关键词: 怀涿盆地, 土壤养分, 国光苹果, 重金属, 评价

Abstract: In order to understand the soil nutrition and environmental quality of the advantageous Ralls apple production area of Huaizhuo basin,soil nutrition and heavy metal element content in 9 large-scale Ralls apple orchards of Huaizhuo basin were detected and analyzed,and the environmental quality of soil was evaluated by methods of soil nutrient evaluation,single pollution index and comprehensive pollution index in 2015—2017.Moreover,some classification and evaluation were given on the soil nutrient level and environmental quality status.The results showed that,the average of organic matter content in the apple orchard soils of Huaizhuo basin was 37.25 g/kg,the averages of total N,available N,available P,available K contents were 1.62 g/kg,104.92 mg/kg,21.32 mg/kg,146.79 mg/kg,respectively,and the averages of available Ca,available Mg,available Fe,available Mn,available Cu,available Zn,available B contents were 1 191.35,308.86,6.03,11.12,0.87,1.35,1.13 mg/kg,respectively,so the nutrient content was at higher level.At the meantime,the contents of heavy metals were lower than the limited requirements by the national standards, so the soil environment quality was evaluated to a level of cleanliness. In summary,the soil quality level in Huaizhuo basin was suitable for the development of high quality Ralls apple.However,the contents of Cr,Hg and available Fe in some monitoring points were approaching early warning risk.It is recommended to regularly determine the soil environmental quality and develop soil remediation measures.

Key words: Huaizhuo basin, Soil nutrient, Ralls apple, Heavy metal, Evaluation