Molecular-level understanding of phosphorus transformation with long-term phosphorus addition and depletion in an alkaline soil
Molecular-level understanding of phosphorus transformation with long-term phosphorus addition and depletion in an alkaline soil
复制标题
碱性土壤中长期磷添加和消耗对磷转化的分子水平理解
DOI：
10.1016/j.geoderma.2019.06.024
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发表时间：
2019-11-01
期刊：
影响因子：
6.1
通讯作者：
Ma, Yibing
中科院分区：
文献类型：
--
作者：
Liu, Jin;Sui, Peng;Ma, Yibing
随着磷资源压力的增加和全球水体富营养化的加剧，对不同长期施肥制度下农业土壤中磷的性质和去向的深入了解推动了土地可持续管理的发展。使用散装（溶液P-31核磁共振; P K-边缘X射线吸收近边缘，XANES）和微（X射线荧光和XANES）光谱技术，我们调查了分子形态的P在碱性土壤中的地块下小麦-玉米轮作与化学磷肥26年，自1990年以来。长期试验结果表明，磷的积累和下降主要是在无机形态响应的磷添加和亏损。磷的加入增加了磷的积累形式的透钙磷石和脱氧核糖核酸，优先耗尽没有P此外，表明这些物种的植物有效性。虽然磷的形式，如羟基磷灰石和正磷酸单酯下磷肥施肥增加，没有显着的消耗，这些P的形式时，观察到磷肥被扣留。与此相反，铁相关的P增加和不施磷肥。这些结果从这个长期的实验地点促进了解的动态和可用性的肥料P和现有的遗产P在土壤中，具有重要意义的可持续磷管理在这些土壤和类似的土壤在其他地区。
With the increasing pressure on phosphorus (P) resources and global water eutrophication, the development of sustainable land management is pushed forward by detailed knowledge on the nature and fate of phosphorus (P) in agricultural soils under various long-term fertilizer regimes. Using bulk- (solution P-31 nuclear magnetic resonance; P K-edge X-ray absorption near-edge, XANES) and micro- (X-ray fluorescence and XANES) spectroscopic techniques, we investigated the molecular speciation of P in an alkaline soil from plots under wheat-maize rotation with or without chemical P fertilizers for 26 years, since 1990. The long-term experimental results show that P buildup and drawdown were mainly in the inorganic forms in response to P addition and depletion. The added P increased P accumulation in the forms of brushite and deoxyribonucleic acid that preferentially depleted without P addition, indicating that these species were phytoavailable. Although P forms as hydroxyapatite and orthophosphate monoesters were increased under P fertilization, no significant depletions of these P forms were observed when P fertilization was withheld. In contrast, iron-associated P increased with and without P fertilization. These results from this long-term experimental site facilitate understanding of dynamics and availability of fertilizer P and the existing legacy P in soils, with important implications for sustainable P management in these soils and similar soils in other regions.