Evaluation of the Soil Environmental Quality in the Major Walnut Production Regions of Ganzi Tibetan Autonomous Prefecture

Eighteen soil samples were collected in six experiment areas including Luding,Kangding,Danba,Batang,Xiangcheng and Derong,which were the major walnut production regions of Ganzi Tibetan Autonomous Prefecture. Six indexes of heavy metals and two indexes of pesticide residues were determined by the relevant national standards, and were evaluated by green food soil environmental quality LY/T1678-2006. The results showed that heavy metals and pesticide residues contents met the requirement of green food soil environmental quality LY/T1678-2006. The soil environmental quality was good,which had the basic conditions for developing the walnut green food and pollution-free forest fruit products. This study would provide scientific evidence for guiding the production of walnut green food and economic forestry estate layout all over the prefecture.