Combinations of soil properties, carbon inputs and climate control the saturation deficit dynamics of stable soil carbon over 17-year fertilizaiton

文献类型： 外文期刊

第一作者： Di, Jiaying

作者： Di, Jiaying;Xu, Minggang;Zhang, Wenju;Wang, Boren;Di, Jiaying;Tong, Xiaogang;He, Xinhua;He, Xinhua;Gao, Hongjun;Liu, Hua

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2018 年 8 卷

页码：

收录情况： SCI

摘要： The soil organic carbon (SOC) saturation deficit (C-sd) of silt and clay fractions represents the potential for SOC sequestration in a stable form and can influence organic C stabilization efficiency. Little is known, however, about temporal changes of stable soil C-sd and how it is affected by soil properties, climate and C inputs. We investigated the temporal changes in the C-sd of fine fractions (< 53 mu m) and examined the factors controlling these changes at three dry-land sites with 17-year fertilizer management histories in China. The rates of change in the stable soil C-sd under manure treatments varied from -0.72 to -1.24% yr(-1) after 17 years of fertilization, indicating that stable C levels under manure treatments were significantly higher than those under other treatments. Stable soil C-sd was controlled by a combination of soil properties, temperature, and C inputs at all sites, and the higher variance of C-sd of fine fractions can be explained by the soil properties (up to 50%). Furthermore, the quantity of C inputs was the most influential variable for stable soil C-sd. These results revealed key controls on stable C sequestration potential and indicated the need to develop management strategies to promote stable C sequestration under long-term intensive fertilization.

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