陕西地区土壤中的硒
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SELENIUM IN SOILS OF SHAANXI PROVINCE
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    摘要:

    硒是人和动物体必需的微量元素之一,早已证明,土壤和饲草中过量的硒会导致牲畜中毒而罹患“碱质病”和“盲跚症”,而土壤和饲草硒含量过低则会引起牲畜白肌病等多种缺硒病[9]。近年来国外又有资料报道食物和饮水中的低硒容易使人体产生癌症、心血管病、关节炎、婴幼儿碎死症等多种疾病[6]。鉴于在土壤一植物一动物和人的生态系统中,土壤是最基本的因素,因此对土壤硒的研究在许多国家早已受到人们的重视。国内对土壤硒的研究,始于七十年代对人体地方性疾病的研究,现已证实,地方性克山病、大骨节病的发生与环境和机体缺乏硒有密切关系[1,3,11]

    Abstract:

    Selenium is one of essential trace elements for human and animal.In order to study some endemic diseases in relation to environmental selenium,the distribution of Se in soils of Shaanzi Province was investigated.The quaternary loess and granite with low-Se content are predominant in parent materials of the soils in Shaangi.The average total Se content of soils developed on these parent materials is 0.118 ppm,and the average content of water-soluble Se is 1.9 ppb.Most of them belong to the.soils defecient in Se.Seleniferous rocks and soils are only distributed in limited areas of the eaatern Bashan Mountains of Southern Shaangi.According to the geographical distribution of Se in soils of Shaangi Province,five regions are divided as follows:(1) the region of very low content of Se,including Maowusu desert region and Loess Plateau in Northern Shaangi;(2) the region of lower content of Se,including Guanzhong Plain and "Sanbian" closed flow depression;(3) the region of medium content of Se,including Hanzhong-Ankang Basin;(4) the region of variable content of Se,including Qinling and Bashan Mountains;(5) the region of medium-high content of Se,including the eastern Bashan Mountain.The Se content of topsoil is the highest,and it decreases with the increasing of depth gradually in soil profile.There is a better correlation of exponential function between the percentage of water-soluble Se and soil pH,the regression equation is y=0.027e0.53x,r=0.763.The content of soil water-soluble Se is dependent on the total Se content,organic matter content and pH of soil.The regression equation of three variables is as follows:y=-7.148+0.014x1+0.128x2+0.93x3,r=0.785.Among the three factors mentioned above,the total Se and pH are the primary and the organic matter is the secondary.

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陈代中,任尚学,李继云.陕西地区土壤中的硒[J].土壤学报,1984,21(3):247-257. Chen Daizhong, Ren Shangxue, Li Jiyun. SELENIUM IN SOILS OF SHAANXI PROVINCE[J]. Acta Pedologica Sinica,1984,21(3):247-257.

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  • 在线发布日期: 2013-02-25
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