Analysis and experimental validation of assembly rules of local plant communities basing on a competition-lottery model and using a functional trait approach (EuroDIVERSITY 040)

该项目的主要目标是了解的规则，管理大会的植物群落，基于功能性状相关的优势和彩票竞争，可通过数据库LEDA。我们的目标是测试的假设，即物种组装是可预测的功能基团的一般组成，虽然它可能是不可预测的，在物种的具体组成。该项目包括两个部分。在第一部分中，我们的目的是解释物种进入，持久性和灭绝的稳定和演替植物群落的入侵物种和居民社区的特点。我们将分析序列的影响，在草原上运行现在30年的长期管理实验（休耕实验巴登-符腾堡）。管理措施包括演替，每年覆盖2次、1次、2次、3次，每年焚烧1次、2次，最后放牧或割草，这些都是试验前的原始土地利用类型。在第二部分中，我们要验证实验组装规则和序列效应的时间序列分析的基础上，播种的物种与某些功能性状组合属于区域物种库，但不属于当地社区物种库。我们假设，在不同管理处理的植物群落中，引入物种的功能性状组合与干扰阶段的留居物种的性状组合越相似，物种成功建立的概率就越高。

The main goal of this project is to understand the rules that govern the assembly of plant communities, based on functional traits related to dominance and lottery competition which are available via the database LEDA. We aim to test the hypothesis that species assembly is predictable in the general composition of functional groups, although it might be unpredictable in the specific composition in species. The project consists of two parts. In the first part, we aim to explain the entry of species into, persistence in and extinction from both stable and successional plant communities in terms of the traits of the invading species and of the resident community. We will analyse sequence effects in a long-term management experiment in grasslands running now 30 years (fallow experiments Baden-Wuerttemberg). Management treat - ments include succession, mulching twice per year, once per year, every second year and every third year, burning once per year and every second year and finally grazing or mowing which were the original land use types before the set-up of the experiment. In the second part, we want to validate experimentally assembly rules and sequence effects based on the analysis of the time-series by sowing species with certain functional trait combinations belonging to the regional species pool but not to the local community species pool. We suppose that in the plant communities of the different management treatments the probability of successful establishment of a species is the higher the more the functional trait combination of the introduced species resembles the trait combinations of the resident species of the disturbance stage.