Characteristics and genetic analysis of selenium-rich soil in Changshan County, western Zhejiang Province
Dao-Rong LIU1, Hong XU2, Yi ZHOU1, Jian-Guo HOU1, Yuan-Qing SONG1, Yong-Rong WENG1
1. Zhejiang Geological Prospecting Institute of China Chemical Geology and Mine Bureau, Hangzhou 310002, China 2. Bureau of Land and Resources of Changshan County, Changshan 324200, China
Through the investigation and study of surface soil in Changshan County, western Zhejiang Province, a large area of selenium-rich soil was found, and the distribution characteristics of selenium were summarized. The mean amount of selenium in the surface soil in the study area is 0.44×10 -6, and different soil types obviously have different amounts of selenium. The amount of soil selenium of the lime (rock) soil is the highest, with the average value being 0.58×10 -6, and different parent materials obviously have different amounts of selenium. The amount of soil selenium content in Holocene flood alluvium is the highest, with the average value being 0.59×10 -6. The probability accumulation curve shows that the exogenous input components in Changshan have little effect on soil selenium. The amount of soil selenium is closely related to the values of V, Mo, Ni, Cr, S,Cu and Cd (P<0.01), and is also closely related to organic matter (r=0.35), with no significant correlation with soil pH. The selenium values of marlstone in Xiyangshan Formation, carbonaceous shale and siliceous rock in Hetang Formation and carbonaceous shale in Ningguo Formation are relatively high. Selenium in soil inherits selenium in rocks. The wide distribution of selenium-rich rocks is the important reason for the formation of selenium-rich soils.
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