摘要
通过重庆表层土壤网格化及岩土剖面取样测量,对重庆表层土壤Se的地球化学特征及丰缺进行研究。结果表明,重庆浅层土壤Se含量范围为（0.005～5.790）×10-6,背景值为0.197×10-6。土壤Se含量分布受地层、母岩岩性、土壤类型、土壤层位及土壤对Se富集特性的控制。高Se土壤主要分布在三叠系、二叠系、志留系、奥陶系及寒武系的石灰土中。以土壤Se含量（0.400~3.000）×10-6为富硒土标准,已调查发现重庆分布富硒土3 684 km2,在綦江南部—万盛—南川一带,在主城区周边天俯、花溪、三汇等小面积分布,推测在武隆—酉阳—秀山及城口—巫山一带存在大面积富硒土,重庆可能拥有上万平方千米富硒土。富硒土区pH环境、有机质含量有利于农产品安全,已发现北碚天府富硒土区谷物类及十字花科类农产品为富硒无公害或富硒绿色农产品。重庆富硒土具良好经济意义。
Geochemical characteristics and content of selenium （Se） in the topsoil of Chonqing City were investigated on the basis of measuring the topsoil in Chongqing obtained from gridding and section sampling. The content of Se in the topsoils of Chonqing City is （0.005~5.790）＆#215;10-6 , and the background level is 0.197＆#215;10-6 . The distribution of Se is controlled by the strata, the lithology of the mother rock, the types of the soil, the horizon of the soil and the controlling capability of the soil for enriching the Se. The Se-rich soil is distributed mainly in the Triassic, Permian, Devonian, Silurian, Ordovician and Cambrian calcareous soil. According to the standard that the Se-rich soil should have the Se content of （0.4~3.0）＆#215;10-6 , a total area of 3 684 km2 of Se-rich soil was discovered, which is distributed mainly in the south of Qiqiang-Wansheng-Nanchuan district, with a small amount distributed in places near the Chongqing main city, like Tianfu, Huaxi and Sanhui. It is inferred that there also exists over 10 000 km2 of Se-rich soil in Wulong-Youyang-Xius-han and Chengkou-Wushan areas. The Se-rich soil is favorable for enriching the Se in the primary product, because of the pH and the organic matter in the Se-rich environment. It has been proved that the primary products are green primary products in Beibei Se-rich soil area. The Se-rich soil in Chongqing has good economic significance.
出处
《物探与化探》
CAS
CSCD
2014年第2期325-330,共6页
Geophysical and Geochemical Exploration
基金
多目标区域生态地球化学调查(基[2003]003-18
基[2005]GZTR001-01
基[2007]GZTR001-08
基[2008]GZTR01-11)
关键词
重庆
富硒土
经济意义
土壤地球化学
Chongqing
Se-rich topsoil
economic significance
soil geochemistry
