Abstract:

The law of stump sprouting of broad-leaved tree species was studied in eastern forest area in Northeast China by the investigation of fixed sampling. The results revealed that the annual number of stump sprout of tree species was related to the diameter of stump obviously, it increased as the increase of stump diameter, then it decreased as the stump diameter increasing too large. According to the analysis on the relation between the number of stump sprout and the height of stump, the broad-leaved tree species in the study site were divided into three types of stump sprouting: the logarithmic increasing pattern, linear increasing pattern and exponential increasing pattern. The annual height growth of stump sprout was not related to the diameter and height of stump, but it was different in each tree species. Furthermore, the relationship between the number of stump sprout and the stump diameter in the second year was the same as that in the first year, and there were some stumps which could grow a few of new sprouts. The difference between the annual stump sprouting and biennial one was that certain number of sprouts were dead in the second year, and the number of dead sprout increased as the sprout number increasing of each stump. On the other hand, the rate of the stump with living sprouts was different in each tree species, the survival rate of Fraxinus mandshurica was 96.2%, Phellodendron amurense and Juglans mandshulica about 70%, maple(Acer spp.) 23.3%, and elm(Ulmus spp.) 21.8%. The investigation of selected-cut forest stand before 1990 proved that some stump sprouts of each tree species mentioned above could develop into big tree instead of the cut and fallen trunk.

Key words: northeast forest area, broad-leaved tree, stump, sprout, dynamics