| Forests in Greater Khingan Mountains is the most important ecological barrier in the north of China. It occupies an important position in the ecological balance. It is also the largest together with the highest latitude forest. But along with the increasing global warming, Greater Khingan Mountains area appeared the phenomenon which has a lot of death trees. Effect the ecological function and quality of the forest in the Greater Khingan Mountains. But the reason for the death of the tree species, geographic distribution and death situation has not yet been explained.So it needs to study the different forest types in Greater Khingan Mountains. This reasearch was designed to study and investigate of the dead trees species, diameter breast height(DBH) and other indexs in Saihanwula Ecological Station (Deciduous broad leaved forest); wuchagou forests farm(Coniferous and broad-leaved mixed forest) and Hanma conservation area (Coniferous forest). The study of the dead trees in Greater Khingan Mountains is helpful to establish forest ecological balance system, provide theoretical basis for the reasonable and effective management, and the problem solving of the forest ecosystem. The main results are as follows:(1) Saihanwula Ecological Station has the largest number of dead trees, Hanma conservation area ranked as the second, Wuchagou has the least number.(2) In Saihanwula Ecological Station aspen has the largest mortality. In wuchagou farm betula davurica has the largest mortality. In Hanma conservation area larch has the largest mortality.(3) The tree mortality rang of Saihanwula Ecological Station is 11.36%～30.78%, The tree mortality rang of In Wuchagou farm is 0.41%～12%, The tree mortality rang of Hanma conservation area is 2.08%-7.66%.(4) The size-class structure range of the dead trees in Saihanwula and wuchagou is distribution in 10-20cm. While the size-class structure range of the dead trees in Hanma conservation area is distribution in 0-10 cm. |
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