Analysis of root traits to test for environmental filtering and niche complementarity in grassland communities

分析根性状以测试草原群落的环境过滤和生态位互补性

• 批准号: 61580740
• 负责人: Professor Dr. Helge Bruelheide
• 金额: --
• 依托单位: Institut für Biologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/61580740?language=en
• 关键词: Analysis; root; traits; test; environmental

While the preceding project BE RICH predicted species performance in a recipient community from the whole regional species pool based on aboveground traits, BE LOW will change the perspective and take on the newcomers' perspective, aiming at predicting in which local neighbourhood a newcomer might perform best. We will have a particular emphasis on traits with a functional link to belowground processes, and thus analyse root traits and exudates, including a broad spectrum of low molecular organic compounds exudated by plants. We will test the hypotheses that (H1) survival and performance can be predicted from the statistical probability of co-occurrence of a species in a specific local neighbourhood, (H2) community-weighted mean traits and functional diversity is related to land use intensity, (H3) the leaf economics spectrum is related to the root economics spectrum. In addition, we will test that (H4) in a specific environmental setting there is a defined degree of trait similarity to the resident neighbourhood community at which performance is maximized, caused by a balance of environmental filtering versus competition by limiting similarity. Furthermore, we hypothesize that (H5) root trait values and root exudation patterns are adjusted to the local neighbourhood and to land use, (H6) certain root trait values and exudates result in a change in soil conditions with time and (H7) that root exudate composition is plant species-specific, and in particular grass species differ from herb species. We plan to use ten species each of mycorrhizal and non-mycorrhizal species as well as ten species each of grass and herb species, in total 20 species, studied both in the field and in the greenhouse. For ten of them we will analyse root exudates. The project will consist of four work packages, which will comprise raising plants and analysis of the local neighbourhood (WP1), planting phytometers of the 20 species into a selection of 54 grassland plots (3 exploratories, 3 land use types, 6 replicates), monitoring their growth and assessing their anatomical, morphological and chemical root traits at the final harvest and using these data to predict assembly rules (WP2), conducting glasshouse experiments in pots for root trait analysis (WP3), and analyzing exudates and roots for mass spectrometry-based non-targeted metabolite analysis (WP4).In summary, we bring together functional biodiversity research, community ecology and functional root research to fill an important gap between above- and belowground processes.

虽然之前的项目BE RICH根据地上特征从整个区域物种库预测了受体社区的物种表现，但BE LOW将改变视角，并采取新来者的视角，旨在预测新来者可能在哪个地方社区表现最好。我们将特别强调与地下过程有功能联系的性状，从而分析根的性状和分泌物，包括植物分泌的低分子有机化合物的广谱。我们将测试的假设，（H1）生存和性能可以预测的统计概率，在一个特定的当地社区的物种共存，（H2）社区加权平均性状和功能多样性与土地利用强度，（H3）叶经济谱相关的根经济谱。此外，我们将测试（H4）在一个特定的环境设置中，有一个确定的程度的性状相似性的居民邻里社区，在性能最大化，由环境过滤与竞争的平衡所造成的限制相似性。此外，我们假设（H5）根性状值和根分泌物的模式进行调整，以当地的邻里和土地利用，（H6）某些根性状值和分泌物的结果在土壤条件随时间的变化和（H7），根分泌物的组成是植物物种特异性的，特别是草种不同的草本植物。我们计划使用10种菌根和非菌根物种以及10种草和草本物种，总共20种，在田间和温室中进行研究。我们将分析其中的10种植物的根系分泌物。该项目将包括四个工作包，其中包括种植植物和分析当地社区（WP 1），在54块草地中种植20个物种的植物计（3个勘探站，3种土地利用类型，6个重复），监测其生长并评估其解剖结构，最终收获时的形态和化学根性状，并使用这些数据来预测组装规则（WP 2），在盆中进行温室实验以进行根性状分析（WP 3），以及分析渗出物和根系，用于基于质谱的非靶向代谢物分析（WP 4）。总之，我们将功能性生物多样性研究、群落生态学和功能性根系研究结合在一起，填补了地上和地下过程之间的重要空白。