我国低硒带典型景观植物硒的研究

本研究在我国低硒带的东北端和西南端分别选取了针阔叶混交林景观和云南松林景观,并且在低硒带内的克山病和大骨节病非病区与东南非病带选取了落叶阔叶林景观和马尾松林景观为对照景观,系统地采集了上述各不同景观的主要植物和土壤,对硒进行了分析。结果发现,在我国低硒带的东北瑞和西南瑞景观的主要植物含硒量显著地低于对照景观,同时景观内土壤硒也明显地低于划分我国低硒生态景观的阈值,从天然植物的角度进一步对我国低硒带客观存在这一科学论断进行了补充。

RESEARCH OF PLANTS OF TYPICAL LANDSCAPES OF LOWSELENIUM BELT IN CHINA

In the Northeast and Southwest and of low selenium belt in China, two typical landscapes are studied, that is: the landscape of the coniferous and broadleaf mixed forest in temperate zone and landscape of pinus yunnanensis forest, other two landscapes as a control are also researched, they are landscapes of broadleaf forest in warm temperate zone and pinus 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 plant 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-