Changes in Phosphorus Fractions, pH, and Phosphatase Activity in Rhizosphere of Two Rice Genotypes

文献类型： 外文期刊

第一作者： Li Yong-Fu

作者： Li Yong-Fu;Luo An-Cheng;Yao Xu-Guo;Li Yong-Fu;Wei Xing-Hua

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关键词： genotype;rhizosphere;soil pH;mineralization

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

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收录情况： SCI

摘要： A rhizobox experiment with two phosphorus (P) treatments, zero-P (0 mg P kg(-1)) and plus-P (100 mg P kg(-1)) as Ca(H2PO4)(2)center dot H2O, was conducted to study the chemical and biochemical properties in the rhizosphere of two rice genotypes (cv. Zhongbu 51 and Pembe) different in P uptake ability and their relationship with the depletion of soil P fractions. Plant P uptake, pH, phosphatase activity, and soil P fractions in the rhizosphere were measured. Both total dry weight and total P uptake of Pembe were significantly (P < 0.05) higher than those of Zhongbu 51 in the zero-P and plus-P treatments. Significant depletions of resin-P-i, NaHCO3-P-i, NaHCO3-P-o and NaOH-P-i, where P-i stands for inorganic P and P-o for organic P, were observed in the rhizosphere of both Zhongbu 51 and Pembe under both P treatments. Pembe showed a greater ability than Zhongbu 51 in depleting resin-P-i, NaHCO3-P-i, NaHCO3-P-o, NaOH-Pi, and NaOH-P-o in the rhizosphere. HCl-P-i and residual-P were not depleted in the rhizosphere of both genotypes, regardless of P treatments despite significant acidification in the rhizosphere of Pembe under zero-P treatment. Higher acid phosphatase (AcPME) activity and alkaline phosphatase (AIPME) activity were observed in the rhizosphere of both Zhongbu 51 and Pembe compared to the corresponding controls without plant. AcPME activity was negatively (P < 0.01) correlated to NaHCO3-P-o concentration in the rhizosphere of both Zhongbu 51 and Pembe, suggesting that AcPME was associated with the mineralization of soil organic P.

分类号： S15

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