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Reconciling the temperature dependence of respiration across timescales and ecosystem types

机译：协调跨时间尺度和生态系统类型的呼吸温度依赖性

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摘要

Ecosystem respiration is the biotic conversion of organic carbon to carbon dioxide by all of the organisms in an ecosystem, including both consumers and primary producers. Respiration exhibits an exponential temperature dependence at the subcellular and individual levels~1, but at the ecosystem level respiration can be modified by many variables~(2-4) including community abundance and biomass~5, which vary substantially among ecosystems~6. Despite its importance for predicting the responses of the biosphere to climate change, it is as yet unknown whether the temperature dependence of ecosystem respiration varies systematically between aquatic and terrestrial environments. Here we use the largest database of respiratory measurements yet compiled to show that the sensitivity of ecosystem respiration to seasonal changes in temperature is remarkably similar for diverse environments encompassing lakes, rivers, estuaries, the open ocean and forested and non-forested terrestrial ecosystems, with an average activation energy similar to that of the respiratory complex~3 (approximately 0.65 electronvolts (eV)). By contrast, annual ecosystem respiration shows a substantially greater temperature dependence across aquatic (approximately 0.65 eV) versus terrestrial ecosystems (approximately 0.32 eV) that span broad geographic gradients in temperature. Using a model5 derived from metabolic theory~7, these findings can be reconciled by similarities in the biochemical kinetics of metabolism at the subcellular level, and fundamental differences in the importance of other variables besides temperature—such as primary productivity and allochthonous carbon inputs—on the structure of aquatic and terrestrial biota at the community level.
机译：生态系统呼吸是生态系统中所有生物（包括消费者和初级生产者）将有机碳生物转化为二氧化碳的过程。呼吸在亚细胞水平和个体水平〜1处表现出指数温度依赖性，但是在生态系统水平上，呼吸可以被许多变量〜（2-4）修改，包括群落丰度和生物量〜5，这些变量在生态系统〜6之间有很大差异。尽管它对于预测生物圈对气候变化的响应具有重要意义，但尚不清楚生态系统呼吸对温度的依赖性在水生和陆地环境之间是否会系统地变化。在这里，我们使用尚未编译的最大的呼吸测量数据库，显示出对于包括湖泊，河流，河口，开阔海洋以及森林和非森林陆地生态系统在内的多种环境，生态系统呼吸对温度的季节性变化的敏感性非常相似。平均活化能类似于呼吸复合物的平均活化能〜3（约0.65电子伏特（eV））。相比之下，年度生态系统呼吸显示跨水域（约0.65 eV）的温度依赖性比陆域生态系统（约0.32 eV）的温度依赖性要大得多，而陆地生态系统的呼吸作用跨越温度的广泛地理梯度。使用源自代谢理论〜7的模型5，这些发现可以通过亚细胞水平上代谢的生化动力学的相似性以及温度以外的其他变量（例如初级生产力和异源碳输入）的重要性的根本差异来加以协调。社区一级水生和陆生生物的结构。

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  • 来源
    《Nature》 |2012年第7408期|p.472-476|共5页
  • 作者

    Gabriel Yvon-Durocher; Jane M. Caffrey; Alessandro Cescatti; Matteo Dossena; Paul del Giorgio; Josep M. Gasol; Jose M. Montoya; Jukka Pumpanen; Peter A. Staehr; Mark Trimmer; Guy Woodward; Andrew P. Allen;

  • 作者单位

    School of Biological &Chemical Sciences, Queen Mary University of London, London E14NS, UK,Environmentand Sustainability Institute, University of Exeter, Penryn, Cornwall TR109EZ. UK;

    Center for Environmental Diagnostics and Bioremediation, University of West Florida, 11000 University Parkway, Pensacola, Florida 32514, USA;

    European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra 1-21027, Italy;

    School of Biological &Chemical Sciences, Queen Mary University of London, London E14NS, UK;

    Departement des sciences biologiques, Universite du Quebec a Montreal, Montreal, Province of Quebec, H2X 3X8, Canada;

    Institute of Marine Sciences (ICM-CSIC), Pg. Maritim de la Barceloneta, 37-49 E-08003 Barcelona, Spain;

    Institute of Marine Sciences (ICM-CSIC), Pg. Maritim de la Barceloneta, 37-49 E-08003 Barcelona, Spain;

    University of Helsinki Department of Forest Sciences, PO Box 27, FI-00014 University of Helsinki, Finland;

    Aarhus University, Institute of Bioscience, Frederiksborgvej 399, PO Box 358,4000 Roskilde, Denmark;

    School of Biological &Chemical Sciences, Queen Mary University of London, London E14NS, UK;

    School of Biological &Chemical Sciences, Queen Mary University of London, London E14NS, UK;

    Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109, Australia;

  • 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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