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Enhanced unprotected organic carbon in macroaggregates facilitates soil organic carbon accumulation following grazing removal in Tibetan alpine meadows

文献类型： 外文期刊

作者： Liu, Xiang 1 ; Ma, Zhiwen 2 ; Qin, Wenping 1 ; Li, Xiaoyan 1 ; Shi, Hongxiao 4 ; Hasi, Bagen 5 ; Li, Honglin 1 ; An, Zhifang 1 ; Tian, Lihui 1 ;

作者机构： 1.Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Peoples R China

2.Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Changchun 130024, Peoples R China

3.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China

4.Qinghai Prov Grassland Stn, Xining 810008, Peoples R China

5.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China

关键词： Particulate organic carbon; Mineral-associated organic carbon; Soil aggregate; Carbon storage; Alpine grassland; Soil fractionation

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Background and aimsGrazing removal is a globally implemented strategy for rehabilitating degraded grasslands. However, its effect on soil organic carbon (SOC) fractions remains inadequately understood.MethodsHerein, the SOC pool was divided into coarse particulate OC (cPOC), free fine POC (fPOC), intra-microaggregate fine POC (iPOC), and mineral-associated OC (MAOC) by a physical fractionation scheme to quantify the changes in SOC after 4 and 12 years of grazing removal in Tibetan alpine meadows.ResultsThe results demonstrated that OC associated with macroaggregates (MA) was more sensitive to grazing removal than that within microaggregates (MI). Grazing removal enhanced the contents of fPOC-MA (27-42%) and MAOC-MA (154-172%), driving the accumulation of OC within MA. The content of unprotected OC (cPOC and fPOC) in bulk soil significantly increased by 77-92% following grazing removal, primarily attributed to the accrual of unprotected OC within MA. While grazing removal promoted the accumulation of protected OC (iPOC and MAOC) within MA, it simultaneously reduced the content of protected OC within both MI and silt and clay particles. Consequently, the content of protected OC in bulk soil showed minimal variation after grazing removal. Partial least squares path modeling further revealed that unprotected OC in bulk soil was jointly influenced by plant biomass and microbial necromass C (MNC), whereas protected OC was mainly governed by MNC.ConclusionsWe concluded that the accumulation of unprotected OC in MA and the reallocation of protected OC in soil matrix were crucial to SOC dynamics during grazing removal in Tibetan alpine meadows.

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