| 灌漠土的磷素吸附特性与供磷缓冲能力的初步研究 |
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| 引用本文： | 李世清,谢恩波.灌漠土的磷素吸附特性与供磷缓冲能力的初步研究[J].甘肃农业大学学报,1990,25(2):184-190. |
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| 作者姓名： | 李世清 谢恩波 |
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| 作者单位： | 甘肃农业大学土化系，甘肃农业大学土化系，甘肃农业大学土化系 |
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| 摘 要： | 用Freundlich和Langmuir等温吸附方程能良好地描述灌漠土对磷素的吸附,相关系数在0.8以上。根据Langmuir方程计算的标准磷素需要量与土壤吸湿水、有机质和粘粒含量呈高度正相关。回归分析表明,最大缓冲容量(Mb)和吸附反应自由能(△G°)与吸湿水、有机质和粘粒含量呈高度正相关,与Olsen—P呈强负相关,与pH没有统计上显著的相关性。Mb和△G°间的相关系数达0.92。
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| 关 键 词： | 灌漠土 磷素 吸附 |
Primary Studies on the Phosphorus Sorption Characteristics and Buffering Capacity of Phosphorus Supply in Irrigated-Desert Soil |
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| Li Shiqing Xie Enbo Liu Yuming.Primary Studies on the Phosphorus Sorption Characteristics and Buffering Capacity of Phosphorus Supply in Irrigated-Desert Soil[J].Journal of Gansu Agricultural University,1990,25(2):184-190. |
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| Authors: | Li Shiqing Xie Enbo Liu Yuming |
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| Abstract: | In this paper, the irrigated-desert soil collected from Hexi corridor of Gansu was used and the phosphorus adsorption index and phosphorus fertilizer index were studied. Under the conditions presented here, the phosphorus adsorption could be well described with Freundlich and Langmuir isotherm adsorption equations and the correlation coefficient was above 0.8. Standard P requirement calculated from Langmuir equation was strongly related with the soil hygroscopic water, organic matter and clay contents. Regression analysis showed that the maximum buffering capacity(Mb) and free energy of adsorption reaction (△G°) were highly correlated with hygroscopic water, organic matter and clay content, negatively with olsen-P. There was no statistical correlation with pH. The correlation coefficient between Mb and △G° reached 0.92. |
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| Keywords: | irrigated-desert soil phosphorus adsorption |
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