作者机构:[1]College of Life and Environmental Science, Harbin Normal University, Harbin 150080, China, [2]College of Forestry, Northeast Forestry University, Harbin 150040, China
相关基金:Sponsored by the National Natural Science Foundation of China (Grant No. 40271044 ) , Natural Science Foundation( Grant No. TK2005 - 17 ) and Project of Science Backbone of Heilongjiang Province( Grant No. 1151G021 ).