Speciation and sorption of phosphorus in agricultural soil profiles of redoximorphic character.
Speciation and sorption of phosphorus in agricultural soil profiles of redoximorphic character.
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DOI：
10.1007/s10653-020-00561-y
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发表时间：
2020-10
影响因子：
4.2
通讯作者：
Leinweber P
中科院分区：
文献类型：
--
作者：
Baumann K;Shaheen SM;Hu Y;Gros P;Heilmann E;Morshedizad M;Wang J;Wang SL;Rinklebe J;Leinweber P
控制排水被认为是改善作物供水和减少农田养分流失的土壤管理工具;然而，其关闭可能会影响土壤中磷（P）的流动。为了评估磷动员潜力，三个土壤剖面与氧化还原特征选择沿着轻微的丘陵在北方德国。每个剖面的三个深度的土壤样品的基本性质，总元素含量，草酸盐和连二亚硫酸盐提取的成壤铝，铁和锰（氢）氧化物，P池（顺序提取），P物种[P K-边X射线吸收近边结构（XANES）光谱]和P吸附行为。表层土壤（~ 10 cm）中，活性磷（H_2 O-P+树脂-P + NaHCO_3-P）占全磷（Pt）的26-32%。磷K边XANES显示，高达49%的Pt结合到Al和/或Fe（氢）氧化物，但连续分馏表明，> 30%的P被封闭在倍半氧化物聚集体中。磷吸附量和Freundlich方程的Kf系数（20-33）表明土壤对磷的结合能力较低。在底土层（~ 30和~ 65 cm深）中，较高比例的Al-和Fe-结合P沿着其他特征表明，所有剖面在还原条件下可能倾向于P动员/淋溶风险，即使剖面在好氧条件下的P饱和度（DPS）<25%。结果表明，关闭的控制排水可能会造成增加磷动员的风险，但这需要与不受控制的排水和磷损失的风险，以避免磷浸出到水生生态系统。本文的在线版本（10.1007/s10653-020-00561-y）包含补充材料，可供授权用户使用。
Controlled drainage is considered as a soil management tool to improve water supply to crops and reduce nutrient losses from fields; however, its closure may affect phosphorus (P) mobilization in soil. To assess the P mobilization potential, three soil profiles with redoximorphic features were selected along a slight hill in Northern Germany. Soil samples from three depths of each profile were characterized for basic properties, total element content, oxalate- and dithionite-extractable pedogenic Al, Fe and Mn (hydr)oxides, P pools (sequential extraction), P species [P K-edge X-ray absorption near-edge structure (XANES) spectroscopy] and P sorption behavior. In topsoil (~ 10 cm depth), labile P (H2O-P + resin-P + NaHCO3-P) accounted for 26–32% of total P (Pt). Phosphorus K-edge XANES revealed that up to 49% of Pt was bound to Al and/or Fe (hydr)oxides, but sequential fractionation indicated that > 30% of this P was occluded within sesquioxide aggregates. A low binding capacity for P was demonstrated by P sorption capacity and low Kf coefficients (20–33 ) of the Freundlich equation. In the subsoil layers (~ 30 and ~ 65 cm depth), higher proportions of Al- and Fe-bound P along with other characteristics suggested that all profiles might be prone to P mobilization/leaching risk under reducing conditions even if the degree of P saturation (DPS) of a profile under oxic conditions was < 25%. The results suggest that a closure of the controlled drainage may pose a risk of increased P mobilization, but this needs to be compared with the risk of uncontrolled drainage and P losses to avoid P leaching into the aquatic ecosystem. The online version of this article (10.1007/s10653-020-00561-y) contains supplementary material, which is available to authorized users.
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DOI：
10.3390/plants4020253
发表时间：
2015-05-22
期刊：
Plants (Basel, Switzerland)
影响因子：
--
作者：
Gerke J
通讯作者：
Gerke J
影响因子：
2.2
作者：
Dagnew, Awoke;Scavia, Donald;Kalcic, Margaret
通讯作者：
Kalcic, Margaret
影响因子：
6.7
作者：
Jouni, Hamidreza Javani;Liaghat, Abdolmajid;Henk, Ritzema
通讯作者：
Henk, Ritzema
影响因子：
2.4
作者：
King, Kevin W.;Williams, Mark R.;Fausey, Norman R.
通讯作者：
Fausey, Norman R.
影响因子：
11.4
作者：
Johnson JE;Savalia P;Davis R;Kocar BD;Webb SM;Nealson KH;Fischer WW
通讯作者：
Fischer WW