关键词: 土地质量, 地球化学评估, 等级, 坝上地区, 尚义县, 河北

Abstract:

The land quality in Bashang plateau of Shangyi County, Hebei Province is evaluated on geochemistry using land quality geochemical assessment model which is built using the analytic hierarchy process and membership functions．The results indicate that the land quality of assessment area is in good condition. The soil of the first quality grade is rich in nutrient elements and health indicators which accounts for 22.65% in the whole region，the proportion of second quality grade area is 40.65%，the proportion of third quality grade area with high of F^- and Cl^- is 6.80%, which has serious soda saline land. The irrigation water of the first and second quality grade accounts for 64.30% and 35.70%. The main influencing factors of irrigate water division are F^- and Cl^-, the over standard proportion of which are 5.70% and 34.30%. The 21 and 11 in geochemical assessment class and grade have a larger proportion, which accounts for 40.65% and 22.65%, relatively, the 32 and 31 with lower rate accounts for 1.60% and 6.80%.

Key words: land quality, geochemical evaluation, classification, Bashang plateau, Shangyi County, Hebei