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Long-term warming restructures Arctic tundra without changing net soil carbon storage

机译：长期变暖可在不改变土壤净碳储量的情况下重组北极苔原

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摘要

High latitudes contain nearly half of global soil carbon, prompting interest in understanding how the Arctic terrestrial carbon balance will respond to rising temperatures. Low temperatures suppress the activity of soil biota, retarding decomposition and nitrogen release, which limits plant and microbial growth. Warming initially accelerates decomposition, increasing nitrogen availability, productivity and woody-plant dominance. However, these responses may be transitory, because coupled abiotic-biotic feedback loops that alter soil-temperature dynamics and change the structure and activity of soil communities, can develop. Here we report the results of a two-decade summer warming experiment in an Alaskan tundra ecosystem. Warming increased plant biomass and woody dominance, indirectly increased winter soil temperature, homogenized the soil trophic structure across horizons and suppressed surface-soil-decomposer activity, but did not change total soil carbon or nitrogen stocks, thereby increasing net ecosystem carbon storage. Notably, the strongest effects were in the mineral horizon, where warming increased decomposer activity and carbon stock: a 'biotic awakening' at depth.
机译：高纬度包含全球土壤碳的近一半，这促使人们对了解北极陆地碳平衡将如何应对气温升高产生兴趣。低温抑制了土壤生物的活动，阻止了分解和氮的释放，从而限制了植物和微生物的生长。变暖最初会加速分解，增加氮的利用率，生产力和木本植物的优势。但是，这些反应可能是暂时的，因为可以形成耦合的非生物－生物反馈回路，从而改变土壤温度动态并改变土壤群落的结构和活性。在这里，我们报告了在阿拉斯加苔原生态系统中进行的为期两年的夏季变暖实验的结果。气候变暖增加了植物生物量和木质素优势，间接提高了冬季土壤温度，使各层土壤的营养结构均质化，抑制了土壤表层分解活动，但并未改变土壤总碳或氮储量，从而增加了生态系统净碳储量。值得注意的是，最强烈的影响是在矿物层，变暖增加了分解者的活动能力和碳储量：在深度上是“生物觉醒”。

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  • 来源
    《Nature》 |2013年第7451期|615-618|共4页
  • 作者

    Seeta A. Sistla; John C. Moore; Rodney T. Simpson; Laura Gough; Gaius R. Shaver; Joshua P. Schimel;

  • 作者单位

    Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, California 93108, USA;

    Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado80523, USA,Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, Colorado 80523, USA;

    Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado80523, USA;

    Department of Biology, University of Texas at Arlington,Arlington, Texas 76019, USA;

    The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA;

    Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, California 93108, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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