Research ArticleCLIMATE CHANGE

Climate legacies drive global soil carbon stocks in terrestrial ecosystems

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Science Advances  12 Apr 2017:
Vol. 3, no. 4, e1602008
DOI: 10.1126/sciadv.1602008


Climatic conditions shift gradually over millennia, altering the rates at which carbon (C) is fixed from the atmosphere and stored in the soil. However, legacy impacts of past climates on current soil C stocks are poorly understood. We used data from more than 5000 terrestrial sites from three global and regional data sets to identify the relative importance of current and past (Last Glacial Maximum and mid-Holocene) climatic conditions in regulating soil C stocks in natural and agricultural areas. Paleoclimate always explained a greater amount of the variance in soil C stocks than current climate at regional and global scales. Our results indicate that climatic legacies help determine global soil C stocks in terrestrial ecosystems where agriculture is highly dependent on current climatic conditions. Our findings emphasize the importance of considering how climate legacies influence soil C content, allowing us to improve quantitative predictions of global C stocks under different climatic scenarios.

  • Soil Carbon
  • Soil fertility
  • Climate Change
  • Last Glacial Maximum
  • Mid-Holocene
  • Croplands
  • Global scale

This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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