Abstract:

Set pair analysis is a new method applied to uncertain problems after 1990s.Relational degree has obvious dialectics and integrity in this theory.Soil environmental quality is affected by several factors,and has an uncertainty characteristic.Using the method of single pollution index and set pair analysis,a simple and useful assessment method to measure soil environmental quality was found in this paper .Results indicated that the pollution of Cd is the most serious,about eight plots were slightly polluted by Cd.Cd pollution is mostly caused by superphosphate use,gas combustion and tyre abrasion,et al.The pollution of elements followed by the order Cd＞As＞Cu＞Zn＞DDT＞Hg＞Cr＞Pb＞HCH.DDT was the main pollutant of organic pesticides with the value reaching 019 mg/kg.There were about 1255% of the study farmland being at the state of slight pollution,and 8745% of the farmland were safe.The comprehensive assessment showed that the soil environmental quality of farmland in Jianghan Plain is generally at the safe level for developing modern agriculture.The set pair analysis method has provided a new approach and typical example for soil environmental quality evaluation for farmland.

Key words: farmland, soil environmental quality, set pair analysis method