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Inter- and intraspecific variability in the responses of grassland plants to winter climate change

草原植物对冬季气候变化响应的种间和种内变异

基本信息

批准号：
206445233
负责人：
Professor Dr. Jürgen Kreyling
金额：
--
依托单位：
Arbeitsgruppe Experimentelle Pflanzenökologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/206445233?language=en
关键词：
Inter intraspecific variability responses grassland

项目摘要

Climate warming is expected to shorten the duration of winter. However, in temperate grasslands, increased temperature variability and changes to cold acclimation cues could challenge plants by exposing them to frost at times when they are not fully cold acclimated. In particular, basal meristems of grasses at the soil surface are vulnerable to air temperature extremes if there is reduced snow cover, and the latter is predicted for temperate regions with climate warming. When challenged by climate extremes, genetic variation within populations or dispersal from other populations enables species to persist at a specific location. High inter-specific variation in frost tolerance can alter species composition if dispersal of frost tolerant ecotypes is limited. Therefore, the future composition of temperate grasslands will depend on the balance between inter- versus intraspecific variation in frost tolerance in an altered climate, yet very little data are available on this topic. Here, we propose to compare inter- versus intraspecific variation in the responses of grassland plants to winter climate change. Specifically, we will examine (1) plant responses to variation in the frequency and intensity of soil freeze thaw cycles, (2) cold acclimation responses to warmer winters of shorter duration, and (3) deacclimation and frost vulnerability in response to mid-winter thaw events, in controlled- environment chamber experiments. We will focus on inter-specific variation within German grassland species as compared to ecotypic variation within a single species on a continental scale.

气候变暖预计将缩短冬季的持续时间。然而，在温带草原，增加的温度变化和变化的冷驯化线索可能会挑战植物暴露于霜冻的时候，他们没有完全冷驯化。特别是，基层分生组织的草在土壤表面容易受到空气温度的极端，如果有减少积雪，后者是预测气候变暖的温带地区。当受到极端气候的挑战时，种群内的遗传变异或来自其他种群的扩散使物种能够在特定地点持续存在。高种间差异的耐霜冻性可以改变物种组成，如果耐霜冻生态型的传播是有限的。因此，未来的温带草原的组成将取决于之间的平衡与种内变化的抗冻性在改变气候，但很少有数据可在这个问题上。在这里，我们建议比较间与种内变化的草原植物对冬季气候变化的反应。具体而言，我们将研究（1）植物对土壤冻融循环频率和强度变化的反应，（2）对持续时间较短的暖冬的冷驯化反应，以及（3）在受控环境室实验中对仲冬解冻事件的去驯化和霜冻脆弱性。我们将集中在德国草原物种内的种间变异相比，在一个单一的物种在大陆规模的生态变化。