Functional traits of major herbaceous plants in the hydro-fluctuation belt of the Three Gorges Reservoir
Gao Ting;Chen Miao;Dang Cheng-qiang;Huang Hui-min;Dong Rong;Tao Jian-ping;Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education),Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region,School of Life Science,Southwest University;
The environmental heterogeneity of the hydro-fluctuation belt in the Three Gorges Reservoir is illustrated by the fact that each elevation corresponds to a different time and depth of water submergence.We analyzed seven plant functional traits in 37 major herbaceous species from three sample sites in the reservoir hydrofluctuation belt.We then divided the plant species into different groups(including different life forms and different plant families)and analyzed variations in their functional traits.To determine growth and resource utilization adaptability of plants located in different elevation belts,we analyzed the plant functional traits and trait correlations at different elevations(corresponding to different water environments).We identified four particular traits in the results.1)Leaf dry matter content(LDMC)and fine root tissue density(FRTD)of perennials were significantly higher than those of annuals and biennials(P0.05).In addition to specific leaf area(SLA),significant trait differences were found among different plant families(P0.05).2)With a reduction in elevation,the average SLA and specific root length(SRL)of plants first decreased and then increased,while plant height(H)and dry matter content of leaves and stems showed a trend to decline.3)Taking all plant species into account,there were significant positive correlations between stem dry matter content(SDMC),H,LDMC,and FRTD(P0.05).By contrast,SRL and specific root area(SRA),both fine root traits,were negatively related to H,SDMC,and FRTD(P0.05).4)There was convergence in plant traits among different elevation belts.The study showed that different herbaceous plant groups generate various trait combinations to adapt to the environment.Plants growing in lower elevation habitats have a low investment and quick recovery growth strategy,and vice versa.The plant trait correlation convergence among different elevation habitats implies a convergent adaptation of herbaceous plants in the hydro-fluctuation belts of the Three Gorges Reservoir.
【CateGory Index】： Q948
【CateGory Index】： Q948