基于GIS的河北平原土壤Se年增长量估算

Se Annual Increment Estimated Data in Soils of the Hebei Plain Basd on GIS Technique

利用多类样品数据对河北平原Se元素的输入输出通量进行了空间分析,并在此基础上对土壤Se的年增长量进行了估算.结果显示:在河北平原,大气干湿沉降为土壤中Se主要输入方式,输入通量达到5. 88 g·(hm2·a)^-1,灌溉水和化肥输入通量较低,通过粮食籽实输出通量极小,研究区Se属于净输入的形势.河北平原Se净增量均值为3. 4μg·kg^-1.由于大气干湿沉降的分布较均匀,Se净增量的区域分布差异由灌溉水输入决定,整体上形成山前和滨海地区两个高净增量区域;除此之外,各地工业结构,以及土壤类型等也会影响了当地Se的净增量,如城市Se净增量高于农村,化工城市Se净增量高于其他城市,适宜农作物生长的土壤类型的Se净增量低于不适宜农作物生长的土壤类型.

The input/output fluxes and the annual growth of Se in Hebei plain are studied by using a variety of sample data with spatial analysis method. The results show that atmospheric deposition is the main input way of Se in soils,the input flux of that reaches 5. 88 g·( hm^2·a)^-1. The input flux of irrigation water and fertilizer is lower than that of atmospheric deposition,meanwhile the output flux through grain seeds is also very small,so Se is net input in Hebei Plain. The net increment of Se in soils is 3. 4 μg·kg^-1. Due to the minor due to differences distribution of atmospheric deposition,the regional distribution of the regional distribution of Se net increment is determined by the input of irrigation water,The pre-mountain area and coastal area of two high net incremental area are formed as a whole;and,besides that,the industrial structure and soil style also influence the net increment of Se in different areas. The net increment of urban Se is higher than that of rural area;the net increment of Se in chemical industrial cities are higher than that of other cities;and the net increment of Se in soil styles suitable for crop growth are lower than that unsutiable for crop growth.