The Influence of Lead Zinc Ore Powder on the Growth of Chinese Fir in Linxiang County,Hunan Province

By studying the elements content of the soil and Chinese fir in the surrounding area of lead and zinc ore powder dam in Taolin lead ore Linxiang County,Hunan Province,it showed that lead and zinc accumulated in the soil surface(0～10 cm),and had higher concentration in polluted area. In contrast with the normal area,lead and zinc concentration in soil and plant increased and Mg concentration decreased. With the increase of distance to the dam,Pb,Zn concentration in Chinese fir leaves and the weight of 100 leaves decreased,while the one year branch growth increased. The hight growth,the diameter growth and the volume of the Chinese fir in polluted area is lower than those of the Chinese fir in normal area.