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Drivers of decoupling in drylands

机译:旱地脱钩的驱动因素

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摘要

In all terrestrial ecosystems, the cycling of chemical elements is driven by both biotic and abiotic processes, but the ways in which these factors affect cycling vary for different elements. This is in part because carbon and nitrogen inputs to ecosystems are driven largely by biological processes such as photosynthesis and nitrogen fixation, whereas phosphorus inputs are driven mostly by weathering of rocks. The different driving processes can result in these cycles showing decoupled responses to environmental influences, as has been most convincingly demonstrated for long-term chronosequences (gradients of soils of different ages) in which the availability of phosphorus relative to nitrogen diminishes sharply over time. On page 672 of this issue, Delgado-Baquerizo et al.provide compelling evidence for a similar type of decoupled response to increasing aridity for dryland ecosystems worldwide.
机译:在所有陆地生态系统中,生物和非生物过程都驱动化学元素的循环,但是这些因素影响循环的方式因不同元素而异。部分原因是生态系统的碳和氮输入主要由光合作用和固氮等生物过程驱动,而磷的输入主要由岩石的风化驱动。不同的驱动过程可能导致这些循环显示出对环境影响的解耦响应,这已被最有说服力的长期序列(不同年龄土壤的梯度)证明,其中磷相对于氮的有效性随着时间而急剧减少。在本期杂志的第672页上,Delgado-Baquerizo等人提供了令人信服的证据,证明了全球干旱地区生态系统对干旱加剧的类似解耦反应。

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  • 来源
    《Nature》 |2013年第7473期|628-629|共2页
  • 作者

    DAVID A. WARDLE;

  • 作者单位

    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences,901 83 Umed, Sweden;

  • 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);
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  • 正文语种 eng
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