中文摘要：

2003年5月-2004年9月在长白山自然保护区北坡4个森林类型阔叶红松林、红松云冷杉林、岳桦云冷杉林和岳桦林内，利用凋落物原位减少法对4种森林类型的凋落物分解动态进行了研究。结果表明，凋落物现存量最大的为红松云冷杉林，依次为阔叶红松林、岳桦云冷杉林、岳桦林；凋落物分解速率与时间均呈指数关系，凋落物年分解常数为0．25—0．47，分解95％所需时间为18～39年，其中阔叶红松林凋落物年分解常数最大，依次为岳桦林、红松云冷杉林、岳桦云冷杉林。同一类型森林中，不同植物组分的年分解系数不同，一般是阔叶最大，针叶最小。

英文摘要：

By the method of in situ litterfall lessening, the litterfall decomposition in four forest types （ broadleaf-Korean pine forest, Korean pine and spruce-fir mixed forest, Betula ermanii and spruce-fir mixed forest, and B. ermanii forest） on the north slope of Changbai Mountains Nature Reserve was studied from May 2003 to September 2004. The results showed that Korean pine and spruce-fir mixed forest had the largest quantity of standing litterfall, followed by broadleaf-Korean pine forest, B. ermanii and spruce-fir mixed forest, and B. ermanii forest. There existed an exleaf-Korean pine forest, followed by in B. ermanii forest, Korean pine and spruce-fir mixed forest, and B. ermanii and spruce-fir mixed forest, and the time for decomposing 95% of the litterfall took about 18 to 39 years. In the same forest types, the annual decomposition rate of different plant components differed obviously, generally with broad leaf being the largest and conifer being the least.