Molecular speciation and transformation of soil legacy phosphorus with and without long-term phosphorus fertilization: Insights from bulk and microprobe spectroscopy
文献类型： 外文期刊
作者：
Liu, Jin
1
;
Yang, Jianjun
2
;
Cade-Menun, Barbara J.
3
;
Hu, Yongfeng
4
;
Li, Jumei
1
;
Peng, Chang
5
;
Ma, Yibing
1
;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
3.Agr & Agri Food Canada, Swift Current Res & Dev Ctr, Box 1030, Swift Current, SK S9H 3X2, Canada
4.Univ Saskatchewan, Canadian Light Source, Saskatoon, SK S7N 2V3, Canada
5.Jilin Acad Agr Sci, Agr Environm & Resources Ctr, Jilin 130033, Jilin, Peoples R China
期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）
ISSN： 2045-2322
年卷期： 2017 年 7 卷
页码：
收录情况： SCI
摘要： Soil legacy phosphorus (P) represents a substantial secondary P resource to postpone the global P crisis. To fully utilize this P reserve, the transformation of legacy P speciation in a black soil with and without P fertilization for 27 years was investigated by chemical fractionation, molecular-level bulk (P K-edge X-ray absorption near-edge, XANES; solution P-31 nuclear magnetic resonance) and microprobe (mu-X-ray fluorescence and mu-XANES) spectroscopy. Results from both fractionation and P bulk-XANES concordantly indicated that Ca-2-P [Ca(H2PO4)(2)] acts as a reserve of labile P in response to soils with or without P fertilization. Cropping for 27 years depleted hydroxyapatite while enriched iron-bound P in soils irrespective of P application. Similar accumulation of soil organic P (P-o), probably due to root residue inputs, occurred in both soils with and without P fertilization; the accumulated P-o was present as orthophosphate diesters in soils with P fertilization more than in soils without P fertilization, suggesting that the release of labile P-o was triggered by soil P deficits. These results provide vital information for agronomically and environmentally sustainable P management by demonstrating the potential crop availability of legacy soil P, which could reduce future P fertilization.
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