基于GIS的天津滨海新区土壤盐渍化空间分布研究(英文)

通过野外采样调查和GIS技术相结合,对天津滨海新区进行土壤盐渍化分布调查。结果表明,滨海新区土壤全盐平均含量为0.818%,土壤pH值平均值为8.43,土壤Cl-和Na+的平均含量接近,分别为0.27%和0.22%;从滨海新区土壤全盐空间分布上来看,从西部到东部沿海基本呈条带状分布,土壤全盐含量逐渐升高。对不同盐渍化程度土壤的分布面积进行了统计,非盐渍化土壤分布面积很少,仅占土地总面积的3.18%,轻度盐渍化土壤分布面积为 107.43 km2,占土地总面积的 6.34%,中度盐渍化土壤分布面积 173.51 km2,占土地总面积的 10.24%,重度盐渍化土壤分布面积为 217.36 km2,占土地总面积的 12.82%。盐土面积为 1 142.8 km2,占滨海新区陆地总面积的 67.42%,其中全盐含量为 0.6%~1.0%、1.0%~1.5%、>1.5%的分布面积分别为388.47、411.82、342.51 km2,分别占总面积的22.92%、24.3%、20.21%。

Spatial Distribution of Soil Salinization Based on GIS in Tianjin Binhai New Area

The distribution of soil salinization was investigated based on GIS and field sampling in Tianjin Binhai New Area.The results showed that the average soil total salt content was 0.818%,with an average pH of 8.43,and the average Cl-and Na+ contents were 0.27% and 0.22%,respectively.Presenting zonal distribution feature,the soil total salt content increased gradually from west to east of Binhai New Area.Statistics on the distribution areas of different salinization degrees showed that the area of non-salinzed soils only accounted for 3.18% of the total area;with an area of 107.43 km2,mild saline soil accounted for 6.34% of the total area;the area of moderate saline soil was 173.51 km2,accounting for 10.24%;and the area of salinzed soils was 217.36 km2,accounting for 12.82% of the total soil area.The area of saline soils(total salt content >0.6%) was 1 142.8 km2,accounting 67.42% of the total land area in Binhai New Area.And the areas for the soils with total salt content of 0.6%-1.0%,1.0%-1.5%,>1.5% were respectively 388.47,411.82,342.51 km2,accounting for 22.92%,24.3%,20.21% of the total area.