天津市土壤盐渍化现状与敏感性评价

依据蒸发量/降水量、地下水矿化度和地形等评价因子,采用地理信息系统技术对天津市的土壤进行了盐渍化敏感性评价。盐渍化单因子敏感性和综合敏感性的空间分布分析结果表明,天津土壤盐渍化以中度敏感区为主,主要分布天津中部广大平原区,而高度敏感区及极敏感区则主要分布在滨海平原及大港区,不敏感区集中分布在北部蓟县山区。

GIS-based Assessment on Sensitivity to Soil Salinization in Tianjin

Soil salinization has become one of the five soil problems that confused human beings.The current data from FAO proved that all kinds of saline soils occupy 10% of the whole earth surface,distribute almost all the continents,different climate belt and elevation belt.Tianjin land is located in the place of sea regression,which is the main reason that 65.6% of the Tianjin soil is affected by salinization differently.Our study is to find the different sensitivity of different location.According to three influencing factors,aridity index,mineral degree in groundwater and terrain,based on GIS,the single factor attribute database is established using the known criterion,and the sensitivity of three single factors are assessed.Through special overlay analysis of the three single factor sensitivity,the general sensitivity to soil salinization and the spatial heterogeneity in Tianjin are assessed.The results show that most part of Tianjin area is mid-sensitive land,which constitutes the expansive plain area in middle Tianjin,coastal area and Dagang district are the high and super sensitive region,north of Ji county belongs to non-sensitive region.