沈阳南部沿城乡梯度土壤铅时空分布研究

对沈阳南部沿城乡梯度土壤铅含量的分布特征进行了研究。结果表明,全量Pb沿城乡梯度显著降低,但不同土层之间无显著差异。有效态Pb含量沿城乡梯度具有显著降低,并且在城市土壤中呈现较明显的季节性变化。另外,土壤有效态Pb含量在夏季郊区样品和秋季城市样品的层次之间也有显著变化。相关性分析表明,土壤理化性质如土壤质地、pH和CEC对全量及有效态Pb含量产生了一定影响,而人为等因素是影响土壤全量及有效态重金属的主要因素。

Spatiotemporal Distribution of Soil Pb along an Urban-Rural Gradient in Southern Shenyang

Spatiotemporal distribution of soil Pb at the depths of 0~10, 10~20 and 20~30 cm was investigated along an urban-rural gradient in southern Shenyang. The total Pb content showed significant decreases along an urban-rural gradient, while no significant changes were found among different soil layers. The DTPA-extractable Pb exhibited significant changes between different sites, and significant changes were also observed in urban soils between different sampling times. Although soil texture, pH and CEC had some correlations with total and DTPA-extractable Pb content, human activities were the main factor to influence Pb content in soil ecosystems.