数字农科院2.0

Sustainable potassium management with green manure reshapes microbial nitrogen cycling to enhance potato yield

文献类型： 外文期刊

作者： Ning, Linyirui;Xu, Xinpeng;Ma, Long;Wang, Xiya;Yin, Mei;He, Ping;Zhou, Wei

作者机构：

关键词： Potassium fertiliser;Green manures;Soil N-cycling;Microbial functions

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年 398 卷

页码：

收录情况： SCIE（2025版）

摘要： Long-term intensive potato farming leads to potassium depletion and nitrogen imbalance in the soil. However, the microbial mechanisms linking potassium management to nitrogen cycling remain unclear. Through a decade-long field study using metagenomic analysis, we uncovered how gradient potassium fertilisation (K0, K90, K180, and K360) and green manure (M90 and K90M90) influence soil nitrogen metabolism via microbial functional networks. Potassium application induced microbial functional redundancy by altering nitrogen metabolic gene profiles. Specifically, K amendment significantly reduced nitrification genes (amoA/B/C, hao) and denitrification (nirK/S, norB, and nosZ) genes, and enhanced assimilatory (nasA/B) and dissimilatory nitrate reduction (nirB/D, narG/H/I) genes. This regulation suppressed nitrification and denitrification, reducing gaseous N loss and prolonging nitrate availability via dual-reduction pathways. Fertiliser-responsive microbial taxa (for example, Nocardioidaceae and Kribbellaceae) exhibited abundance dynamics coupled with available potassium (AK), mineral-associated organic carbon (MAOC), and organic nitrogen (MAON), collectively enhancing potato yield. Integrated potassium-green manure strategies increase potassium bioavailability and nitrogen fixation capacity by reshaping microbial functional communities. Our findings demonstrate that optimised K management mediates microbiome-driven nitrogen conservation, achieving synergies between crop yield (62-119 % increase) and agroecosystem sustainability. This study provides mechanistic insights for the development of potassium/ nutrient stewardship strategies through targeted microbial manipulation in intensive cropping systems.

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