关键词: 硒, 克山病, 大骨节病, 生物地球化学, 景观

Abstract: In the Northeast and Southwest end of low selenium belt in China, two typical land-scapes are studied, that is: the landscape of the coniferous and broadleaf mixed forest in tem- perate zone and landscape of pines yunnanensis forest. other two landscapes as a control are also researched, they are landscapes of broadleaf forest in warm temperate zone and pines massoniana forest in subtropical zone, the former is in the region with out keshan and kachin-Back disease within low selenium belt and the latter is in the Southeastern non-disease belt of China. Results clearly show that the main rlant selenium contents in the typical landscapes are remarkably lower than that in control Landscapes; the soils have a similar tendency, Se levels in soils under the typical landscapes of low selenium belt are lower than that under the control ones. Therefore, the scientific inference of objective existence of low selenium belt in China was further supplemented from aspect of natural plants.

Key words: Selenium, Keshan disease, Kaschin-Beck disease, Biogeochemistry, Land-scape