Agricultural acceleration of soil carbonate weathering.

Global Change Biology
John H KimRobert B Jackson

Abstract

Soil carbonates (i.e., soil inorganic carbon or SIC) represent more than a quarter of the terrestrial carbon pool and are often considered to be relatively stable, with fluxes significant only on geologic timescales. However, given the importance of climatic water balance on SIC accumulation, we tested the hypothesis that increased soil water storage and transport resulting from cultivation may enhance dissolution of SIC, altering their local stock at decadal timescales. We compared SIC storage to 7.3 m depth in eight sites, each having paired plots of native vegetation and rain-fed croplands, and half the sites having additional irrigated cropland plots. Rain-fed and irrigated croplands had 328 and 730 Mg C/ha less SIC storage, respectively, compared to their native vegetation (grassland or woodland) pairs, and irrigated croplands had 402 Mg C/ha less than their rain-fed pairs (p < .0001). SIC contents were negatively correlated with estimated groundwater recharge, suggesting that dissolution and leaching may be responsible for SIC losses observed. Under croplands, the remaining SIC had more modern radiocarbon and a δ13 C composition that was closer to crop inputs than under native vegetation, suggesting that cultivation has l...Continue Reading

References

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May 3, 2016·The Science of the Total Environment·Wenxu DongChunsheng Hu
Oct 19, 2016·Ecological Applications : a Publication of the Ecological Society of America·John H KimRobert B Jackson
Mar 27, 2018·Global Change Biology·Kazem ZamanianYakov Kuzyakov
Sep 15, 2018·Nature Communications·Mark G LawrenceJürgen Scheffran

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Citations

Dec 8, 2020·Global Change Biology·Sajjad RazaJianbin Zhou

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