污染物在根-土界面的化学行为与生态效应

Chemical behavior and ecological effects of pollutants acting on root-soil interface

根 土界面是污染物进入植物体内的主要通道和导致一系列生态安全问题的特殊微生态区 .本文提出污染物在根 土界面上的化学行为和生态效应包括根际化学行为与生态效应 ,根系化学行为与生态效应两个方面的具体内容 ,并从理论上根据最新的研究进展对这两方面内容进行了探讨 ,指出根际化学行为与生态效应包括根际 pH环境与吸附行为、根际氧化 还原行为、根际化学致毒效应、根际微生物效应及根际生物酶反应等 ;根系化学行为与生态效应包括根系分泌物、根系酶系统的影响、干扰正常生理过程、改变细胞结构与功能、干扰生物大分子的结构和功能等 .并阐述根

Root-soil interface is the main entrance of pollutants intruding into plant tissues and the special micro-ecosphere that can result in a series of ecological safety problems. In this review, the concept of root-soil interface is presented and it is suggested that root-soil interface behavior and effects of chemical pollutants should be grouped into two aspects as rhizosphere chemical behavior and ecological effects and root chemical behavior and ecological effects.These two aspects are theoretically discussed according to the latest research advances.Rhizosphere chemical behavior and ecological effects included rhizosphere pH environment and adsorptive behavior, rhizosphere oxidation-reduction behavior, rhizosphere chemical toxicology effects, rhizosphere microbiological effects,and rhizosphere bioenzymatic reaction etc.,and root chemical behavior and ecological effects included root exudation, influence of enzymatic systems in roots, disturbance of normal physiological processes, change of cellular structure and function,and interference of structure and function of biological macromolecules.Particular attention should be paid to the significance as well as some problems of research on chemical behavior and ecological effects of pollutants acting root-soil interface in pollution ecology.