Molecular-Level Insights into Phosphorus Transformation Mechanisms in Entisol Soils under Multiple Long-Term Fertilization Regimes

文献类型： 外文期刊

第一作者： Liu, Jin

作者： Liu, Jin;Han, Chaoqun;Zhao, Yuhang;Yang, Dongling;Sui, Peng;Chen, Yuanquan;Yang, Jianjun;Zheng, Lei;Hu, Yongfeng;Li, Jumei;Shi, Xiaojun;Ma, Yibing

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关键词： manure; nitrogen deficiency; NMR; XANES; straw return

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

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年卷期： 2022 年 12 卷 11 期

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收录情况： SCI

摘要： 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 P-31 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 (P-i) 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 (P-o) pools, thus providing new molecular-level insights into soil P-o 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.

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