贡嘎山峨眉冷杉原始林及其更新群落凋落物的特征

The characteristic of litterfall in the primeval and regenerated Abies fabri forests in Gongga Mountain

:1998～ 2 0 0 1年对贡嘎山峨眉冷杉〔Abiesfabri(Mast.)Craib〕原始林及其更新林凋落物的数量、凋落特征进行了观测和分析。结果显示 ,峨眉冷杉原始林的年均凋落量为 2 .777t/ (hm2 ·a) ,其中枯叶、枯枝、杂物平均分别占70 62 %、18 76%和 10 5 7% ;更新林的年均凋落量为 2 65 2t/ (hm2 ·a) ,其中枯叶、枯枝、杂物平均分别占 85 10 %、4 99%和 6 0 9%。凋落节律均为“双峰”型。

A three\|year study on the amount and characteristic of the litterfall of the primeval and regenerated Abies fabri (Mast.) Craib forests in Gongga Mountain was made. The results showed that the average annual amount of litterfall of the primeval Abies fabri forest and its regenerated forest was 2.777 t/(hm\+\{2\}·a) and 2.652 t/(hm\+\{2\}·a),\ respectively;\ 70.62% and85.10% of it was distributed inwithered leaves respectively, 18.76% and 4.99% of it in withered twigs respectively and 10.57% and 6.09% of it in the other miscellany respectively. There were two litterfall peaks annually in two kinds of forests. The characteristic of their litterfalls reflected the ecological and biological properties of the forests, and they also reflected adaptation of the forests to alpine environment.