植物根孔在土壤生态系统中的功能

Functions of root channels in the soil system

综合论述了植物根孔的概念 ,在土壤中的形成、分布以及生态功能。指出植物根孔是土壤大孔隙研究中的重要部分 ,是一个由植物根系、土壤、土壤微生物、水、空气等组成的“多介质界面”,众多的土壤生物过程在此发生 ,它在土壤水分、溶质传输以及环境污染物的迁移和转化等过程中具有重要意义。特别是在湿地生态系统中 ,发达的地下根孔系统为利用人工湿地系统净化污水、处理污泥等工程提供良好的污染物吸附转化界面以及“微生物消化池”。由于其界定的困难和研究方法的限制使得植物根孔的研究相对较少。深入研究植物根孔在土壤中的形成和功能对拓展和完善土壤大孔隙以及优先水流的研究具有深远的意义 。

The structure, distribution and functions of root channels in the soil system were reviewed. Root channel is one important component of macropores in the soil system. It is a multimedia interface, which involved with plant root, soil, microbe, water and air. It plays an important role in soil preferential flow, solute transportation, pollutant absorption and transform. In natural and constructed wetlands, the developed root channel system in the soil constructed a pollutant transport channel, absorption interface, and micro digestion pool, It can improve the efficiency of these sewage treatment projects. Unfortunately, root channels were not well researched because of the difficulties of methodology and define.