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Contrasting effects of carbon source recalcitrance on soil phosphorus availability and communities of phosphorus solubilizing microorganisms
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2021-07-31 , DOI: 10.1016/j.jenvman.2021.113426
Yanlan Huang 1 , Zhongmin Dai 2 , Jiahui Lin 1 , Qian Qi 1 , Yu Luo 1 , Randy A Dahlgren 3 , Jianming Xu 2
Affiliation  

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.



中文翻译:

碳源逆反对土壤磷有效性和溶磷微生物群落的影响对比

添加到土壤中的碳 (C) 通过化学和微生物过程相互作用,导致土壤磷 (P) 有效性发生变化。然而,土壤 P 转化和相关微生物群落对具有不同反抗程度的 C 添加的响应仍然不确定。我们研究了葡萄糖、半纤维素和木质素添加对缺磷淹没土壤中土壤磷有效性、磷转化过程和相关微生物活动和群落的影响。木质素显着增加土壤有效磷浓度,这归因于无机磷的化学释放和碱性磷酸酶活性的增加。葡萄糖和半纤维素的添加刺激了 C 的微生物代谢,从而增加了微生物对 P 的需求,增加了土壤 P 的可用性,尤其是在孵化早期。脱硫杆菌芽孢杆菌脱硫孢子菌。我们的结果推断出 PO 4和顽固性 C 的官能团(例如木质素)与 Fe/Al(氢)氧化物之间的 pH 改变和竞争吸附在调节土壤 P 可用性方面的重要性。此外,微生物对添加不稳定碳的反应导致缺磷土壤中磷的可用性增加。该研究为指导农业生态系统中微生物调控的土壤磷管理提供了重要的机制信息。

更新日期:2021-08-01
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