Long-term biogas slurry application increases microbial necromass but not plant lignin contribution to soil organic carbon in paddy soils as regulated by fungal community

土壤碳 土壤水分 沼气 木质素 化学 固碳 有机质 农学 土壤有机质 环境科学 泥浆 微生物种群生物学 环境化学 氮气 环境工程 生态学 土壤科学 生物 细菌 遗传学 有机化学
作者
Zhaoming Chen,Jinlong Ma,Junwei Ma,Jing Ye,Qihao Yu,Ping Zou,Wanchun Sun,Hui Lin,Weiyue Feng,Xinlin Zhao,Qiang Wang
出处
期刊:Waste Management [Elsevier BV]
卷期号:175: 254-264 被引量:1
标识
DOI:10.1016/j.wasman.2024.01.011
摘要

Biogas slurry (BS) is widely considered as a source of organic matter and nutrients for improving soil organic carbon (SOC) sequestration and crop production in agroecosystems. Microbial necromass C (MNC) is considered one of the major precursors of SOC sequestration, which is regulated by soil microbial anabolism and catabolism. However, the microbial mechanisms through which BS application increases SOC accumulation in paddy soils have not yet been elucidated. A 12-year field experiment with four treatments (CK, no fertilizers; CF, chemical fertilizer application; BS1 and BS2, biogas slurry application at two nitrogen rates from BS) was conducted in rice paddy fields. The results showed that long-term BS application had no effect on lignin phenols proportion in SOC relative to CF. In contrast, BS application elevated the MNC contribution to SOC by 15.5–20.5 % compared with the CF treatment. The proportion of fungal necromass C (FNC) to SOC increased by 16.0 % under BS1 and by 25.8 % under BS2 compared with the CF treatment, while no significant difference in bacterial necromass C (BNC) contribution to SOC was observed between the BS and CF treatments. The MNC was more closely correlated with fungal community structures than with bacterial community structures. We further found that fungal genera, Mortierella and Ciliophora, mainly regulated the MNC, FNC and BNC accumulation. Collectively, our results highlighted that fungi play a vital role in SOC storage in paddy soils by regulating MNC formation and accumulation under long-term BS application.
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