Kinetics of Phosphate Release from Three Phosphate-Treated Soils

LI Shou-Tian; ZHOU Jian-Min; WANG Huo-Yan; DU Chang-Wen; CHEN Xiao-Qin

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Kinetics of Phosphate Release from Three Phosphate-Treated Soils

机译：从三种磷酸盐处理过的土壤中释放磷的动力学

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Phosphate release from three selected soils after treatments of 1.6 and 2.4 mmol L-1 P was investigated using sequential extractions and fitted using six kinetic models, including zero order (Z), first order (F), second order (S),parabolic diffusion (PD), two constant rate (TC), and Elovich type (ET) equations. The results showed that the rate of P release was initially rapid and then gradually declined with time. Also, P release increased with added P. Total P release followed the order: paddy soil with 2.4 mmol L-1 P ＞ red soil with 2.4 mmol L-1 P ＞ paddy soil with 1.6 mmol L-1 P ＞ fluvo-aquic soil with 2.4 mmol L-1 P ＞ fluvo-aquic with 1.6 mmol L-1 P ＞ red soil with 1.6 mmol L-1 P. For the two P treatments P release from the paddy soils in the first extraction was 44.3% and 45.6% of total released P, respectively,which were higher than those from red and fluvo-aquic soils. The ratio of P release at the end of release time was 14.0%and 13.1% in the paddy soil treated with 1.6 and 2.4 mmol L-1 P, respectively, but only 5.1% and 9.2% in the red soil and 7.0% and 5.2% in the fluvo-aquic soil, respectively. Comparison of the coefficients of determination (R2) indicated that ET, TC, and PD equations could describe the P release data better than Z, F, and S equations.

机译：使用顺序萃取研究了三种选定土壤在处理1.6和2.4 mmol L-1 P后的磷酸盐释放，并使用六个动力学模型进行拟合，包括零阶（Z），一阶（F），二阶（S），抛物线扩散（PD），两个恒定速率（TC）和Elovich类型（ET）方程。结果表明，磷的释放速率最初是迅速的，然后随时间逐渐下降。另外，磷的释放随磷的添加而增加。总磷的释放顺序为：2.4 mmol L-1 P的水稻土＞ 2.4 mmol L-1 P的红土＞ 1.6 mmol L-1 P的稻土＞潮土2.4 mmol L-1 P＞潮水，1.6 mmol L-1 P＞潮土，1.6 mmol L-1P。对于两种P处理，第一次提取时从水稻土中释放的P分别为44.3％和45.6％总磷释放量分别高于红壤和潮土。在1.6和2.4 mmol L-1 P处理的水稻土中，磷释放时释放磷的比例分别为14.0％和13.1％，而在红壤中分别为5.1％和9.2％，7.0％和5.2潮水土壤中的百分比。测定系数（R2）的比较表明，ET，TC和PD方程比Z，F和S方程能更好地描述P释放数据。

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来源
《土壤圈（英文版）》 |2005年第4期|518-525|共8页
作者
LI Shou-Tian; ZHOU Jian-Min; WANG Huo-Yan; DU Chang-Wen; CHEN Xiao-Qin;
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作者单位

Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 China;

Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 China;

Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 China;

Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 China;

Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类土壤学;
关键词
fluvo-aquic soil; paddy soil; phosphate; red soil; release kinetics;

机译：潮土;水稻土;磷酸盐;红壤;释放动力学;

Kinetics of Phosphate Release from Three Phosphate-Treated Soils

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