天津市郊区菜地土壤重金属通量的研究

目的]为了掌握天津市郊区菜地土壤中重金属元素的输入输出特征和变化规律,促进土地资源的可持续利用。方法]在2个调查区,配套采集大气干湿沉降、灌溉水、化肥、蔬菜样品,并且进行相关研究。结果]工矿企业较多的地区重金属大气干湿沉降输入通量大。土壤重金属富集程度高的地区蔬菜重金属输出通量更高。大气干湿沉降是天津市近郊土壤主要的重金属输入途径。天津市城郊菜地的4种重金属元素处于持续累积的过程中。结论]修复污染土壤、降低重金属大气干湿沉降通量是保障郊区菜地可持续利用的重要措施。

Heavy Metal Flux Research in Tianjin Suburb Vegetable Farmland

Objective] The research aimed to find out the characteristics of heavy metal input and output flux in Tianjin suburb vegetable farmland, which would help promoting the sustainable use of land resource. Method ] The research in 2 sites was carried out,where dry and wet atmospheric deposit, irrigation water, fertilizer and vegetable samples were collected. Result] The heavy metal input flux of dry and wet atmospheric deposit was higher in industry area. The heavy metal output flux of vegetable was higher, where the heavy metal was more accu- mulated in soil. Dry and wet atmospheric deposit was the main heavy metal input resource of Tianjin suburb soil. Four heavy metal elements concentration in Tianjin suburb vegetable farmland soil was constantly increasing. Conclusion] Remediation of contaminated soil and reduc- tion of heavy metal input flux of dry and wet atmospheric deposit were important solutions to guarantee the sustainable utilization of suburb veg- etable farmland.