Chemical Contamination and Cleanup Standard Setting of Herbicides in Phaiozem of Northeastern China

Qixing Zhou, Ph.D., Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P. R. China,  Tel: +86-24-23997170, Fax: +86-24-23843313, E-mail: Zhouq@mail.sy.ln.cn or Zhouqixing@hotmail.com

The phaiozem area is the important base of commercial provisions in China. However, there is a large-scale application of herbicides in the area in order to increase the yield of crops and the productivity of lands in the past decades. It has paid attention to the ecological safety of agricultural soils and the safe quality of crops with the entry of the country into the World Trade Organization. Thus, the current situation of herbicide contamination in phaiozem was systemically investigated. Purification and detoxic function of herbicides in phaiozem was also evaluated on the basis of its eco-toxicological characteristics. It was indicated by the two aspects that contamination of herbicides in phaiozem is now one of the dangerous threats to the quality and health of the soils. The enactment of cleanup standards of herbicides in phaiozem is obviously a matter of great urgency in order to control and remedy contamination of herbicide in the soil. Under the condition of the soil contamination, cleanup standard setting of herbicides in phaiozem was theoretically discussed at four angles: the decision tree of soil-chemical behavior of herbicides, the decision tree of groundwater contamination by hericides, the decision tree of soil enzymes and relevant molecular mechanisms, and the decision tree of ecological effects of herbicides on honeybee, earthworm and sensitive organisms.

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