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Solute transport and extraction by a single root in unsaturated soils: model development and experiment

机译：单一根在非饱和土壤中的溶质运移与萃取：模型开发与实验

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摘要

A contaminant transport model was developed to simulate the fate and transport of organic compounds such as TNT (2,4, 6-trinitrotoluene), using the single-root system. Onions were planted for this system with 50-ml plastic tubes. Mass in the soil, soil solution, root and leaf was monitored using ~(14)C-TNT. Model parameters were acquired from the experiments in the single-root system and were used to simulate total TNT concentration in soil, providing the average concentrations in the rhizosphere and bulk soil as well as root and leaf compartments. Because the existing RCF (root concentration factor) and TSCF (transpiration stream concentration factor) equations based on log K_(ow) (octanol—water partition coefficient) were not correlated to TNT uptake, a new term, root uptake rate (R_(ur)), and a new T_(scf) equation, based on the experimental data, were introduced in the proposed model. The results from both modeling and experimental studies showed higher concentrations of TNT in the rhizosphere than in the bulk soil, because mass transported from the surrounding soil into the rhizosphere was higher than that by root uptake.
机译：建立了污染物迁移模型，以使用单根系统模拟有机化合物（如TNT（2,4,6-三硝基甲苯））的命运和迁移。用50毫升塑料管为该系统种植洋葱。使用〜（14）C-TNT监测土壤，土壤溶液，根和叶中的质量。模型参数是从单根系统的实验中获得的，用于模拟土壤中的总TNT浓度，提供了根际和散装土壤以及根和叶室的平均浓度。由于基于log K_（ow）（辛醇-水分配系数）的现有RCF（根系浓度因子）和TSCF（蒸腾流浓度因子）方程与TNT吸收无关，因此，新术语根吸收率（R_（ur ）），并在实验数据的基础上引入了一个新的T_（scf）方程。建模和实验研究的结果均表明，根际中TNT的浓度高于块状土壤中的TNT浓度，因为从周围土壤转运到根际的质量高于根吸收量。

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