河北省典型蔬菜产区土壤养分和重金属累积特征及相关性研究

Characteristics and correlation of main soil nutrients and heavy metals accumulation in vegetable production areas of Hebei province

中文关键词:  土壤  养分  重金属  累积特征  相关性  河北

英文关键词:soil  nutrient  heavy metals  accumulation characteristics  correlation  Hebei province

中文摘要:

      目的 了解蔬菜产区土壤养分和重金属累积状况。方法 采用田间采样与室内分析相结合的方法, 以河北省5个典型蔬菜产区永年、藁城、定州、青县和玉田为研究对象, 研究土壤主要养分和重金属累积特征及相关性。结果 不同蔬菜产区土壤主要养分和重金属含量均存在明显的差异。参照HJ/T 333-2006《温室蔬菜产地环境质量评价标准》中土壤环境质量评价指标限值, 土壤Cd的点位超标率为6.60%, 其他元素均不超标。土壤中各重金属含量之间多呈正相关关系。土壤Pb和Hg含量与种植年限均呈正相关关系, 随着种植年限的增加, 土壤中Pb和Hg的含量明显增加, 达到极显著水平(P＜0.01)。为菜田土壤环境安全考虑, 土壤有机质、全氮、全磷和有效磷的环境安全阈值分别确定为30.86、1.99、2.89、0.248 g/kg。结论 通过对河北省典型蔬菜产区土壤各项土壤养分指标与土壤重金属镉含量间的关系建立数学模型, 可以预测土壤主要养分的环境安全阈值。

英文摘要:

      Objective To understand the status of soil nutrients and heavy metals accumulation in vegetable production areas. Methods The study was conducted in 5 counties, including Yongnian, Gaocheng, Dingzhou, Qingxian and Yutian, which located in the typical vegetable production areas in Hebei province. By field investigation and laboratory analysis, accumulation characteristics and correlation analysis of soil nutrients and heavy metals in 5 typical vegetable production areas of Hebei province were investigated. Results There were significant differences in soil nutrients and heavy metal contents in different vegetable production areas. According to HJ/T333-2006 The evaluation criteria for soil environmental quality of greenhouse vegetable production areas, the ratio of soil Cd exceeded the standard was 6.60%, and other elements did not exceed the standard. There were positive correlations among the soil heavy metals content. Soil Pb and Hg content were positively correlated with the planting years. With the increasing of planting years, soil Pb and Hg content increased significantly (P<0.01). The environmental safety thresholds of soil organic matter, total nitrogen, total phosphorus and available phosphorus were defined as 30.86, 1.99, 2.89 and 0.248 g/kg, respectively. Conclusion The relationship between soil nutrient indexes and soil heavy metals can be simulated by mathematic models in typical vegetable production areas of Hebei province, and the environmental safety thresholds of soil nutrient indexes can be forecasted.