Abstract: The analyses on the microbial quantity and enzyme activity in the Malanzhuang iron tailings in Qian’an City of Hebei Province under effects of different vegetation restoration patterns showed that there were significant differences in the quantities of major microbes in the tailings, with the most for bacteria, followed by actinomyces, and fungi. The microbial quantity and the enzyme activity in 0-20 cm layer of the tailings decreased in the orderof plantation>natural restoration>new tailing. Both the microbial quantity and the enzyme activity decreased significantly with increasing sampling depth. There were positive relationships between the microbial quantity and the enzyme activity in the tailings, but the correlation degree was different. It was concluded that both the natural restoration and the plantation could improve the microbial quantity and enzyme activity in iron tailings, and the effect of plantation was more significant.

Key words: Evapotranspiration, Penman-Monteith equation, Crop coefficient, Rice