Effects of root exudates in the bioremediation of contaminated soils

Abstract

Abstract: As one of the important components of microecosystem in rhizosphere,root exudates play an important role in the effective and enhanced bioremediation of contaminated soils through the combined interaction of soil,plant and microorganism.Root exudates can not only activate heavy metal pollutions to enhance their bioavailability in rhizosphere and plant uptake efficiency,but also provide abundant nutrition and energy to microorganism to increase the biomass and activity of microorganism,and thus promote the biodegradation of organic pollutions in soil environment.On the other hand,root exudates can immobilize and fix the heavy metals to reduce their environmental risk by chelating them.In addition,the enzymes that the root secreted can degrade organic pollutions directly.At last,some key points were suggested for further studies in this field.

Key words: Canopy gap, Edge of canopy gap, Thermal effect, Water vapor effect, Temporal spatial distribution

CLC Number:

S154.1

GAO Hongjian, JIANG Xin, CHANG Jiang, WANG Daichang, ZHAO Zhenhua, BIAN Yongrong. Effects of root exudates in the bioremediation of contaminated soils[J]. cje, 2004, (4): 135-139.

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