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控制植物群落聚集的规则，基于与优势和彩票竞争相关的功能特征，这些特征可以通过数据库LEDA获得。我们的目的是测试假设，物种组装是可预测的一般组成的功能基团，尽管它可能是不可预测的特定组成的物种。该项目由两部分组成。在第一部分中，我们的目的是从入侵物种和常驻物种的特征来解释物种进入稳定和演替植物群落，持续和灭绝。我们将在一项持续30年的草原长期管理试验（巴登-符腾堡州休耕试验）中分析序列效应。管理处理包括连续，每年覆盖两次，每年一次，每两年一次，每三年一次，每年燃烧一次，每两年一次，最后放牧或割草，这是实验开始前的原始土地利用类型。在第二部分，我们希望在时间序列分析的基础上，通过播种属于区域物种库而非本地群落物种库的具有某些功能性状组合的物种，来验证实验组装规则和序列效应。我们认为，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期留种的性状组合越相似，物种成功建立的概率越高。

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.