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研究了不同质地棉田土壤对磷吸附与解吸的影响。结果表明:不同质地磷素等温吸附曲线与Langmuir、Temkin和Freundlich方程拟合度都达极显著水平,尤以Langmuir方程拟合度最高,相关系数均在0.94以上;磷吸持指数(PSI)、土壤最大缓冲容量(MBC)和吸附量均随粘粒含量的增加而增大,即粘土>壤土>砂壤土,而易解吸磷(RDP)、解吸量、解吸率和标准需磷量(SPR)呈下降趋势,即砂壤土>壤土>粘土。以Langmuir方程估算棉田土壤的需磷量,砂壤质棉田需磷量为12.87mgkg-1,壤质棉田需磷量为12.66mgkg-1,粘质棉田需磷量为10.00mgkg-1。
The effects of different soil texture on phosphorus adsorption and desorption were studied. The results showed that the adsorption isotherms of Langmuir, Temkin and Freundlich equation of isotherm adsorption curves of different textures all reached the extremely significant level, especially the Langmuir equation had the highest fitting degree, the correlation coefficients were both above 0.94; the PSI, The maximum buffer capacity (MBC) and sorption amount of soil all increase with the increase of clay content, ie clay> loam> sandy loam, while RDP, desorption, desorption and standard phosphorus demand (SPR) Showing a downward trend, namely sandy loam> loam> clay. Phosphorus requirement of cotton soil was estimated by Langmuir equation. Phosphorus requirement was 12.87mgkg-1 in sandy loamy soil, 12.66mgkg-1 in loamy cotton soil and 10.00mgkg-1 in clayy cotton field.