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The functional role of arbuscular mycorrhizal fungi in enhancing soil organic carbon stocks and stability in dryland
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-02 , DOI: 10.1016/j.still.2024.106443
Meng-Ying Li, Wei Wang, Hai-Hong Yin, Yinglong Chen, Muhammad Ashraf, Hong-Yan Tao, Shi-Sheng Li, Wen-Ying Wang, Chang-Lang Yang, Yun-Li Xiao, Li Zhu, You-Cai Xiong

Arbuscular mycorrhizal fungi (AMF) are known to influence soil organic carbon (SOC) stock, but the mechanisms by which they affect SOC stability in the rhizosphere remains poorly understood. To address this gap, a 7-year field observation was conducted in a rainfed dryland maize field, with AMF inoculation, AMF exclusion (only benomyl treatment), and the control (no AMF and no benomyl). AMF introduction increased soil occluded particulate organic carbon (oPOC) and mineral-associated organic carbon (MAOC) contents by 15.6 % and 7.1 %, respectively, compared to the control. However, no significant changes were observed in free particulate organic carbon (fPOC) levels. As expected, AMF exclusion led to a general reduction in SOC content. Analyses of in situ13C labeling showed that AMF inoculation evidently promoted the retention of 13C in oPOC (13.6 %) and MAOC (5.4 %), thereby enhancing SOC stability. High-throughput sequencing results revealed that AMF inoculation led to significant increases in the diversity and abundance of rhizosphere fungal community, with higher co-occurrence network complexity. Meanwhile, the diversity and abundance of rhizosphere bacterial community were substantially reduced (p < 0.05). Importantly, long-term AMF inoculation was observed to weaken soil N stocks, and inhibit microbial hydrolase secretion for C sources. The findings suggest that AMF inoculation can conserve and stabilize SOC by enhancing fungal community proliferation, while reducing microbial extracellular enzyme activity through soil N depletion. Therefore, AMF can be considered rhizosphere carbon engineer that boost persistent carbon sink in drylands via selectively affecting SOC components. The findings provide new insights into global nature-based carbon neutrality strategies.

中文翻译:


丛枝菌根真菌在提高旱地土壤有机碳储量和稳定性中的功能作用



已知丛枝菌根真菌 (AMF) 会影响土壤有机碳 (SOC) 储量,但它们影响根际有机碳稳定性的机制仍然知之甚少。为了解决这一差距,在雨养旱地玉米田进行了 7 年的田间观察,接种 AMF、排除 AMF(仅苯甲酰处理)和对照(无 AMF 和苯甲酰)。与对照相比,AMF 引入土壤封闭颗粒有机碳 (oPOC) 和矿物相关有机碳 (MAOC) 含量分别增加了 15.6% 和 7.1%。然而,未观察到游离颗粒有机碳 (fPOC) 水平发生显著变化。正如预期的那样,AMF 排除导致 SOC 含量普遍减少。原位 13C 标记分析表明,AMF 接种明显促进了 13C 在 oPOC (13.6%) 和 MAOC (5.4%) 中的保留,从而提高了 SOC 的稳定性。高通量测序结果显示,AMF 接种导致根际真菌群落的多样性和丰度显著增加,共现网络复杂性更高。同时,根际细菌群落的多样性和丰度显著降低 (p < 0.05)。重要的是,观察到长期接种 AMF 会削弱土壤氮储量,并抑制微生物对 C 源的水解酶分泌。研究结果表明,接种 AMF 可以通过增强真菌群落增殖来保存和稳定 SOC,同时通过土壤氮消耗降低微生物细胞外酶活性。因此,AMF 可以被认为是根际碳工程,它通过选择性地影响 SOC 成分来促进旱地的持续碳汇。 这些发现为全球基于自然的碳中和战略提供了新的见解。
更新日期:2025-01-02
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