Nutrient stoichiometric management promotes carbon sequestration by improving microbial nutrient availability and metabolic efficiency in straw-amended soil----中国科学院遗传发育所农业资源研究中心

科研成果

论文

论文题目	Nutrient stoichiometric management promotes carbon sequestration by improving microbial nutrient availability and metabolic efficiency in straw-amended soil
作　　者	武红亮、蔡岸冬、董文旭、邢婷婷、徐明岗、卢昌艾;
发表年度	2023
刊物名称	JOURNAL OF SOILS AND SEDIMENTS
卷、期、页码	23; 3; 1182-1192
影响因子
论文摘要	Purpose Soil enzymes are the main drivers of microbial catabolic and anabolic processes. However, the response of functional enzymes strategies and microbial metabolic efficiency (MME) to nutrient stoichiometry remains unclear in straw-amended black soil. Methods Four nutrients gradients of N0, N1, N2, and N3 were set, and N0-N3 mean straw-amended soil with increasing addition of nitrogen (N), phosphorus (P), and sulfur (S). The activities of five enzymes involved in carbon (C), N, and P acquisition were investigated under different nutrient treatments in two soils during an 84-day incubation study. Microbial nutrient availability and C use efficiency (CUE) were assessed based on enzymatic stoichiometry (ES), and their potential relationship to change net soil-C (Net-C) was then established. Results Compared to soil with straw alone, the Net-C in Gongzhuling and Hailun increased by 1.2-2.3 and 1.3-1.9 times with stoichiometric nutrient management, respectively. ES revealed that microbial metabolism was successively limited by N and P in Gongzhuling soil and was mainly limited by P in Hailun soil. Nutrient supplementation improved the MME, supported by a decrease of - 9.2% (- 3.4 to - 17.8%) in qCO(2) and an increase of 10.1% (2.9-23.6%) in CUE. Path analysis suggested that nutrient supplementation influenced Net-C by directly and positively regulating C and P acquisition EEAs and CUE. The Net-C in Gongzhuling was more sensitive to nutrient supplementation, while that in Hailun was more limited by P, indicating that microbial metabolism might be related to soil pH or clay content. Conclusions Combined addition of straw and N, P, and S improved Net-C by alleviating microbial nutrient limitation and improving CUE, in which process P acquisition enzyme, P availability, and soil properties (pH or clay content) played a key role.
全文链接	http://dx.doi.org/10.1007/s11368-022-03396-5
附件地址