尖峰岭热带山地雨林群落呼吸量初步测定

Measurement for Respiration of Tropical Mountain Rain Forest in Jianfengling,Hainan Island

用密闭吸收法测定了海南岛尖峰岭热带山地雨林主要树种的树干、树枝、树叶、树根等组分的呼吸速率，根据ＰｉｐｅＭｏｄｅｌ理论，测出了主要树种木质器官的直径频度分布模型；树干、树枝及树根的呼吸速率与直径呈良好的幂函数关系；求出了单株林木呼吸总量与胸径之间的经验公式，计算森林群落（乔木层）月呼吸量［ｔ／（ｈｍ２·月）］：树干１．６９～１．７３、树枝０．７８～０．７９、树叶０．８１～０．８３、树根０．２４～０．２５，总计为３．５～３．６ｔ／（ｈｍ２·月），由此而推算年呼吸量约为４２．２～４３．１ｔ／（ｈｍ２·ａ），需消耗干物质约为２２．７～２３．２ｔ／（ｈｍ２·ａ）。

The respiration of tropical mountain rain forest in Jianfengling of Hainan Island was measured from 1992 to 1994 by means of chemical method.Based on the pipe model theory,the simulation models of respiration rate of tree′s non assimilation organs(stem,branch and root)and the respiration rates of leaf were conducted.The results indicated that:the respiration rate of fresh leaf was 70.6 mg CO 2/(kg·h),the amount of respiration of the forest community (tree layer)at the measurement temperature 24.5 ℃ were 3.5～3.6 t/(hm 2.month),of which the stem 1.69～1.73,the branch 0.78～0.79,the leaf 0.81～0.83,the root 0.24～0.25,and yearly respiration was up to 42.2～43.1 t/(hm 2·a).So the community needed to consume the organic dry matter up to 22.7～23.2 t/(hm 2·a).