Modeling Heavy Metal (Cadmium) Uptake by Soil‐Plant Root System
Modeling Heavy Metal (Cadmium) Uptake by Soil‐Plant Root System
复制标题
模拟土壤-植物根系吸收重金属（镉）的情况
DOI：
10.1061/(asce)0733-9437(1994)120:1(89
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
S. Mathur
中科院分区：
文献类型：
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作者：
Sandhya Rao;S. Mathur
在污染植物并进入食物链从而对人类造成健康问题的各种有毒物质中，重金属的作用尤其严重。在过去的十年里，污泥和工业废物中的重金属在农业实践中的行为一直是人们关注的焦点。在这些重金属中，镉由于其对人体的毒性而被确定为最关键的金属。镉的存在及其在植物根区的积累也会导致作物产量下降。本研究建立了一种模拟镉在土壤水中的迁移和植物根系吸收的方法。将含根萃取项的非饱和水流方程与质量输运方程和溶质浓度质量平衡方程耦合。该模型考虑了根系随时间的生长。根际土壤水分运动和溶质（镉）运动的宏观模型产生一组偏微分方程。
Among various toxic substances that contaminate plants and enter the food chain, thereby posing health problems to human beings, heavy metals are particularly severe in their action. The behavior of heavy metals present in sewage sludge and industrial wastes that are used in agricultural practices has been the center of much attention during the last decade. Among these heavy metals, cadmium has been identified as the most critical metal due to its human toxicity. The presence of cadmium and its accumulation in the plant root zone also results in decreased crop yield. This study develops a methodology to simulate the transport of cadmium in soil water and its uptake by plant roots. The transient unsaturated water flow equation with a root extraction term is coupled with mass transport equation and mass balance of solute concentration. The model takes into account the root growth with time. The macroscopic root‐soil water flow and solute (cadmium) movement model yields a set of partial differential equatio...