤含水量在15%—20%左右时,狗牙根群落稳定性最高,而当土壤含水量在35%—40%左右时,芦苇—南荻群落稳定性最高。结果有助于了解鄱阳湖典型洲滩湿地植物群落的稳定性及变化规律,也对进一步揭示水情变化影响下鄱阳湖湿地植物群落的演替规律及生态系统稳定性变化具有重要的支撑作用。
Community stability is one of the key attributes of the ecosystem,and it is considered to be important for wetland ecosystem structure and function.Based on the field survey data of the typical wetland vegetation in Poyang Lake,the characteristics of the changes in stability of typical wetland plant community and its species diversity under different water regimes were studied through the modified M.Godron method,Shannon-Wiener index and Pielou index,and the correlation between community stability and plant diversity was also discussed.The results show that the Shannon-Wiener index and stability of the Phragmites australis-Triarrhena lutarioriparia community were significantly higher than those of the Cynodon dactylon community(p<0.05),whereas Pielou index did not differ between communities(p>0.05).Species diversity and community stability changed differently at different stages of water regimes.There was no significant difference in the species diversity of the Cynodon dactylon at each stages of water regimes,while the community stability in high water period was significantly lower than that in other periods.There was no clear relationship between community stability and species diversity,and species diversity was not the determinant of community stability.The stability of different plant communities had different optimal intervals for soil moisture content,when the soil moisture content was about 15%-20%,the stability of the Cynodon dactylon community was the highest.However,when the soil moisture content was around 35%-40%,the stability of the Phragmites australis-Triarrhena lutarioriparia community was the highest.These results are helpful to understand the stability and the change rule of the stability of plant community in typical wetland of Poyang Lake.It also plays an important role in further revealing the succession law of wetland plant communities in Poyang Lake and the changes in the stability of ecosystem under different water regimes.
作者
薛晨阳
李相虎
谭志强
李珍
XUE Chenyang;LI Xianghu;TAN Zhiqiang;LI Zhen(Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《生态科学》
CSCD
2022年第2期1-10,共10页
Ecological Science
基金
国家重点研发计划项目(2018YFE0206400)
国家自然科学基金项目(41871093)。
