Contrasting effects of carbon source recalcitrance on soil phosphorus availability and communities of phosphorus solubilizing microorganisms

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:298

Article

Huang, Yanlan^1,2  Dai, Zhongmin^1,2,3  Lin, Jiahui^1,2  Qi, Qian^1,2  Luo, Yu^1,2  Dahlgren, Randy A.⁴  Xu, Jianming^1,2,3 

[1] Zhejiang Univ, Coll Environm & Resource Sci, Inst Soil & Water Resources & Environm Sci, Hangzhou 310058, Peoples R China

[2] Zhejiang Univ, Zhejiang Prov Key Lab Agr Resources & Environm, Hangzhou 310058, Peoples R China

[3] Zhejiang Univ, Rural Dev Acad, Hangzhou 310058, Peoples R China

[4] Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA

关键词: Carbon addition;    P availability;    P fractions;    Microbial activity;    Microbial community;   

DOI  :  10.1016/j.jenvman.2021.113426

来源: Elsevier

【 摘 要 】

Carbon (C) additions to soil interact through chemical and microbiological processes to cause changes in soil phosphorus (P) availability. However, the response of soil P transformations and relevant microbial communities to C additions having different degrees of recalcitrance remains uncertain. We studied the effects of glucose, hemicellulose and lignin addition on soil P availability, P transformation processes and relevant microbial activity and communities in a P-deficient flooded soil. Lignin significantly increased soil available P concentrations, which was attributed to chemical release of inorganic P and increased alkaline phosphatase activity. Glucose and hemicellulose additions stimulated microbial metabolism of C thereby enhancing microbial demand for P, with increased soil P availability especially in the early incubation period. Glucose or hemicellulose addition changed soil microbial diversity and community composition, leading to enhanced growth and interactions of P solubilizing microorganisms such as Desulfitobacterium, Bacillus and Desulfosporosinus. Our results infer the importance of pH alteration and competitive sorption between PO4 and functional groups of recalcitrant C (e.g., lignin) with Fe/Al (hydr) oxides in regulating soil P availability. Further, the microbial response to labile C additions led to increased P availability in the P-deficient soil. This study provides important mechanistic information to guide microbially-regulated soil P management in agricultural ecosystems.

【 授权许可】

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