Microbial nutrient limitations limit carbon sequestration but promote nitrogen and phosphorus cycling: A case study in an agroecosystem with long-term straw return

被引:15
|
作者
Li, Shuailin [1 ,2 ]
Cui, Yongxing [3 ]
Xia, Zhuqing [1 ]
Zhang, Xinhui [1 ]
Zhou, Changrui [4 ]
An, Siyu [1 ]
Zhu, Mengmeng [1 ]
Gao, Yun [1 ]
Yu, Wantai [1 ,2 ]
Ma, Qiang [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
[2] Key Lab Terr Ecosyst Carbon Neutral, Shenyang, Liaoning, Peoples R China
[3] Peking Univ, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
[4] East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China
基金
中国国家自然科学基金;
关键词
Agricultural ecosystems; C sequestration ef ficiency; Crop growth; Ecoenzymatic stoichiometry; Microbial metabolism; USE EFFICIENCY; ECOENZYMATIC STOICHIOMETRY; ECOLOGICAL STOICHIOMETRY; EXTRACTION METHOD; ORGANIC NITROGEN; SOIL CARBON; MICROORGANISMS; MINERALIZATION; RHIZOSPHERE; COMPETITION;
D O I
10.1016/j.scitotenv.2023.161865
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Soil fertility can be increased by returning crop residues to fields due to the cooperative regulation of microbial metab-olism of carbon (C) and nutrients. However, the dose-effect of straw on the soil C and nutrient retention and its under-lying coupled microbial metabolic processes of C and nutrients remain poorly understood. Here, we conducted a comprehensive study on soil nutrients and stoichiometry, crop nutrient uptake and production, microbial metabolic characteristics and functional attributes using a long-term straw input field experiment. We estimated the microbial metabolic limitations and efficiency of C and nitrogen (N) use (CUE and NUE) via an enzyme-based vector-TER model, biogeochemical-equilibrium model and mass balance equation, respectively. In addition, the absolute abun-dances of 20 functional genes involved in the N-and P-cycles were quantified by quantitative PCR-based chip technol-ogy. As expected, straw input significantly increased C and N stocks, C: nutrients, crop nutrient uptake and growth. However, the C sequestration efficiency decreased by approximately 6.1 %, and the N2O emission rate increased by 0.5-1.0 times with the increase in straw input rate. Interestingly, the microbial metabolism was more limited by P when straw input was <8 t ha-1 but was reversed when straw input was 12 t ha-1. The enhanced nutrient limitation reduced both the CUE and the NUE of microbes and then upregulated genes associated with the hydrolysis of C, the mineralization of N and P, and denitrification, which consequently influenced C and N losses as well as crop growth. This study highlights that soil C and nutrient cycling are strongly regulated by microbial metabolic limitation,
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页数:10
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