天津地区表层土壤PAHs多尺度空间分布特征

Multi-scale Spatial Distribution Characteristics of Topsoil PAHs in Tianjin Area

在空间尺度划分和区域化分量研究的基础上,进一步分析了天津地区表层土壤PAHs不同空间尺度上区域化分量的空间分布特征,并分析了形成分布特征的原因。结果表明,在块金尺度上,16种PAHs的区域化分量的空间分布都比较零散,表现出局部小块的形式;与块金尺度相比,虽然在小尺度上PAHs区域化分量的空间分布上还是存在着较大的差异性,但分布特征却存在着明显的规律性,空间递变规律较好;与块金尺度和小尺度空间相比,天津地区PAHs在大尺度空间上的区域化分量基本上均匀分布。在成因上,大气运移可能是决定土壤PAHs浓度空间递变方向和梯度的主要环境因素,河流是另外一个主要环境因素。

Based on the division of spatial scale and regionalized component analysis of topsoil PAHs in Tianjin area, the spatial distribution of regionalized components at different scales was studied in this paper. Results showed that the spatial distribution of the regionalized com- ponents of PAHs at the nugget scale were scattered. At the small scale, significant regional tendency could be identified, although spatial variation still existed for the regionalized components. In comparison, at the large scale, the regionalized components distributed evenly. The transportation of PAHs driven by atmosphere might be the key factor determining the spatial variation of PAHs in soils, river might be another important factor.