摘 要 ：采用红外CO2分析仪离体测定了鹤山丘陵马占相思(Acacia mangium)的树干、树枝、树叶和树根等器官的呼吸速率，根据管道模型理论(Pipe model theory)，测出马占相思各木质器官直径频度分布的函数表达式、呼吸速率与直径的幂函数关系表达式和林木各器官呼吸量的表达式。结果表明：各木质器官的呼吸速率与直径呈负相关，林木各器官的呼吸量则与胸径和树高(D2H)呈正相关；马占相思林的年总呼吸量(乔木层)为47.51 tCO2·hm-2, 其中树干、树枝、树叶、树根分别占总量的23.1％、13.9％、48.7％和14.4％，树叶占总量的近一半。
Abstract:The total respiration rate of artificial Acacia mangium forest (tree layer) was estimated in low subtropical hill region of Guangdong province. The respiration rate was determined by infra-red CO2 gas analyzer with a large number of detached samples of leaves and woody organs taken from trees of various sizes. Using pipe model theory, the formulas of diameter frequency distribution and the relation of the respiration to its diameter for woody organs were established. Accordingly the formulas for total respiration rate of woody organs and leaves were then given. Results showed that the respiration rate of woody organs was negatively correlated with diameter and the total respiration rate was positively correlated with DBH and height (D2H). The yearly total respiration rate of Acacia mangium forest was calculated to be 47.51 t CO2·hm-2, trunk, branch, leaf and root accounted for 23.1%, 13.9%, 48.7 % and 14.4 % to the total respiration rate, respectively.