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Long-term green manuring increases soil carbon sequestration via decreasing qCO2 caused by lower microbial phosphorus limitation in a dry land field

文献类型： 外文期刊

作者： Ma, Zhengbo 1 ; Liang, Ting 1 ; Fu, Haoran 2 ; Ma, Qingxu 2 ; Chang, Danna 1 ; Zhang, Jiudong 3 ; Che, Zongxian 3 ; Zhou, Guopeng 4 ; Cao, Weidong 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

2.Zhejiang Univ, Coll Environm & Resource Sci, Zhejiang Prov Key Lab Agr Resources & Environm, Hangzhou 310058, Peoples R China

3.Gansu Acad Agr Sci, Inst Soil & Fertilizer & Water Saving Agr, Lanzhou 730070, Peoples R China

4.Anhui Agr Univ, Coll Resources & Environm, Anhui Prov Engn & Technol Res Ctr Intelligent Manu, Hefei 230036, Peoples R China

关键词： Microbial carbon use efficiency; Fertilization management; Ecoenzymatic stoichiometry; Soil respiration; Microbial nutrient limitation

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.0； 五年影响因子：6.4 ）

ISSN： 0167-8809

年卷期： 2024 年 374 卷

页码：

收录情况： SCI

摘要： Organic fertilization in agroecosystems is an efficient fertilization management for sequestering carbon (C). Microbial metabolism affects C sequestration by influencing the rate of soil C mineralization, however, the responses of microbial metabolism limitation and soil respiration to different organic fertilizations remain unclear. Here, an experiment started from 1988 in a dry land of Northwest China was used to explore the mechanisms of C sequestration under five typical fertilization managements, namely no fertilization (CK), mineral nitrogen fertilizer (NF), wheat straw (WS), cattle manure (CM), and green manure (GM). The results indicated that the WS, CM, and GM treatments increased C sequestration rates by 28.3 %, 119.4 %, and 72.1 % in the 0-60 cm layer, compared with NF, whereas C sequestration efficiency was the greatest in the GM treatment. In addition, organic fertilization treatments increased the contents of soil nutrients across all the soil layers to varying degrees, and the activities of C, nitrogen (N), and phosphorus (P) -related enzyme in 0-60 cm soil layer also increased by 219.1 similar to 236.9 %, 236.7 similar to 774.5 %, and 2.5 similar to 36.5 % compared with NF. Enzymatic stoichiometry indicated that the soil microbial metabolism across all soil layer was mainly limited by P. Organic fertilization alleviated the microbial P limitation and decreased the microbial metabolic quotient (qCO(2)) in 0-20 cm soil layer. And GM treatment showed the lowest P limitation and qCO(2) in all soil layers. The partial least square path model demonstrated that microbial P limitation was the main driver affecting qCO(2). Alleviating the microbial P limitation decreased unnecessary C loss during microbial catabolism, converting more C to MBC, thereby increasing CUE and lowering qCO(2). In summary, green manuring is the most efficient practice to benefit C sequestration across all fertilization managements in this study.

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