Root-Borne Microbial Necromass-An Overlooked Source of Grassland Soil Organic Carbon

文献类型： 外文期刊

第一作者： Zhang, Xinying

作者： Zhang, Xinying;Dai, Guohua;Zhai, Guoqing;Yi, Wenxing;Ma, Lixiao;Huang, Zhenying;Ye, Xuehua;Feng, Xiaojuan;Zhang, Xinying;Dai, Guohua;Zhai, Guoqing;Yi, Wenxing;Ma, Lixiao;Huang, Zhenying;Ye, Xuehua;Feng, Xiaojuan;Zhang, Xinying;Zhai, Guoqing;Yi, Wenxing;Ma, Lixiao;Huang, Zhenying;Feng, Xiaojuan;Zhang, Xinying;Ma, Wenhong;Wang, Yonghui;Zhang, Pujin

作者机构：

关键词： root; grassland; arbuscular mycorrhizal fungi; microbial necromass; soil organic carbon

期刊名称：GEOPHYSICAL RESEARCH LETTERS （ 影响因子：4.6； 五年影响因子：5.1 ）

ISSN： 0094-8276

年卷期： 2024 年 51 卷 22 期

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收录情况： SCI

摘要： Root-borne microbial necromass carbon (MNC) is an under-investigated contributor to soil organic carbon (SOC) in grasslands. Here we conduct a benchmark assessment of root-borne MNC based on amino sugars in the fresh roots of 27 dominant species and mixed roots (including dead ones) of mixed species in Inner Mongolian grasslands. We find that mixed roots contain 9.1-62.4 mg g-1 MNC, which may contribute similar to 10% of MNC in surface soils (0-10 cm) if all enters the soil without degradation. Root (and arbuscular mycorrhizal fungi; AMF) turnover rather than AMF biomass controls root-borne MNC accumulation. Based on a microcosm decomposition experiment of mixed roots in model soils under optimal conditions (similar to 22 degrees C; 60% of maximum water holding capacity), we further estimate that 43%-75% of root-borne MNC remains after 2-year decomposition, implying that root-borne MNC is relatively stable. Hence, root-borne MNC may be an overlooked potential source of soil MNC and SOC in grasslands.

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