【摘要】 中山湿性常绿阔叶林是我国山地常绿阔叶林中一个重要而特殊的类型。云南哀牢山原生中生湿性常绿阔叶林的小凋落物量（叶、直径＜ ２．５ ｃｍ 枝、花果和杂物）为（６．７７±１．４３）ｔ／（ｈｍ ２·ａ），大枯枝（直径≥２．５ ｃｍ ）凋落量为（０．４５±０．１８） ｔ／（ｈｍ ２·ａ），凋落高峰发生在干季末期４～５ 月和初冬时１０～１１ 月。由倒木、枯立木和大枯枝等组成的粗死木质物在该类森林中的现存量达９８．４６ ｔ／ｈｍ ２，其中倒木占其总量的８５．８％ ，且它们在林内分布不均匀，增加了森林生态系统结构和生境的多样性。粗死木质物是森林中重要的养分库，其中的Ｃ、Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ、Ｍｎ、Ａｌ和Ｆｅ元素的总贮量达到４８６９９ ｔ／ｈｍ ２，每年通过凋落物方式积累于林地表的养分元素只占其总量的７．７７％更多还原

【Abstract】 The composition and amount of the litterfall and coarse woody debris (CWD), their time and space distribution and the element return were studied in mid mountain humid evergreen broad leaved forest in Ailao Mountain in Yunnan, China. The average litterfall (leaves, wood (< 2 5 cm diameter), flower, fruit and mixed matter) was (6 77± 1 43) t/(hm 2·a) while the large wood litterfall (≥ 2 5 cm diameter) was (0 45±0 18) t/(hm 2·a). There were two marked peaks of annual litterfall, the main one from April to May and the second one from October to November. The standing crop of CWD in the forest was 98 46 t/hm 2, in which logs made up to 85 8% of the total. As the CWD was not well distributed in the forest, it increased the diversities of structure and site in the forest ecosystem. The total storage of C, N, P, K, Ca, Mg, Mn, Al and Fe in the CWD was 48699 t/hm 2, but return of elements to the forest ground in the litterfall only made up 7 77% of the nutrient storage of the CWD.更多还原