Abstract: Determinations of Zn,Fe,Ca,Cu,Mg,Al,Se,Mn,Cr and Pb contents in the hairs of 136 children aged 0～13 and of 22 adults in the Qinba Mountains showed that the contents of test trace elements except Mg were abnormal in different degrees.The Al,Mn and Cr contents were highly excessive,their mean values being 2.04,1.67 and 2.07 times as the highest value of normal range,and the people excessive in three elements occupied 83.54%,77.85% and 72.78%,respectively.On the other hand,Zn and Se contents were in shortage,with the mean values being only 91.96%and 68.33% of the lowest value of normal range,and the people deficient in Zn and Se occupied 69.62% and 79.11%,respectively.Based on the local environmental geochemistry,this paper analyzed the possible causes of this abnormal status in trace elements and its harm.

Key words: SOM dynamics, SOM model, Diffusion motion, Translation motion, Terrestrial ecosystem