数字农科院2.0

Inorganic phosphorus fractionation and its translocation dynamics in a low-P soil

文献类型： 外文期刊

作者： Yang, J. C.;Jiang, N. M.;Zhang, J. F.;Pan, R.;Lu, C.;Li, L. L.;Wang, Z. G.;Zhou, J.;Han, Z.;Ge, C. L.

作者机构：

关键词： ~(32)P;soil;low-phosphorus;P fractionation;translocation dynamics;i-value

期刊名称： JOURNAL OF ENVIRONMENTAL RADIOACTIVITY

ISSN：

年卷期：

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收录情况： SCI

摘要： The translocation of different inorganic phosphorus (Pi) forms in a low-P soil (Langfang experimental station, Hebei province, China) over time was investigated using P fractionation extraction and a ~(32)P tracer technique. The t-value and P availability of the soil was assessed using 5 different maize genotype (Zea mays L) cultivars. The results showed that the different Pi fractions in the soil increased in the order of H_2SO_4-extractable P (Ca_(10)-P) > Na_3C_6H_5O_7-Na_2S_2O_4-extractable P (O-P) > NH_4Ac-extractable P (Ca_8 -P) > NaHCO_3-extractable P (Ca_2-P), NH_4F-extractable P (Al-P), NaOH-Na_2CO_3-extractable P (Fe-P), and the content of plant-unavailable P (Ca_(10)-P + O-P) was high, up to 79.1% , which might be an important reason for P deficiency in this low-P soil. The ~(32)P tracer results showed that after the addition of ~(32)P-Pi to the soil with no P fertilizer applied for 25 d, 29.0% of ~(32)P was quickly transformed into Ca_2-P (rapidly available P), and 66.1% of ~(32)P was transformed into Al-P, Fe-P and Ca_8-P (slowly available P). Only 5.0% of ~(32)P was transformed into O-P and Caio-P (plant-unavailable P). Moreover, in the soil with P fertilizer applied, ~(32)P transformation into Ca_2-P increased, and the transformation into Cag-P + Fe -P + AL-P and O-P, Caio-P significantly decreased compared to the soil with no P fertilizer applied (p < 0.05). This result suggested a higher rate for water-soluble P transformation to slowly available and plant-unavailable P in P deficient soil than in soil with sufficient P. The results of maize t-value determination showed that different genotype maize cultivars had different soil P-use efficiency and low-P tolerance mechanisms. Low-P tolerant cultivar DSY-32 regulated soil P-use efficiency and plant P content according to exogenous P fertilizer application. However, another low-P tolerant cultivar, DSY-2, used soil P more efficiently, regardless of the application of exogenous P.

分类号： X

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