西藏土壤中汞的含量及其地理分布

分析了采自西藏地区２０５个样品的土壤含汞量，并用数理统计方法和微机进行了数据的存入和有关计算。研究结果表明，西藏土壤汞的含量为０．０２１ｍｇ／ｋｇ，明显低于全国０．０４０ｍｇ／ｋｇ平均水平，西藏土壤中汞的含量呈由东（南）－西（北）逐渐降低的总趋势，这与西藏植被和土壤地带性的演替变化方向一致。亚东地区土壤垂直带谱中土壤汞的含量随海拔高度的升高而下降。汞的含量与土壤的基本属性密切相关，有着向土壤有机质

Levels of Mercury in Soil and Their Geographical Distribution in Tibet

Samples of soil were taken from different sites in Tibet and analysed for their levels of mercury in soil.The data obtained were processed by using a method for mathematical programming statistics on amicrocomputer and making some related computations.The results show that the average level of mercury in soils from Tibet was 0.021mg/kg and significantly lower than the average nationallevel of 0.04 mg/kg.The level of mercury in soilwas distributed in Tibet with a total trend ofgradually decreasing from the southeast to the northwest that was consistent with the direction ofchanges in the zonal successions of vegetation andsoil in Tibet.The level of mercury was closelyrelated to the basic attributes of soil and mercurytends to be concentrated upto the organic matter andglutinous grains of soil.