京津冀平原区土壤环境质量和土地资源分布特征

Soil Environmental Quality of and Land Resources Distribution Characteristics in Beijing-Tianjin-Hebei Plain

以京津冀平原区多目标区域地球化学调查数据为基础,研究土壤中As、Pb、Cd、Hg、Cu、Cr、Zn和Ni等8个重金属元素的含量特征,对土壤环境质量进行综合评价。评价结果表明京津冀平原区土壤环境质量整体优良,部分地区土壤为轻度、中度和重度污染,主要分布在北京中心城区、天津城区和蓟县、河北省石家庄市、保定市、唐山市和秦皇岛市等地区,该成果为京津冀协同发展生态优先保护方面提供了土壤环境质量状况依据,对重度污染土地要进行严格管控,做到京津冀协同治污。结合土壤中硒和钾的含量特征,以硒含量大于0.3mg/kg和全钾含量大于2.5%圈定了富硒和富钾土地资源区,主要分布在京津冀平原东北和冀西南地区,该成果可为京津冀现代农业协同发展提供依据。

On the basis of the data obtained from multi-purpose regional geochemical survey in Beijing-Tianjin-Hebei plain, the content characteristics of heavy metals of As, Pb, Cd, Hg, Cu, Cr, Zn, Ni in soils were analyzed, and the comprehensive evaluation of soil environmental quality was done. The evaluation results show that the overall quality of most soils is proved to be pretty well. The polluted areas of heavy metal elements distribute in city center and suburb region of Beijing-Tianjin- Hebei. The results for collaborative development of Beijing-Tianjin-Hebei in ecological priority protection provide a basis of soil environmental quality; the polluted land should be strictly controlled, so that Beijing-Tianjin-Hebei should coordinate to develop. According to the selenium content（〉0.3mg/kg） and the potassium content（〉2.5%）, the selenium-rich and potassium-rich land resources can be divided, which mainly distributed in northeast of Beijing-Tianjin-Hebei plain and southwest of Hebei plain. The results can provide guides for Beijing-Tianjin-Heibei Modern Agricultural Collaborated Development.