数字农科院2.0

Nitrogen and phosphorus addition affected soil organic carbon storage and arbuscular mycorrhizal fungi contributions

文献类型： 外文期刊

作者： 马胜超;;郭瑞;;王悦;;闫闫;;楚倩文;;崔楠;;张义飞;;张磊;;蒋丽;;石连旋;;郭继勋;;高英志;;幸福;;张涛

关键词： Arbuscular mycorrhizal;; fungi;; Nitrogen deposition;; Phosphorus fertilization;; Soil organic carbon;; 13C isotope

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Substantial quantities of nitrogen (N) and phosphorus (P) released by human activities, enter terrestrial ecosystems, thereby affecting the carbon cycling within these ecosystems. Previous studies found that arbuscular mycorrhizal fungi (AMF) could affect soil organic carbon (SOC) storage, the impacts of AMF on SOC under nutrients enrichment have yet to be well understood. Here, we conducted an 8-year field experiment involving N and P addition, and a13C labeled microcosm experiment labeled with AMF inoculation, to explore how SOC respond to nutrients enrichment, as well as AMF-induced changes in SOC. N addition increased particulate organic carbon (POC) content by 5.03 % by promoting plant primary productivity. Phosphorus (P) addition reduced the mineral-bound organic carbon (MAOC) by 16.0 % by facilitating the microbial degradation process. Correlation analysis showed that AMF intraradical infection intensity (IRII) was positively correlated with both nitrate nitrogen (NO3− -N) and MAOC, but negatively correlated with available phosphorus (AP) and total phosphorus (TP). This result suggested that nutrients enrichment potentially modulate MAOC accumulation via affecting AMF-plant symbiosis. Furthermore, Structural equation modeling (SEM) results also showed that AMF are crucial in regulating plant and soil microbial contributions to SOC. 13C stable isotope labelling experiment results further showed that AMF inoculation increased the 13C content in the soil by 4.75 % and simultaneously increased plant N uptake by 6.32 %. Therefore, we speculated that AMF could promote the accumulation of SOC by facilitating the exchange of carbon and nitrogen between plants and soil. These findings suggest that global nutrient eutrophication could significantly affect the stability of SOC, highlighting the critical role of AMF in mediating the responses of SOC stability to environmental changes.

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