矿化(土壤科学)
环境化学
土壤水分
氮气循环
碳纤维
土壤碳
氮气
化学
微生物种群生物学
土壤有机质
环境科学
土壤科学
地质学
材料科学
细菌
古生物学
有机化学
复合材料
复合数
作者
Xu Wang,Chao Wang,Xianlei Fan,Lifei Sun,Changpeng Sang,Xugao Wang,Ping Jiang,Yunting Fang,Edith Bai
摘要
Abstract Evidence is emerging that microbial products and residues (necromass) contribute greatly to stable soil organic matter (SOM), which calls for the necessity of separating the microbial necromass from other SOM pools in models. However, the understanding on how microbial necromass stabilizes in soil, especially the mineral protection mechanisms, is still lacking. Here, we incubated 13 C‐ and 15 N‐labelled microbial necromass in a series of artificial soils varying in clay minerals and metal oxides. We found the mineralization, adsorption and desorption rate constants of necromass nitrogen were higher than those of necromass carbon. The accumulation rates of necromass carbon and nitrogen in mineral‐associated SOM were positively correlated with the specific surface area of clay minerals. Our results provide direct evidence for the protection role of mineral in microbial necromass stabilization and provide a platform for simulating microbial necromass separately in SOM models.
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