Time course of plant diversity effects on productivity, stability and assembly of communities and relation to plant-plant and plant-fungal leaf pathogen interactions

先前的工作证明了多样性对植物群落生产力、稳定性和聚集的影响。然而，基本的机制仍然是未知的。因此，我们解决这样的机制的基础上，由耶拿实验提供的植物性能数据的长时间序列，新的实验操作和地上植物-植物和植物-病原体相互作用的补充数据。在工作包1中，我们将测试在主实验和显性实验中互补性是否随着时间的推移而增加。此外，我们将比较群落动态没有和入侵（新的裂区在主要实验），以测试群落稳定性是如何与植物物种丰度的波动。在新的基于性状的实验中，我们将测试是否故意大的性状差异最大化互补性。在工作包2中，我们将推导并比较新温室实验和主实验及显性实验中植物成对相互作用系数的矩阵。我们将使用这些相互作用矩阵的Lotka-Volterra方法来预测混合物中的多样性效应。在工作包3中，我们将使用入侵处理来测试入侵下的群落组装是否会导致所有群落的多样性和生产力的收敛，但最初不同群落的物种组成不同。总之，我们的子项目将进一步了解多样性对植物群落生产力，稳定性和组装的影响机制。

Previous work demonstrated diversity effects on plant community productivity, stability and assembly. However, underlying mechanisms are still largely unknown. Therefore, we address such mechanisms based on the long time series of plant performance data provided by the Jena Experiment, on new experimental manipulations and on complementary data about aboveground plant–plant and plant– pathogen interactions. In work package 1, we will test whether complementarity increases over time in the main and dominance experiments. Furthermore, we will compare community dynamics without and with invasion (new split-plots in main experiment) to test how community stability is related to fluctuations in plant species abundances. In the new trait-based experiment we will test whether deliberately large trait differences maximize complementarity. In work package 2, we will derive and compare matrices of pair-wise plant interaction coefficients from the new glasshouse experiment and the main and dominance experiments. We will use these interaction matrices in Lotka-Volterra approaches to predict diversity effects in mixtures. In work package 3, we will use the invasion treatment to test whether community assembly under invasion leads to convergence of diversity and productivity of all communities, but different species composition of initially different communities. In conclusion, our subproject will further the understanding of mechanisms underlying diversity effects on productivity, stability and assembly of plant communities.