铁酸盐
双锰矿
化学
环境化学
矿化(土壤科学)
针铁矿
有机质
三水铝石
土壤有机质
溶解有机碳
土壤水分
土壤碳
锰
土壤科学
矿物学
环境科学
吸附
氮气
高岭石
氧化锰
有机化学
作者
Yi Zhuang,Jun Zhu,Lei Shi,Qingling Fu,Hongqing Hu,Qiaoyun Huang
标识
DOI:10.1016/j.jenvman.2021.113916
摘要
The mineralization of soil organic matter (SOM) is closely related to the emission of greenhouse gas into atmosphere and the stability of organic carbon in soil. The influence of minerals on SOM mineralization in the specific soil received very few attentions. The influence characteristics and potential mechanisms of oxides on the mineralization of SOM in the paddy soil were observed in this study by incubating soil with the addition (dosage: 10 g kg-1) of prepared gibbsite, goethite, ferrihydrite or birnessite for 60 days. A sequence control treatment (753 mg CO2-C kg-1) > goethite treatment (656 mg CO2-C kg-1) ≈ gibbsite treatment (649 mg CO2-C kg-1) > birnessite treatment (529 mg CO2-C kg-1) > ferrihydrite treatment (441 mg CO2-C kg -1) was found in the cumulative amount of released CO2 in 60 days of incubation. Oxides especially ferrihydrite significantly decreased the content of dissolved organic matter (DOM) but tended to increase the content of microbial biomass carbon (MBC). The molecular structure of DOM in the paddy soil was simplified by gibbsite, ferrihydrite and birnessite after the incubation. Oxides especially birnessite and ferrihydrite reduced soil pH and the content of soil available N but increased soil redox potential (Eh). All examined oxides especially Fe oxides enhanced soil bacterial abundance but only birnessite significantly affected bacterial composition at phyla level. The stimulation on the immobilization and/or microbial assimilation of labile organic carbon, the modulation on soil basic properties (available N, pH, Eh), and the decrease of the relative abundance of some decomposing bacteria phyla such as Actinobacteria were the potential pathways of oxides in decreasing SOM mineralization.
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