摘要
磷是作物生长发育的必要养分,喀斯特地区的土壤中碳酸钙是主要的磷吸附基质,使得喀斯特土壤中可利用的磷含量低。农作物根的分泌物在活化磷的过程中起重要作用。利用平衡法模拟喀斯特地区土壤在有根分泌物存在时的磷吸附反应。结果表明,玉米根分泌物能抑制土壤对磷的吸附,即使得土壤中可供作物利用的磷增加。土壤对磷的等温吸附反应能被Freundlich方程很好地拟合,拟二级速率方程是描述土壤对磷的吸附动力学的最优方程。
Phosphorus is the necessary nutrient in growing process of crop. Calcium carbonate in soil is the primary adsorption material in karst area, therefore, the concentration of available phosphorus in the soil is low. The root exudates of crop played an important role in the process of phosphorus mobilization. The balance method was used to simulate the adsorption reaction of phosphorus in karst soil under the existing of root exudates. Result showed that root exudates of maize could restrain the phosphorus adsorption in karst soil, and the concentration of available phosphorus increased. Langmuir equation and Freundlich equation could describe phosphorus adsorption in karst soil, and Freundlich equation was better. Imitating secondary velocity equation was the best equation to describe the adsorption kinetics of phosphorus by soils.
出处
《安徽农业科学》
CAS
北大核心
2008年第26期11453-11455,共3页
Journal of Anhui Agricultural Sciences
关键词
玉米根分泌物
喀斯特地区土壤
磷
吸附
Root exudates of maize
Soil in karst area
Phosphorus
Adsorption
