文献类型： 外文期刊
作者： Zhang, Xinying 1 ; Dai, Guohua 1 ; Zhai, Guoqing 1 ; Yi, Wenxing 1 ; Ma, Lixiao 1 ; Huang, Zhenying 1 ; Ye, Xuehua 1 ; Ma, Wenhong 5 ; Wang, Yonghui 5 ; Zhang, Pujin 6 ; Feng, Xiaojuan 1 ;
作者机构： 1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.China Natl Bot Garden, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
4.Fujian Normal Univ, Sch Geog Sci, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou, Peoples R China
5.Inner Mongolia Univ, Sch Ecol & Environm, Hohhot, Peoples R China
6.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot, Peoples R China
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
页码：
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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