Speciation and Microscale Distribution of Phosphorus Compounds Accumulated in Continuously Fertilized Greenhouse Soils
Speciation and Microscale Distribution of Phosphorus Compounds Accumulated in Continuously Fertilized Greenhouse Soils
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连续施肥温室土壤中磷化合物的形态和微尺度分布
DOI：
10.1002/saj2.20553
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发表时间：
2023
影响因子：
2.9
通讯作者：
Masahiro Kasuya
中科院分区：
文献类型：
--
作者：
Noriko Yamaguchi;Atsuko Hikono;Aomi Suda;Saeko Yada;Yohey Hashimoto;Masatoshi Ohshima;Taku Yamamoto;Kaori Ando;Masahiro Kasuya
磷肥的过度使用导致土壤中积累过剩的磷（P）化合物，这种趋势在温室种植中尤为严重。我们的目的是通过比较从温室和露天场地收集的土壤样品中磷化合物的形态来表征温室土壤中的磷化合物。考虑了两种具有不同磷酸盐吸附能力的土壤类型，即 Ultisol 和 Andisol。通过酸提取对土壤进行大量分析来表征土壤中的磷化合物；通过固态31P核磁共振和P K边缘X射线吸收近边缘结构进行分子尺度分析，并通过电子探针微量分析仪和微X射线吸收近边缘结构进行空间分辨分析。光谱结果表明，与露天土壤相比，温室土壤中存在更大比例的与钙相关的无机磷化合物 (Ca-P) 相关的磷化合物。温室 Andisol 中的一些磷化合物是 Ca-P，尽管 Andisol 由于含有丰富的含铝吸附剂而具有高磷酸盐吸附能力。在温室 Ultisol 土壤颗粒中发现微尺度的不均匀分布的磷酸钙斑点，很可能是羟基磷灰石或磷酸三钙。除了检测到难溶性 Ca-P 外，更大比例的 Ca-P 可能是植物可利用的。空间分辨分析表明，含有 Ca-P 的有机改良剂已融入 Andisol 土壤颗粒中。我们的研究表明，即使在温室条件下具有高磷酸盐吸附能力的土壤中，具有不同溶解度的Ca-P也可以作为磷酸盐的来源。
The overuse of phosphate fertilizer results in the accumulation of surplus phosphorus (P) compounds in soil, and this trend is particularly intense in greenhouse farming. We aimed to characterize P compounds in greenhouse soils by comparing their speciation in soil samples collected from greenhouses and an open field. Two soil types with different phosphate sorption abilities, namely, Ultisol and Andisol, were considered. Phosphorus compounds in the soil were characterized by bulk soil analysis via acid extraction; molecular‐scale analyses by solid‐state31P nuclear magnetic resonance and P K‐edge X‐ray absorption near edge structure and spatially resolved analyses by electron probe microanalyzer and micro‐X‐ray absorption near edge structure. Spectroscopic results showed that a larger proportion of P compounds associated with inorganic P compounds associated with calcium (Ca‐P) was present in the greenhouse soil than in the open‐field soil. Some P compounds in the greenhouse Andisol were Ca‐P, even though Andisol has a high phosphate sorption ability due to an abundance of aluminum‐bearing sorbents. Heterogeneously distributed spots of Calcium phosphate, most likely hydroxyapatite or tricalcium phosphate, were found at the microscale in the greenhouse Ultisol soil grain. In addition to the detection of poorly‐soluble Ca‐P, a larger proportion of Ca‐P was potentially plant available. Spatially resolved analyses showed that organic amendments containing Ca‐P were incorporated into the Andisol soil grains. Our study demonstrated that Ca‐P with different solubilities can serve as a source of phosphate even in soils of high phosphate sorption ability under greenhouse conditions.