4.8 Article

The age distribution of global soil carbon inferred from radiocarbon measurements

期刊

NATURE GEOSCIENCE
卷 13, 期 8, 页码 555-+

出版社

NATURE PORTFOLIO
DOI: 10.1038/s41561-020-0596-z

关键词

-

资金

  1. European Research Council [695101]
  2. US DOE Office of Science Biological and Environmental Research RUBISCO Science Focus Area
  3. NASA Earth and Space Science Fellowship
  4. [DE-SC0014374]
  5. European Research Council (ERC) [695101] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

Soils contain more carbon than the atmosphere and vegetation combined. An increased flow of carbon from the atmosphere into soil pools could help mitigate anthropogenic emissions of carbon dioxide and climate change. Yet we do not know how quickly soils might respond because the age distribution of soil carbon is uncertain. Here we used 789 radiocarbon ( increment C-14) profiles, along with other geospatial information, to create globally gridded datasets of mineral soil increment C-14 and mean age. We found that soil depth is a primary driver of increment C-14, whereas climate (for example, mean annual temperature) is a major control on the spatial pattern of increment C-14 in surface soil. Integrated to a depth of 1 m, global soil carbon has a mean age of 4,830 +/- 1,730 yr, with older carbon in deeper layers and permafrost regions. In contrast, vertically resolved land models simulate increment C-14 values that imply younger carbon ages and a more rapid carbon turnover. Our data-derived estimates of older mean soil carbon age suggest that soils will accumulate less carbon than predicted by current Earth system models over the twenty-first century. Reconciling these models with the global distribution of soil radiocarbon will require a better representation of the mechanisms that control carbon persistence in soils. Soils may accumulate less carbon and with a slower turnover than Earth system models predict, according to analysis of the age distribution of global soil carbon, which finds that the mean age of soil carbon is older than that in simulated in models.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据