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      Temperature sensitivity of soil carbon decomposition and feedbacks to climate change.

      Nature

      Temperature, analysis, Soil, metabolism, Plants, Greenhouse Effect, Carbon Dioxide, Carbon

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          Abstract

          Significantly more carbon is stored in the world's soils--including peatlands, wetlands and permafrost--than is present in the atmosphere. Disagreement exists, however, regarding the effects of climate change on global soil carbon stocks. If carbon stored belowground is transferred to the atmosphere by a warming-induced acceleration of its decomposition, a positive feedback to climate change would occur. Conversely, if increases of plant-derived carbon inputs to soils exceed increases in decomposition, the feedback would be negative. Despite much research, a consensus has not yet emerged on the temperature sensitivity of soil carbon decomposition. Unravelling the feedback effect is particularly difficult, because the diverse soil organic compounds exhibit a wide range of kinetic properties, which determine the intrinsic temperature sensitivity of their decomposition. Moreover, several environmental constraints obscure the intrinsic temperature sensitivity of substrate decomposition, causing lower observed 'apparent' temperature sensitivity, and these constraints may, themselves, be sensitive to climate.

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          Author and article information

          Journal
          16525463
          10.1038/nature04514

          Chemistry

          Temperature, analysis, Soil, metabolism, Plants, Greenhouse Effect, Carbon Dioxide, Carbon

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