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Climate Warming Decreases Plant Diversity but Increases Community Biomass in High-Altitude Grasslands
Rangeland Ecology & Management ( IF 2.3 ) Pub Date : 2021-01-07 , DOI: 10.1016/j.rama.2020.11.008
Kesang Wangchuk , Andras Darabant , Harilal Nirola , Jigme Wangdi , Georg Gratzer

The rugged Himalayan landscape results in large variations in site conditions that regulate plant response to warming. There is lack of deeper understanding on plant response to warming under differing site characteristics in the mountainous terrain. A 2-yr experiment was conducted in the high mountains of Bhutan. The objective was to investigate the effects of short-term artificial warming on high-altitude grassland vegetation at north- and south-facing sites. An artificially warmed environment was simulated using open-top chambers (OTCs) that were compared with control chambers experiencing ambient conditions. Variables measured were species diversity, species richness, proportions of plant functional groups, forage dry matter, and forage quality. Generally at the north-facing site, OTC treatment showed a lower species diversity (OTC treatment H' ≈2.35; Control treatment H' ≈2.75), species richness (OTC treatment MI 1.38; Control treatment MI 1.45), sedge abundance (OTC treatment sedge cover 14.5%; Control treatment sedge cover 25%), and crude protein content (OTC treatment CP 6.60%; Control treatment CP 7.70%). On both sites, OTC treatment had a higher grass abundance (OTC treatment grass cover 24.0%; Control treatment grass cover ≈17.0%) and higher dry matter content (OTC treatment DM ≈1.70 t ha−1; Control treatment DM ≈1.50 t ha−1). The study suggests that climate warming triggers shifts in vegetation characteristics of high-altitude grasslands in the rugged mountainous terrain, but the magnitude of shift varies according to site characteristics. Under warming, the north-facing site could experience greater vegetation change, characterized by reduced species diversity, species richness, proportion of sedge, and crude protein content.



中文翻译:

气候变暖减少了植物多样性,但增加了高海拔草原的群落生物量

崎Him的喜马拉雅山地景观导致场地条件发生很大变化,从而调节了植物对变暖的反应。在山区地形不同的地点特征下,人们对植物对变暖的反应缺乏更深入的了解。在不丹的高山上进行了为期2年的实验。目的是研究短期人工增温对朝北和朝南地点高海拔草地植被的影响。使用开放式腔室(OTC)模拟了人工加热的环境,将其与经历环境条件的控制腔室进行了比较。测得的变量是物种多样性,物种丰富度,植物功能组的比例,草料干物质和草料质量。通常在朝北的地点, 1.38; 控制治疗MI 1.45),莎草丰度(OTC治疗莎草盖 14.5%;对照处理莎草盖 25%),和粗蛋白含量(OTC治疗CP 6.60%;对照处理CP 7.70%)。在这两个站点上,OTC处理的草丰度较高(OTC处理的草覆盖度约为24.0%;对照处理的草覆盖度约为17.0%),干物质含量较高(OTC处理的DM≈1.70t ha -1;对照处理的DM≈1.50t ha -1)。该研究表明,气候变暖触发了崎mountain山区中高海拔草原植被特征的变化,但变化的幅度因地点特征而异。在变暖的情况下,朝北的地点可能经历更大的植被变化,其特征是物种多样性,物种丰富度,莎草比例和粗蛋白含量降低。

更新日期:2021-01-07
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