Mechanism of increased soil phosphorus availability in a calcareous soil by ammonium polyphosphate

文献类型： 外文期刊

第一作者： Yuan, Taiyan

作者： Yuan, Taiyan;Ji, Lingmei;Xu, Dehua;Zhang, Zhiye;Yan, Zhengjuan;Wang, Xinlong;Chen, Shuo;Zhang, Yunhong;Dari, Biswanath;Sihi, Debjani

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关键词： Polyphosphate; Biologically based P; Adsorption-desorption; phoD gene; pqqC gene

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.605； 五年影响因子：7.116 ）

ISSN： 0178-2762

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收录情况： SCI

摘要： Ammonium polyphosphate (APP) is currently being increasingly used as source of phosphorus (P) fertilizer worldwide and has exhibited positive effects on soil P availability in calcareous soils. However, the mechanisms of APP-induced abiotic and biotic transformations of soil P remain elusive. Influences of APP application on P transformation in a calcareous soil were investigated in comparison to monoammonium phosphate (MAP). The application of APP significantly increased soil Olsen-P by 61.3% relative to MAP application. Specifically, APP application (i) significantly increased biologically-based P corresponding to P extracted by CaCl2, citric acid, and enzyme; (ii) increased labile Ca-P proportion (NaHCO3 extractable P) while decreased stable Ca-P proportion (H2SO4 extractable P); (iii) decreased organic P (P-o) content. In APP-treated soil, the decrease in pH, crystal Fe and Al oxides together with the increase in organic C and complex Fe oxides contributed to the P sorption decrease and P desorption/dissolution increase. Meanwhile, APP significantly increased alkaline phosphatase activity and phoD gene abundance, which contributed to P-o mineralization increase. Additionally, APP changed beta-diversity and increased the relative abundance of Rhodobacterales and Myxococcales harboring pqqC gene, indicating the contribution of P solubilizing bacteria to inorganic P (P-i) dissolution. Redundancy analysis showed that soil pH can explain 70.4, 53.8, and 55.1% of the total variances observed in the composition of BBP, P-i and soil P sorption-desorption parameters, respectively. This suggests that the change of soil pH from APP application in this calcareous soil altered soil abiotic and biotic P transformation processes, promoting soil P availability.

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