硒(Se)是生态环境中重要的微量元素,其丰缺与人和动植物健康有着密切关系.选择黑龙江省松嫩平原南部,在多目标区域地球化学调查获取的Se元素数据基础上,采集大气干湿沉降、灌溉水、化肥等土壤硒输入端元,以及植物收割、下渗水等输出端元样品,计算土壤Se输入输出通量,研究土壤硒循环特征,并预测土壤Se未来发展趋势.结果发现:研究区总体上为土壤低Se区,Se不足和潜在Se不足面积占总面积的35.20％；土壤Se的主要输入途径为大气干湿沉降,可达总输入量的70％～ 90％,主要输出途径为土壤下渗水,约占总输出量的73％；研究区土壤Se为净积累状态,预测表明20年后土壤Se不足和潜在Se不足面积将从目前的35.20％下降到31.7％.%Selenium is an important trace element in the eco-environment in the aspect of the human, plant and animal health. In this paper, circling of the soil Se was studied by sampling the input endmembers of soil Se, such as atmospheric deposition, irrigation water and chemical fertilizer, as well as the output endmembers such as the harvested plant parts and soil seepage water, as the further study based on the multi-purpose geochemical survey ( MPGS). The input and output fluxes of the endmembers were calculated and the accumulation rate of soil Se was predicted. Three aspects were found as the following; in general, the study area has a low soil Se level with the area of soil Se deficiency and potential deficiency covering 35. 20% of the whole area; the maximum soil Se input comes from the wet and dry atmospheric deposition, and the maximum soil Se output end-member is the soil seepage water; soil Se in the study area shows a state of net accumulation, and the area of Se deficiency and potential deficiency will decrease from 35. 20% to 31. 7% in 20 years.
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