不同杉木林分类型乔木层生物量与碳储量及养分分布特征  

Biomass, Carbon Storage and Nutrient Distribution Characteristics of Different Cunninghamia lanceolata Stand Types

作　　者：蒋晨阳 李宪 张涵[1] 崔宇鸿 叶绍明[1] Jiang Chenyang;Li Xian;Zhang Han;Cui Yuhong;Ye Shaoming(Guangxi University,Nanning 530004,P.R.China)

机构地区：[1]广西大学,南宁530004

出　　处：《东北林业大学学报》2023年第9期8-14,共7页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(32260382)。

摘　　要：以中国林业科学研究院热带林业实验中心杉木(Cunninghamia lanceolata)纯林、杉木-米老排(Mytilaria laosensis)混交林和杉木-火力楠(Michelia macclurei)混交林为研究对象,采用生物量回归模型法,对不同林分乔木层(树干、树皮、树枝、树叶、树根)的生物量进行计算,测定林木各器官的含碳率和养分质量分数,计算林分乔木层碳储量,采用冗余分析探究了不同林分树木器官养分质量分数与乔木层生物量和碳储量的相关性。结果显示:杉木-米老排混交林和杉木-火力楠混交林乔木层生物量分别为127.55、154.71 t/hm2,高于杉木纯林乔木层生物量(117.84 t/hm2);杉木纯林、杉木-米老排混交林、杉木-火力楠混交林乔木层碳储量分别为57.38、71.05、77.10 t/hm2,树干是储碳最多的器官,对林分碳储量的贡献最大;乔木层各器官元素质量分数总体上以杉木-火力楠混交林中的火力楠叶片N质量分数最高(24.63 g/kg)、杉木纯林树干Mg质量分数最低(0.06 g/kg)。冗余分析结果显示,乔木层生物量和碳储量明显受到不同乔木器官的影响,其中,树根Ca和树干N质量分数主要影响了生物量的变化,树枝Mg和树干N质量分数主要影响碳储量的变化。综上所述,杉木和阔叶树种混交显著提高了乔木层的生物量和碳储量;乔木层各器官养分质量分数和分布受到林分类型的显著影响;阔叶树种与杉木混交有利于林分生物量的积累和碳汇能力的提升,是实现森林可持续发展和近自然经营的重要途径。Taking pure Cunninghamia lanceolata plantation (CL), mixed plantation of C. lanceolata and Mytilaria laosensis (CML) and mixed plantation of C. lanceolata and Michelia macclurei (CMM) at the Experimental Center of Tropical Forestry Chinese Academy of Forestry as the research object, the biomass of tree layer (trunk, bark, branches, leaves and roots) of different stands was calculated by the biomass regression model, meanwhile the carbon and nutrient contents of each organ were measured, and the carbon storage of tree layer was calculated. The redundancy analysis (RDA) was used to explore the correlation between the nutrient content of tree organs and the biomass and carbon storage of tree layers in different stands. The results showed that, the tree layer biomass of CML and CMM were 127.55 and 154.71 t/hm 2, respectively, which were higher than that of CL (117.84 t/hm 2). The tree layer carbon storage of CL, CML and CMM were 57.38, 71.05 and 77.10 t/hm 2, respectively. The trunk is the organ that stores the most carbon and contributes most to the carbon storage of the stand. Overall, the N content in leaves of Michelia macclurei in CMM was the highest element (24.63 g/kg) and the Mg content of trunk in CLwas the lowest element (0.06 g/kg) in each organ in the tree layer. According to the RDA results, the biomass and carbon storage in the tree layer were obviously affected by different tree organs. The elementcontents of Ca in the root and N in the trunk mainly affected the changes of biomass, while the elementcontents of Mg in the branch and N in the trunk mainly explained the changes of carbon storage. The mixture of C. lanceolata and broad-leaved tree species significantly increased the biomass and carbon storage of tree layer. The nutrient content and distribution of each organ in the tree layer were significantly affected by the stand type. The mixture of broad-leaved tree species and C. lanceolata is beneficial to the accumulation of biomass and the enhancement of carbon sequestration capacity, which is an i

关 键 词：杉木 纯林 混交林 生物量 碳储量 养分质量分数 

分 类 号：S718.54[农业科学—林学]