农业环境科学学报2016，Vol.35Issue(12)：2367-2376,10.DOI:10.11654/jaes.2016-0862
磷与草甘膦在酸性土壤中吸附解吸交互作用机制
Competitive adsorption and desorption of glyphosate and phosphate on acid soil
摘要
Abstract
The interaction of adsorption and desorption of glyphosate and phosphoate was investigated by conducting an isothermal adsorp-tion-desorption experiment using red soil and yellow soil from Fujian Province. The results showed that the Langmuir equation best ex-plained the phosphate adsorption behavior in red soil and yellow soil affected by glyphosate. Phosphate adsorption was a spontaneous en-dothermic reaction in both red soil and yellow soil, and the spontaneous tendency of glyphosate absorption was lower as the concentration of glyphosate increased. The phosphate adsorption quantity declined with increasing glyphosate levels in red and yellow soil. Compared to con-trol, glyphosate inhibited desorption of high concentration phosphate. Moreover, the Freundlich and Langmuir adsorption isotherm equations explained the glyphosate adsorption process in both soils, and the Freundlich fitted better. In the absence of phosphate treatment, the ad-sorption of glyphosate in yellow soil was higher than red soil, but the adsorption quantity decreased with increasing concentration of phos-phate in yellow soil. The glyphosate desorption quantity did not have noticeable regularity in red soil and yellow soil, and the desorption ratio declined, which was mainly influenced by adsorption quantity. However, with increasing phosphate concentration, desorption quantity of glyphosate decreased in red soil, and the desorption ratio also accordingly declined. Under different phosphate treatments, the variation of glyphosate desorption quantity ranged from 1.83~1.83 mmol·kg-1 in yellow soil, so phosphate did not strongly affect the desorption of glyphosate in yellow soil. Therefore, glyphosate and inorganic phosphate appear to compete for the same sorption sites, hence the applica-tions of glyphosate and phosphorus may influence the bioavailability and transport potential of each other in the soil.关键词
草甘膦/磷/吸附竞争/解吸Key words
glyphosate/phosphate/competitive adsorption/disorption分类
农业科技引用本文复制引用
周垂帆,林静雯,李莹,刘爱琴..磷与草甘膦在酸性土壤中吸附解吸交互作用机制[J].农业环境科学学报,2016,35(12):2367-2376,10.基金项目
国家自然科学基金项目（31400465）；福建省自然科学基金青年基金项目（2015J05050）；中国博士后科学基金项目 （）
