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摘要：在植物群落生态学领域，物种共存，特别是亲缘关系相近物种的共存，一直难以有合理的解释。这主要是由于近缘物种之间高度的生态位重叠以及高强度的竞争关系。在群落生态学中，为了描述物种间的生态学差异，植物功能性状以及植物系统发育信息的使用非常广泛。然而，是植物功能性状还是系统发育信息，更大程度上决定了植物对环境变化因素的响应仍不明确。我们进行了一个温室实验研究上述问题。 试验选取 11 个来自青藏高原高寒草甸的植物物种， 并实施土壤灭菌、加氮、增温，以及他们之间的交互处理。我们假设，近缘物种对于环境变化会产生更相似的响应。实验发现，近缘物种对不同处理的响应具有显著的差异，该结果不支持我们的理论假设。从所有的物种来看，物种间对土壤灭菌处理的响应的相似性，与系统发育距离有一定的相关性，但这种相似性与其原有的功能性状相似性具有更紧密的相关性。这也许意着植物功能性状对土壤反馈有区别的响应，促进了近缘物种的共存。38009
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毕业论文关键词：群落生态学；系统发育；植物功能性状；物种共存Distinct responses of functional traits to soil feedback facilitatecoexistence of closely related speciesAbstract： It is a long-standing controversy about the coexistence of closely related plant species. It’ssupposed that species which have similar functional traits and occupy similar niches will lead tocompetition exclusion. To describe the ecological differences between species, plant functional traits andphylogenetic information are broadly used. However, it’s still not clear which characters are relativelyimportant in determining the responses of plant to altered environments. We conducted a greenhouseexperiment to detect the responses of 11 alpine plant species to soil microbe, nitrogen addition andwarming. We hypothesized that closely related species will have similar responses to environmental factorsindependently of functional traits. Inconsistent with this hypothesis, we found that the biomass of closelyrelated species significantly differ under different treatments. Across all the species, the dissimilarity ofplant biomass responses to soil microbe was phylogenetically conserved, but was more significantlycorrelated with the dissimilarity in functional traits. These results suggested that dissimilarity of responsesin functional traits may be critical for the closely related species to occupy different niches and coexist innatural community.
Key words: community assembly；phylogeny；plant functional traits；species coexistence
Contents
摘要1
关键词1
Abstract1
Key words1
Introduction2
1 Material and methods2
1.1 Species and study site2
1.2 Methods 3
1.2.1 Greenhouse experiment3
1.2.2 Phylogeny3
1.2.3 Statistical analyses4
2 Results4
2.1 Responses of plant functional trait4
2.2 Responses of plant functional trait in functional groups6
2.3 Relative importance of functional trait and phylogeny7
3 Discussions 9
3.1 Responses of plant functional trait9
3.2 Responses of functional trait in functional groups9
3.3 Relative importance of functional trait and phylogeny9
4 Conclusions 9
Acknowledgments10
References10
Species coexistence, especially coexistence between closely related species is along-standing controversy in community ecology, because the related species have high nicheoverlap and intense competition between them [1-3]. As the simplest measure of biopersity,species richness cannot account for the differences or similarities of species’ ecologicalcharacters [4]. As for this, there have been two main advances in past decades. The first is atrait-based approach, which uses functional traits based on a single or a multivariate trait toquantify species persity. The second approach requires phylogeny to analyze thephylogenetic affinity, because the dissimilarity in genotypes also as ecological function iscorrelated with evolutionary pergence times [5].It’s is still not clear which aspect of functional traits or phylogenetic matters more on thecoexistence of closely related species. If ecological differences are correlated withevolutionary pergence, the more phylogenetic pergent species are present, the more likelythey have different functional traits and occupy different niches [6].