Molecular-Level Insights into Phosphorus Transformation Mechanisms in Entisol Soils under Multiple Long-Term Fertilization Regimes
Molecular-Level Insights into Phosphorus Transformation Mechanisms in Entisol Soils under Multiple Long-Term Fertilization Regimes
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DOI：
10.3390/agronomy12112760
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发表时间：
2022-11
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通讯作者：
Jin Liu;Chaoqun Han;Yuhang Zhao;Dongling Yang;Jianjun Yang;Lei Zheng;Yongfeng Hu;Ju-mei Li;P. Sui;Yuanquan Chen;Xiaojun Shi;Yibing Ma
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作者：
Jin Liu;Chaoqun Han;Yuhang Zhao;Dongling Yang;Jianjun Yang;Lei Zheng;Yongfeng Hu;Ju-mei Li;P. Sui;Yuanquan Chen;Xiaojun Shi;Yibing Ma
改善磷肥策略有利于缓解未来全球磷短缺和减少农业用地遗留磷损失风险。本研究探讨了包括PK在内的多种长期施肥制度下土壤中磷的分子转化机制；NK;氮磷钾;猪粪氮磷钾（NPKM）；采用顺序分选（SF）、同步加速器k -边缘x射线吸收近边缘结构（P- xanes）和溶液31P核磁共振（P- nmr）技术研究了水稻秸秆还田（NPKS）对氮磷钾和氮磷钾的影响。与常规氮磷钾施肥相比，PK、NPKM和NPKS处理的土壤全磷积累量更高。结果表明，与NPK （23.3 mg/kg）处理相比，PK （52.5 mg/kg）和NPKM （35.5 mg/kg）处理土壤nahco3萃取无机磷（Pi）组分含量相对较高。P- xanes分析一致表明，与NPK处理相比，PK和NPKM处理下土壤中作为生物有效磷形态的刷子石的比例更高，表明PK和NPKM处理下Entisol土壤中磷有效度更高。P- nmr结果表明，与NPK施肥相比，长期PK施肥导致校正后的正磷酸盐二酯与正磷酸盐单酯的比例相对较高，这强烈表明缺氮提高了土壤有机磷（Po）库的生物降解性，从而为土壤Po转化提供了新的分子水平的认识。通过长期的试验研究，这些结果有助于全面了解不同施肥制度下土壤磷的有效性和转化机制，从而有利于农业土壤施肥策略的改进。
Improving phosphorus (P) fertilization strategies benefits mitigating future global P shortage and reducing legacy P loss risk in agricultural lands. In this study, the molecular transformation mechanisms of P in Entisol soils under multiple long-term fertilization regimes including PK; NK; NPK; NPK with pig manure (NPKM); and NPK with rice straw return (NPKS) were investigated by sequential fractionation (SF), synchrotron-based P K-edge X-ray absorption near-edge structure (P-XANES) and solution 31P nuclear magnetic resonance (P-NMR) spectroscopy. Compared with conventional NPK fertilization, a higher accumulation of total P occurred in soils under the PK, NPKM and NPKS treatments. By SF, there were relatively higher contents of NaHCO3-extracted inorganic P (Pi) fractions for the soils under PK (52.5 mg/kg) and NPKM (35.5 mg/kg) fertilization relative to the NPK (23.3 mg/kg) treatment. Consistently, P-XANES analysis revealed that there was a higher proportion of brushite, as a bioavailable P form, in soil under the PK and NPKM treatments compared with the NPK treatment, indicating higher P availability in the Entisol soils under PK and NPKM fertilizations. By P-NMR, long-term PK fertilization resulted in relatively a higher ratio of orthophosphate diesters to orthophosphate monoesters after correction compared with the NPK fertilization, which strongly suggested that N deficiency enhanced the biodegradability of soil organic P (Po) pools, thus providing new molecular-level insights into soil Po transformation. Collectively, these results, obtained from a long-term experimental study, facilitates the comprehensive understanding of P availability and transformation mechanisms in Entisol soils under multiple fertilization regimes, and thus benefits the improvement of fertilization strategies in agricultural soils.