The chemical nature of soil phosphorus in response to long-term fertilization practices: Implications for sustainable phosphorus management

文献类型： 外文期刊

第一作者： Liu, Jin

作者： Liu, Jin;Han, Chaoqun;Sui, Peng;Chen, Yuanquan;Zhao, Yuhang;Yang, Jianjun;Cade-Menun, Barbara J.;Hu, Yongfeng;Li, Jumei;Liu, Hua;Ma, Yibing

作者机构：

关键词： Soil; Manure; Molecularspeciation; SolutionP-NMR; P-XANES; Newberyite

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2020 年 272 卷

页码：

收录情况： SCI

摘要： Developing sustainable phosphorus (P) management strategies is a worldwide challenge in the face of growing food demand, dwindling rock phosphate resources, and deteriorating environmental quality. This requires improved knowledge on the effect of current fertilization practices on long-term P accumulation, bioavailability and mobility, which are functions of the chemical nature of soil P. Using state-of-the-art techniques such as solution P-31-NMR and P K-edge XANES spectroscopy, combined with sequential fractionation, this study investigated the chemical speciation and transformation of P in soils under three fertilization treatments (no fertilization, CK; chemical nitrogen (N), P and potassium (K) fertilization, NPK; and partial substitution of chemical fertilizer with sheep manure, NPKM) from a long-term experiment in China initiated in 1990. Compared to the NPK soil, total P and organic P (P-o) concentrations were lower in the NPKM soil in the sampling years of 2000 and 2015, suggesting reduced P accumulation under the NPKM treatment. The NaHCO3-extracted P, considered the most readily plant-available P fraction, significantly increased in the NPKM soil relative to the NPK soil in 2000. The P-XANES results revealed the formation of the magnesium (Mg)-P compound newberyite, which probably contributed to soil P availability with NPKM application. Moreover, P-NMR analysis showed higher deoxyribonucleic acid content and ratio of orthophosphate diesters to monoesters in the NPKM soil relative to the NPK soil, which implied the stronger soil P-o lability with NPKM fertilization. This study provides new insights on the significant role of NPKM treatment in optimizing soil P fertilization regimes, which benefits sustainable crop production. Crown Copyright (C) 2020 Published by Elsevier Ltd. All rights reserved.

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