摘要
通过两季原位观测,分析了重庆市城郊菜地土壤Pb的输入通量、输出通量及平衡量。结果表明,重庆城郊菜地土壤Pb的年输入、年输出通量分别为628.41 g/hm2、169.32 g/hm2,年积累量为459.09 g/hm2。大气干湿沉降是Pb输入的主要来源,其年输入量510.18 g/hm2,贡献率为81.19%;其次是化肥,贡献率为17.28%,而灌溉水、种子的贡献率极低。在Pb输出途径中,输出比例为地下渗流(54.70%)>地表径流(30.01%)>蔬菜残茬(8.03%)>蔬菜收获物(5.51%)>除草(1.75%)。
The situ observation of two consecutive quarters was conducted to determine the soil lead input flux,output flux,and balance amount in Chongqing suburb. The results showed that the Pb annual input and output flux were 628. 41 g / hm^2 and 169. 32 g / hm^2,respectively,and the annual accumulation was 459. 09 g / hm^2. Atmospheric dry deposition was the main source of Pb input,with the annual input of 510. 18 g / hm^2,and the contribution rate of 81. 19%; it was followed by chemical fertilizers,with the contribution rate of17. 28%,whereas the contribution rates of irrigation water and seed were very low. In the pathway of Pb output,the ratio was ordered as follows： the subsurface flow（ 54. 7%）〉 the surface runoff（ 30. 01%）〉 the vegetable residue（ 8. 03%）〉 the vegetable harvest（ 5. 51%） 〉the weeding（ 1. 75%）.
出处
《环境影响评价》
2016年第6期92-96,共5页
Environmental Impact Assessment
基金
重庆市科技攻关重点项目(CSTC2011AC101)
重庆市农业委员会2014年行业技术支撑项目
关键词
菜地土壤
铅
输入
输出
通量
vegetable-based soil
lead
input
output
flux
