Post-agricultural restoration of soil organic carbon pools across a climate gradient

文献类型： 外文期刊

第一作者： Wang, Yidong

作者： Wang, Yidong;Xue, Dongmei;Kuzyakov, Yakov;Wang, Zhong-Liang;Wang, Yidong;Xue, Dongmei;Wang, Zhong-Liang;Hu, Ning;Lou, Yilai;Zhang, Qingzhong;Zhang, Limin;Zhu, Ping;Gao, Hongjun;Zhang, Shuiqing;Zhang, Huimin;Li, Dongchu;Song, Zhaoliang;Kurganova, Irina;Kuzyakov, Yakov;Kuzyakov, Yakov

作者机构：

关键词： Natural vegetation restoration; Particulate organic matter; Physical and biochemical protection; Soil organic matter fractionation; Land use

期刊名称：CATENA （ 影响因子：5.198； 五年影响因子：5.594 ）

ISSN： 0341-8162

年卷期： 2021 年 200 卷

页码：

收录情况： SCI

摘要： Post-agricultural natural restoration is a worldwide strategy for eco-environmental sustainability. However, it is unclear how it affects soil organic carbon (SOC) pools and composition among soil types across climate gradient. Here, we investigated 23-year post-agricultural restorations of SOC in three soils: Luvic Phaeozem, Calcaric Cambisol and Ferralic Cambisol typical for mid-temperate, warm-temperate and subtropical zones, respectively. Six SOC fractions with different protection mechanisms (non-protected, physically, chemically, biochemically, physico-chemically and physico-biochemically) were separated. Compared with pre-restoration in 1990, post-agricultural restoration rebuilt SOC similarly (+68-+91%) among the three soils despite of different SOC background. Compared with continuous cultivation, post-agricultural restoration increased total SOC pools in all the three soils (+33-+60%) mainly because of the increments of non-protected pool (coarse particulate organic C, cPOC). However, the pure physically, chemically, and biochemically protected SOC fractions were less sensitive to post-agricultural restoration. The physico-biochemically protected SOC was hampered by restoration in the two temperate soils but remained stable in the subtropical soil, suggesting a divergent self-restoring trend. Positive correlations of the total SOC and most fractions with wetness (precipitation/temperature ratio) demonstrated the climate dependency of SOC. In conclusion, post-agricultural natural restoration builds up SOC pool mainly due to the cPOC increment and shifts SOC composition towards more easily available C in three soils across the climatic gradient.

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