Functional Trait Changes, Productivity Shifts and Vegetation Stability in Mountain Grasslands during a Short-Term Warming.
Functional Trait Changes, Productivity Shifts and Vegetation Stability in Mountain Grasslands during a Short-Term Warming.
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DOI：
10.1371/journal.pone.0141899
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Sebastià MT
中科院分区：
文献类型：
--
作者：
Debouk H;de Bello F;Sebastià MT
植物功能性状是植被对全球变暖等环境变化响应的基础，并进而影响生态系统过程。虽然大多数现有的研究只集中在变暖对物种多样性和生产力的影响，我们进一步调查（i）如何在温带草原群落植物功能性状的结构响应实验变暖，以及（ii）物种和功能多样性是否有助于更大的稳定性草原，在植被组成和生产力方面。从东比利牛斯山脉的温带亚高山草原（高地）中提取完整的植被特尔韦斯，并移植到加泰罗尼亚西部（低地）的莱利达的温暖大陆性实验场地。模拟变暖对植物生产和多样性，功能性状结构和植被组成的稳定性的影响进行了评估。我们观察到，在短期变暖的生物量增加，减少物种和功能多样性。草地群落的功能结构发生了显著的变化，在功能多样性和社区加权平均数（CWM）的几个特征。在低地，具有较高比叶面积、开花早、直立生长习性和根茎策略的收购性和快速生长的物种成为优势。生产力显着正相关的物种，并在较低程度上，功能多样性，但生产力和稳定性变暖后更依赖于性状组成（CWM）比多样性。暖前有较多捕食性物种的特尔韦斯，暖后其组成变化较小。结果表明，短期升温会导致快速生长的物种对保守物种的占有优势，从而降低物种丰富度;与多样性效应相比，短期升温下草地群落功能性状结构对群落生产力和稳定性的影响更大。总之，短期气候变暖可以极大地改变植被功能结构及其与生产力的关系。
Plant functional traits underlie vegetation responses to environmental changes such as global warming, and consequently influence ecosystem processes. While most of the existing studies focus on the effect of warming only on species diversity and productivity, we further investigated (i) how the structure of community plant functional traits in temperate grasslands respond to experimental warming, and (ii) whether species and functional diversity contribute to a greater stability of grasslands, in terms of vegetation composition and productivity. Intact vegetation turves were extracted from temperate subalpine grassland (highland) in the Eastern Pyrenees and transplanted into a warm continental, experimental site in Lleida, in Western Catalonia (lowland). The impacts of simulated warming on plant production and diversity, functional trait structure, and vegetation compositional stability were assessed. We observed an increase in biomass and a reduction in species and functional diversity under short-term warming. The functional structure of the grassland communities changed significantly, in terms of functional diversity and community-weighted means (CWM) for several traits. Acquisitive and fast-growing species with higher SLA, early flowering, erect growth habit, and rhizomatous strategy became dominant in the lowland. Productivity was significantly positively related to species, and to a lower extent, functional diversity, but productivity and stability after warming were more dependent on trait composition (CWM) than on diversity. The turves with more acquisitive species before warming changed less in composition after warming. Results suggest that (i) the short-term warming can lead to the dominance of acquisitive fast growing species over conservative species, thus reducing species richness, and (ii) the functional traits structure in grassland communities had a greater influence on the productivity and stability of the community under short-term warming, compared to diversity effects. In summary, short-term climate warming can greatly alter vegetation functional structure and its relation to productivity.