文献类型： 外文期刊

作者： Liu, Jin ¹ ; Han, Chaoqun ¹ ; Zhao, Yuhang ¹ ; Yang, Dongling ¹ ; Yang, Jianjun ² ; Zheng, Lei ³ ; Hu, Yongfeng ⁴ ; Li, Jumei ⁵ ; Sui, Peng ¹ ; Chen, Yuanquan ¹ ; Shi, Xiaojun ⁶ ; Ma, Yibing ⁷ ;

作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing 100094, Peoples R China

2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

3.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

4.Sinopec Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

6.Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China

7.Macau Univ Sci & Technol, Macao Environm Res Inst, Macau 999078, Peoples R China

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 ）

ISSN：

年卷期： 2022 年 12 卷 11 期

页码：

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.