Evaluation of soil quality in suburb of Beijing under field scale

In this study, typical three fields in the suburb of Beijing were selected as research object, including T1 bordering on a hill, T2 close to Beijing-Chengde highway, and T3 locating in the vicinity of the village with intensive human activities,. In order to evaluate soil quality in these areas and explore the impact of surrounding environment on soil quality, the soil fertility quality was quantitatively assessed by Fuzzy membership function model with basic evaluation indices which are organic matter, pH value, available phosphors, instant potassium and ammonium nitrogen. The soil environment quality was assessed by single factor pollution index and Nemerow indices of heavy metal including copper, zinc, chromium, plumbum, cadmium, arsenic, mercury. The results showed that comprehensive index of soil fertility quality in T1, T2 and T3 were 0.494, 0.624 and 0.630, respectively, and Nemerow indices were 0.876, 0.972 and 0.903, respectively, all belonging to Ⅱ grade of soil environment quality. In these three fields, T2 had potential risk of heavy metal pollution. The comprehensive assessment indicated that the studied fields had good soil fertility quality and environment quality which were quite clean and safe to be agricultural base for agricultural products. The soil fertility quality in T1 field was relatively poor under the effect of hill. T2 field showed the worst environmental quality. The village of intensive human activities had no impact on soil quality of T3.