格氏栲自然保护区22种常见木本植物的生态策略

Study on Ecological Strategies of 22 Common Woody Plants in Castanopsis kawakami Nature Reserve

植物的生态策略是影响群落构建结果的重要因子。以三明格氏栲保护区22种常见木本植物作为研究对象,探讨该区典型植物的生态策略组成、变化规律以及与群落构建结果的一致性,为解释该区植被的演变过程、系统功能变化提供理论依据。结果显示:1)22种常见木本植物的生态策略可分为七类,分别为C/CSR、CS/CSR、S/CSR、CS、S/CS、CSR和SR策略,其中CS/CSR和S/CSR策略为主导策略,所占比例分别达到34.1%和32.3%;2)两类主要的策略变化轴C/CSR-CS-S/CS和C/CSR-CS/CSR-S/CSR都表现为靠近C策略一端选择低构建成本快速收益,倾向于大比叶面积(SLA)与低叶干物质含量(LDMC)、单位面积碳(Carea)、氮(Narea)、磷(Parea)含量的性状组合,靠近S策略一端的性状组合则相反,选择高构建成本缓慢收益;3)与群落建立相关的策略方案,22种植物的竞争能力(C)和压力忍耐能力(S)与物种相对重要值显著相关,相对重要值高的物种压力忍耐力(S)较强。这意味着生境过滤效应使物种聚集S策略可能有更大的生存机会。与C和S策略相比,SR/CSR倾向于维持更快的投资回报和繁殖回报。综上所述,本区植物存在多种经济权衡,但高构建成本缓慢收益的压力忍耐型物种有着更大的生存机遇。

22 woody species were investigated in C.kawakamii reserve to understand composition and variation of strategies, and to test consistency with community assembly, which would provide theoretical basis for succession and ecosystem function. The results showed that :(1)22 woody species were characterized by seven strategies: C/CSR, CS/CSR, S/CSR, CS, S/CS, CSR and SR, among which CS/CSR And S/CSR strategy as the dominant strategy, accounting for 34.1% and 32.3% respectively;(2)Trade off between C/CSR-CS-S/CS and C/CSR-CS/CSR-S/CSR startegies axis performed similar trends. Plants clustered around C strategy exibited high SLA, low LDMC, Carea, Narea, Parea, but clustered around S strategy had opposite selection;Associated strategy scheme with community establishment, 22 plant’s competitiveness(C) and tress tolerance(S) were significant correlations with their relative importance values, which implied habitat filtration effect enables species clustered S strategy may have greater survival opportunities.Compared to C and S strategy, SR/CSR tended to sustain faster investment returns and involves return of a large proportion in propagules;To sum up, there are various economic tradeoffs among plants, but plants which have slow return strategy will get more opportunities to survive.