一个定量植物吸收土壤重金属的原理模型

本文根据土壤重金属向植物体转移的机理，提出了一个土壤－植物系统中元素解吸、迁移、吸收的联合数学模型，推导出植物吸收量与土壤溶液浓度、缓冲能力系数、扩散系数、根系总长度、平均半径、植物蒸腾量、生长时间等参数的定量关系式。用该模型计算的植物吸镉量与盆栽黑麦草实际吸镉量之间具有很高的相关性和较好的准确度。

A MECHANlSTIC MATHEMATICAL MODEL FOR PREDICTING THE UPTAKE OF HEAVY METALS BY PLANTS

The paper put forward a coupled mathematical model of element desorption,transfer and root uptake of heavy metals in soilplant systems,and gives the theoretical quantitative relationships between the plant uptake,on the one hand,and soil solution concentration,soil buffer power,diffusion coefficient,total root length,average radius,water transpiration and growth time on the after.The pot experiments showed that the calculated uptake with this model was highly correlated with the actual uptake of cadmium by ryegrass,and the model could be used to predict rather well th0 effective uptake.