【摘要】 <正> 森林是陆地生态系统中的一个重要组成部分,在一定程度上可以说它是“历史的见证”,因为在森林中记录了过去生态环境的一些变化和特点。 树木年轮是过去环境记录的一个重要各面,大家知道,通过观察树木年轮,可分析研究近千年来地球上气候的变化。这一方法在国内外已得到广泛的应用。但是从生物地球化学观更多还原

【Abstract】 In order to investigate the relationship between the attach of local disease and some trace elements from the biogeochemical point of view, we studied the trace elements in the tree ringsThe contents of 12 chemical elements, i.e., Mo, Cu, Si, Ba, Zn, Mg, Cr, B, Mn, Fe. P, Pb, in 51 rings of 4 trees of Populus davidiana, divided into 2 groups, were determined by emission spectrograph.The results of analysis show that the annual variations of some trace elements in the tree rings, which should closely connect with the water-soil conditions at that time in the locality, has appeared to have certain correlation with the growth and decline of keshan disease.更多还原