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Dynamic responses of terrestrial ecosystem carbon cycling to global climate change

机译:陆地生态系统碳循环对全球气候变化的动态响应

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摘要

Terrestrial ecosystems and the climate system are closely coupled, particularly by cycling of carbon between vegetation, soils and the atmosphere. It has been suggested that changes in climate and in atmospheric carbon dioxide concentrations have modified the carbon cycle so as to render terrestrial ecosystems as substantial carbon sinks; but direct evidence for this is very limited. Changes in ecosystem carbon stocks caused by shifts between stable climate states have been evaluated, but the dynamic responses of ecosystem carbon fluxes to transient climate changes are still poorly understood. Here we use a terrestrial biogeochemical model, forced by simulations of transient climate change with a general circulation model, to quantify the dynamic variations in ecosystem carbon fluxes induced by transient changes in atmospheric CO_2 and climate from 1861 to 2070. We predict that these changes increase global net ecosystem production significantly, but that this response will decline as the CO_2 fertilization effect becomes saturated and is diminished by changes in climatic factors. Thus terrestrial ecosystem carbon fluxes both respond to and strongly influence the atmospheric CO_2 increase and climate change.
机译:陆地生态系统和气候系统紧密相连,特别是通过植被,土壤和大气之间的碳循环。有人指出,气候和大气中二氧化碳浓度的变化改变了碳循环,使陆地生态系统成为大量的碳汇。但是对此的直接证据非常有限。已经评估了由稳定的气候状态之间的变化引起的生态系统碳储量的变化,但是对生态系统碳通量对瞬态气候变化的动态响应仍然知之甚少。在此,我们使用陆地生物地球化学模型,该模型是通过使用一般循环模型对瞬态气候变化进行模拟而得出的,用于量化1861年至2070年大气CO_2和气候的瞬态变化引起的生态系统碳通量的动态变化。我们预测这些变化会增加全球生态系统净生产量显着增加,但随着CO_2施肥效应达到饱和并因气候因素的变化而减弱,这种反应将减弱。因此,陆地生态系统的碳通量既响应并强烈影响了大气中CO_2的增加和气候变化。

著录项

  • 来源
    《Nature》 |1998年第6682期|p.249-252|共4页
  • 作者

    Mingkui Cao; F. Ian Woodward;

  • 作者单位
  • 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
  • 中图分类 自然科学总论;
  • 关键词

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