我国青海高原环境低硒的状况及影响

Condition and Effect of Selenium Deficiency in Qinhai Plateau

选择分布于青海高原不同地区和不同地形条件下３６个县市的１１３个采样点，检测了一千余个各种土壤－植物－动物（人）样品的含硒量、表明青海缺硒和严重缺硒的地区占全省总面积的９４％．而不缺硒的地区仅占６％，同时还查明：（１）土壤含硒量与植物中的含硒量呈现明显的正相关（ｙ＝０．９４５），土壤－植物－动物（人）机体的含硒量分析都呈现相互关联的链条关系．（２）不同地形的土壤含硒量有较大的差异．一般河谷水浇地硒含量要高于山地．（３）生长在相同上囊中的植物．因其品种不同而呈现出聚硒能力的差异。（４）动物在缺硒条件下，体内人和组织硒水平迅速下降．（５）在相同缺硒地区生活的人群，由于膳食结构不同，摄入硒的多少也不同，因而导致体内含硒量的差异。大骨节病、心脏病及癌症病人的血硒含量明显低于当地正常人的水平．本研究将为协调环境与生物（包括人体健康）的关系和进一步研究硒元素在自然界中的生态循环规律提供基础。

Abstract The selenium content of more than 1000 samples of all kinds of soil.plants and animals(include human)was estimated.These samples were selected from 113 sites of 36 counties which distributed in different distriets and different terrains in Qinhai plateau.The results showed that the selenium-deficient and serious selenium-dificient areas were 94% of the total areas of Qinhai province.while only 6% were the Se-adequate areas.The results also indicated that:1.The Se content showed significant positive relations(γ=0. 945)between in soil and in plant.From the Se analysis of soil-plant-animal(include human).it showed a chaininterrelation of each other.2.In different terrains.the soil Se content was obviously different.generally.it was higher in river valley areas than in moutainous (areas).3. Due to the variety of plants.their ability to assemble selenium was different.although these plant grew in the same soil.4.In the conditions of Se deficiency.the Se level in animal's body and tissue quickly decreased.5.Due to the difference of diet construction,people in the same se-deficient area had different selenium intakes and the Se status was also different.The blood selenium level of Kaschin-beck patients.cardiovascular patients and cancer patients was significantly lower than that of normal people in this same area.To adjust the relationship between the enviroment and living things and do further research on the role of element selenium in biological cycle.this article would probably supply the basic data.