CAJ | 학술논문

The poplar increment with different cultivation mo dels and the microbiota and enzyme activity were studied based on 7-years' cont inuous observation at two stages (1992～1995 and 1996～2000). The poplar stand l ocated in Minquan County of Henan Province with an area of 3.12 hectares. The r esults showed that the annual average increment in the second stage of all model s was higher compared with that in the first stage in height and diameter breast -high(DBH). The model A and B of the second stage were the best with an inc rease of 135%, 175% and 214%, 250% higher than that of the first stage, while th e control was only 122% and 130%. The amount of three soil microbiota in the sec ond stage was higher than that in the first stage. The bacterium was the most am ong the three microbiota, and the fungus was the least. All the enzyme activitie s of five models in the second stage were higher than that in the first stage (e xcept D, E of catalase). The increase ranges from 3% to 161%. In model A and B, the phosphates and urease increased by 135%, 89% and 161%, 105% respectively.