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Testing the effects of productivity, grazing and drought on grassland plant diversity

测试生产力、放牧和干旱对草原植物多样性的影响

基本信息

批准号：
RGPIN-2017-04984
负责人：
Fraser, Lauchlan
金额：
$ 2.91万
依托单位：
Thompson Rivers University
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688076
关键词：
Testing effects productivity grazing drought

项目摘要

The long-term goal of my research is to understand what controls plant diversity in grasslands and how plant diversity affects grassland ecosystem function. Considering the importance of grasslands worldwide and the stressors that affect grasslands, such as climate change, over-grazing and habitat loss, it is critical to provide information for optimal land management. The short-term goals that I propose within my Discovery Grant application are designed to determine the effects of productivity, grazing and drought on temperate grassland biodiversity and plant trait-ecosystem function relationships. A new dimension to my research will be to embed local research objectives within two international research networks, HerbDivNet and DroughtNet. I will manipulate productivity, grazing and drought on grassland ecosystems, and tease apart fine-scale and landscape patterns in herbaceous plant diversity to: (1) test how productivity affects alpha and beta diversity of grassland communities; (2) determine whether grassland type influences the relationship between plant biomass and herbaceous species richness with and without grazing; and (3) test the effects of reducing water availability through rainout shelters on temperate grassland plant communities and ecosystem-level processes.

我研究的长期目标是了解是什么控制了草原植物多样性，以及植物多样性如何影响草原生态系统功能。考虑到全球草原的重要性以及影响草原的压力因素，如气候变化、过度放牧和栖息地丧失，为优化土地管理提供信息至关重要。我在“发现基金”申请中提出的短期目标是确定生产力、放牧和干旱对温带草原生物多样性和植物性状-生态系统功能关系的影响。我的研究的一个新维度将是把当地的研究目标嵌入两个国际研究网络，HerbDivNet和DroughtNet。本文将利用生产力、放牧和干旱对草地生态系统的影响，梳理草本植物多样性的精细尺度和景观格局，以期：(1)检验生产力对草地群落α和β多样性的影响；(2)确定有无放牧条件下草地类型对植物生物量和草本物种丰富度的影响关系；(3)通过遮雨棚降低水分有效性对温带草原植物群落和生态系统水平过程的影响。