广东森林松类下木碳含量和热值特征  

Carbon Content and Calorific Value in Pine Understory Vegetation in Guangdong Forests

作　　者：张红爱 杨加志 丁胜 汪求来 黄宁辉 苏晨辉 陈盼 杨志刚 ZHANG Hong′ai;YANG Jiazhi;DING Sheng;WANG Qiulai;HUANG Ninghui;SU Chenhui;CHEN Pan;YANG Zhigang(Guangdong Forestry Survey and Planning Institute,Guangzhou,Guangdong 510520,China)

机构地区：[1]广东省林业调查规划院,广东广州510520

出　　处：《林业与环境科学》2025年第2期72-76,共5页Forestry and Environmental Science

基　　金：广东省林业科技创新平台建设项目(2016CXPT03);广东省低碳发展专项资金支持项目(办资字[2012]14号);广东省林业科技创新专项基金科研项目(2012KFCX019-01)。

摘　　要：为准确估测森林碳储量和碳汇能力、以及下木的生物质利用提供基本信息,研究采用湿烧法对湛江市廉江市和河源市龙川县松林样地的松类下木(简称松类下木)进行碳含率测定,同时采用氧弹燃烧法对其相应的热值进行了分析。结果显示,龙川县松类下木的碳含率(514.62 g·kg^(-1))显著高于廉江市(497.69 g·kg^(-1))(P<0.05),树干、树根和整株碳含率在不同地域间存在显著差异(P<0.05),树枝、树叶的碳含率差异不显著;不同地域、径阶的松类下木的热值特征差异不显著,树叶的热值最高,树根最低;松类下木的碳含率和热值之间相关性不显著。径阶对热值没有显著影响,可能处于幼龄期的树木尚未完成生理成熟过程,其径向生长与热量转化效率尚未形成显著梯度;是否亚热带比热带更利于松类下木将太阳能转化成化学能,有待于进一步研究。To fundamental information for accurately estimating forest carbon storage and carbon sink ca-pacity and evaluating the biomass utilization potential of understory vegetation,this study utilized the wet com-bustion method to determine the carbon content of Pine understory vegetation in Lianjiang city(Zhanjiang)and Longchuan county(Heyuan),while simultaneously analyzing their corresponding calorific values using oxygen bomb calorimetry.The results showed that the carbon content rate of the Pine understory in Longchuan county(514.62 g·kg^(-1))was significantly higher than that in Lianjiang city(497.69 g·kg^(-1))(P<0.05).There were significant differences in the carbon content of trunk,root,and the whole plant among different regions(P<0.05),but there was no significant difference in the carbon content of branches and leaves.There was no significant difference in the calorific value characteristics of Pine understory in different regions and diameter classes.The calorific value of leaves was the highest and the that of roots was the lowest.The correlation between carbon content and calorific value of Pine understory was not significant.The lack of significant effect of diame-ter class on calorific value,is likely attributable to the juvenile period stage of these trees,where incomplete physiological development results in limited variation in carbon storage capacity.Whether the subtropical climates enhance the photosynthetic energy conversion efficiency of Pine understory vegetation compared to tropical cli-mates requires further investigation.

关 键 词：下木 松类 碳含率 热值 

分 类 号：S718[农业科学—林学]