中国不同地带性森林乔木叶片热值特征及其影响因素  

Changes in Leaf Calorific Value in Main Chinese Forests and Its Influencing Factors

作　　者：宋广艳[1,2] 何念鹏[2] 侯继华[1] 

机构地区：[1]北京林业大学森林资源与生态系统过程北京市重点实验室,北京100083 [2]中国科学院地理科学与资源研究所,生态系统网络观测与模拟重点实验室,北京100101

出　　处：《林业科学研究》2016年第1期133-139,共7页Forest Research

基　　金：国家自然科学基金资助项目(31270519,31070431);中科院地理所可桢杰出青年人才项目(2013RC102)

摘　　要：叶片是植物进行光合作用的主要场所,是反映植物生命活动变化规律最敏感的器官,其性状直接影响到植物的基本行为和功能[1]。热值（CV）是植物相对稳定的一个性质,即指单位质量干物质完全燃烧所释放的热量值（KJ·g-1）,与光合作用、呼吸作用等多种生理活动密切有关,[Objective]To study the leaf calorific value of different forest types. [Method]This study focused on four common forest types widely distributed across China,including boreal coniferous forest,warm temperate deciduous broad-leaved forest,subtropical evergreen broad-leaved forest,and tropical monsoon forest. The leaf calorific values of 175 dominant（ or common） tree species were measured. The leaf calorific value characteristics of the trees found in the different forest types were analyzed,and the primary factors affecting leaf calorific value were investigated,including leaf morphological traits,nutrient elements,climate,and soil traits. [Result]The results showed that in these forest types,the leaf calorific values ranged from 14. 84 to 21. 98 KJ·g- 1,with an overall mean of19. 06 KJ·g- 1. The presence of organisms appeared to affect the leaf calorific value,which differed among forest types as follows： coniferous trees broadleaf trees or evergreen trees deciduous trees. [Conclusion]The latitudinal pattern of tree leaf calorific value,ordered from north to south,is as follows： warm temperate deciduous broadleaved forest subtropical evergreen broad-leaved forest tropical mountain rainforest. The mean leaf calorific value of boreal coniferous forest was slightly lower than those of warm temperate deciduous broad-leaved forest and subtropical evergreen broad-leaved forest. The leaf calorific values were significantly correlated with leaf carbon content（ R2= 0. 89,P 0. 001）. A multiple regression equation was established to describe the relationships among leaf calorific value,leaf carbon content,leaf nitrogen content,and leaf thickness.

关 键 词：森林 乔木 生活型 叶片热值 叶片性状 

分 类 号：S718.5[农业科学—林学]