Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland
Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland
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北方泥炭地中维管植物物种对变暖和二氧化碳升高的反应
DOI：
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发表时间：
2020
影响因子：
6.7
通讯作者：
B. Palik
中科院分区：
文献类型：
--
作者：
M. McPartland;R. Montgomery;P. Hanson;J. Phillips;R. Kolka;B. Palik
泥炭地在植物生物量和土壤中储存了大量的陆地有机碳。变化环境下的云杉和泥炭地响应（Spruce）项目是一个变暖和二氧化碳（eCO2）升高的实验，旨在测试泥炭地生态系统的碳封存和储存能力如何应对气候变化。在这里，我们报告了发生在云杉的前五年维管植物群落的变化。在不同温度（+0、+2.25、+4.5、+6.75、+9°C）和不同CO2浓度（~400[环境]和900 ppm）的环境中，我们追踪了物种组成、多样性和地上净初级生产量（ANPP）。我们观察到地上维管植物生物量积累的增加，主要是由于灌木丰度的增加。总体物种多样性大幅下降，可能部分是由于灌木密度增加造成的遮阳。维管植物群落变化的主要驱动力是温度，CO2的影响最小。这些结果表明，ANPP总体上随着气候变暖而增加，但强调了直接（变暖）和间接（竞争）效应之间相互作用在决定北方泥炭地如何应对气候变化方面的重要性。
Peatlands store a significant amount of terrestrial organic carbon in plant biomass and soils. The Spruce and Peatland Responses Under Changing Environments (SPRUCE) project is a warming and elevated carbon dioxide (eCO2) experiment designed to test how the carbon sequestration and storage capacity of peatland ecosystems will respond to climate change. Here, we report changes in the vascular plant community that have occurred during the first five years of SPRUCE. We tracked species composition, diversity, and aboveground net primary production (ANPP) in chambers warmed at a wide range of temperatures (+0, +2.25, +4.5, +6.75, +9 °C), and two CO2 levels (~400 [ambient] and 900 parts per million). We observed an increase in aboveground vascular plant biomass accumulation, due primarily to an increase in shrub abundance. Overall species diversity decreased substantially, likely due in part to shading by increases in shrub density. The main driver of change in the vascular plant community was temperature, with minimal effects of CO2 evident. These results indicate an overall increase in ANPP with warming, but highlight the importance of interactions between direct (warming) and indirect (competition) effects in determining how boreal peatlands will respond to climate change.
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影响因子：
8.8
作者：
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通讯作者：
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影响因子：
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