赣江流域土地利用结构及社会经济对河流可溶性重金属含量的影响

发布时间：2018-05-29 19:43

本文选题：可溶性重金属 + 多尺度　；参考：《环境科学学报》2017年07期

【摘要】：基于以2014年Landsat 8卫星影像以及2014年1月和6月野外采样数据并结合GIS技术与统计方法,分析赣江流域土地利用格局与河流水体可溶性重金属分布的关系.结果表明:赣江流域土地利用类型与可溶性重金属含量具有显著相关性,其中城镇建设用地与赣江可溶性重金属含量关系最为密切.林地与草地的面积比例与可溶性重金属呈现显著的负相关,但这种负相关仅存在于河流下游的较低坡度区域.整个子流域、河流缓冲区及坡度3个尺度上土地利用结构与河流可溶性重金属含量的关系,具有很大的差异,不同坡度大小上土地利用结构能较好地反映人类活动强度.低坡度区域由于人类活动强度较大,因此低坡度区域内土地利用结构对河流可溶性重金属含量具有更大的影响.社会经济要素和河流可溶性重金属含量的关系密切,工农业活动的强弱与赣江可溶性重金属含量的高低存在明显的对应关系.赣江流域土地利用结构与河流可溶性重金属含量间的关系存在季节的差异,总体上,丰水期与土地利用结构关系更显著.
[Abstract]:Based on the Landsat 8 satellite images in 2014 and field sampling data in January and June 2014, combined with GIS techniques and statistical methods, the relationship between land use patterns and the distribution of soluble heavy metals in river bodies in Ganjiang River Basin was analyzed. The results showed that there was a significant correlation between land use types and soluble heavy metals content in Ganjiang River basin, and the relationship between urban construction land and the content of soluble heavy metals in Ganjiang River was the most close. There was a significant negative correlation between the area ratio of forestland and grassland and soluble heavy metals, but only in the lower slope area of the lower reaches of the river. The relationship between the land use structure and the content of soluble heavy metals in the river on the three scales of river buffer zone and slope is very different. The land use structure in different slope can reflect the intensity of human activity. Because of the high intensity of human activities, the land use structure in the low slope area has a greater influence on the soluble heavy metal content in the river. The relationship between the social and economic factors and the soluble heavy metal content in rivers is close, and there is an obvious corresponding relationship between the industrial and agricultural activities and the content of soluble heavy metals in Ganjiang River. There are seasonal differences between land use structure and soluble heavy metal content in Ganjiang River basin. In general, the relationship between water abundance and land use structure is more significant.
【作者单位】：江西师范大学地理与环境学院;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室;
【基金】：国家自然科学基金项目(No.41361018,41401587) 鄱阳湖湿地与流域研究教育部重点实验室(江西师范大学)开放基金资助项目(No.PK2013002) 江西省教育厅科技计划项目(No.GJJ160276)~~
【分类号】：X522

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