华西雨屏区不同林龄柳杉人工林叶片和细根非结构性碳水化合物质量分数特征  

Characteristics of Non-structural Carbohydrate Content in Leaves and Fine Roots of Cryptomeria japonica var.sinensis Plantations of Different Ages in Rainy Area of Western China

作　　者：简毅[1] 林静[2] 张可欣 慕长龙[2] 潘先敏 谭波[3] 徐振锋[3] 游成铭 徐琳 Jian Yi;Lin Jing;Zhang Kexin;Mu Changlong;Pan Xianmin;Tan Bo;Xu Zhenfeng;You Chengming;Xu Lin(Longmenshan Forest Ecosystem Research Station(Sichuan Academy of Forestry),Mianyang 622550,P.R.China;Sichuan Academy of Forestry;Sichuan Agricultural University)

机构地区：[1]四川龙门山森林生态系统定位观测研究站(四川省林业科学研究院),绵阳622550 [2]四川省林业科学研究院 [3]四川农业大学

出　　处：《东北林业大学学报》2025年第5期41-49,共9页Journal of Northeast Forestry University

基　　金：国家科技部科技基础资源调查专项资金项目(2022FY100200);四川省科技计划资助项目(2024ZYD0069);中国博士后科学基金项目(2023M742511)。

摘　　要：植物的非结构性碳水化合物分配特征,不仅反映了其碳的供需平衡,同时也揭示了植物对环境变化的适应策略。为了解不同生长阶段柳杉叶片和细根中非结构性碳水化合物(NSC)质量分数的特征,以华西雨屏区不同林龄(9、15、25、35、55年生)的柳杉人工林为研究对象,测定了叶片和细根非结构性碳水化合物及其组分(可溶性糖和淀粉)的质量分数,探讨柳杉叶片和细根非结构性碳水化合物质量分数随林龄增加的变化特征。结果表明:①叶片可溶性糖质量分数占非结构性碳水化合物的56.04%~75.52%,且非结构性碳水化合物、可溶性糖质量分数、可溶性糖与淀粉比例均随林龄增加而减小。②细根淀粉质量分数占非结构性碳水化合物的54.25%~62.19%,且非结构性碳水化合物、可溶性糖、淀粉质量分数均随林龄增加呈先上升后下降趋势,在25年生的近熟林中,三者的质量分数均达到最大。③叶片非结构性碳水化合物质量分数仅在近熟林显著低于细根,可溶性糖质量分数仅在幼龄林(9年生)、中龄林(15年生)显著高于细根;而叶片淀粉质量分数在各林龄段均显著低于细根。④冗余分析表明,叶片非结构性碳水化合物主要受土壤全氮、含水率的影响,其贡献率分别为32%、12%;而细根非结构性碳水化合物主要受土壤铵态氮、全磷、pH的调控,其贡献率分别为11.3%、14.2%、11.3%。柳杉通过调控不同器官的碳分配策略以适应生长阶段变化和环境因子的影响,其中叶片以即时碳利用为主,细根则以碳储存为主,二者协同维持植物的碳-养分平衡和生态适应性。The allocation patterns of non-structural carbohydrates(NSC)in plants not only reflect their carbon supply-demand balance but also reveal their adaptive strategies to environmental changes.To understand the characteristics of NSC concentrations in leaves and fine roots of Cryptomeria japonica at different growth stages,this study focused on C.japonica plantations of different stand ages(9,15,25,35,and 55 years)in Rainy Area of Western China.The concentrations of NSC and their components(soluble sugars and starch)in leaves and fine roots were measured,and the variations in NSC concentrations with stand age were analyzed.The results showed that:(1)Soluble sugars accounted for 56.04%-75.52%of the NSC in leaves,and the concentrations of NSC,soluble sugars,and the ratio of soluble sugars to starch decreased with increasing stand age.(2)Starch accounted for 54.25%-62.19%of the NSC in fine roots,and the concentrations of NSC,soluble sugars,and starch in fine roots initially increased and then decreased with stand age,peaking in the 25-year-old near-mature forests.(3)The NSC concentration in leaves was significantly lower than in fine roots only in near-mature forests,while the soluble sugar concentration in leaves was significantly higher than in fine roots only in young(9-year-old)and middle-aged(15-year-old)forests.In contrast,the starch concentration in leaves was significantly lower than in fine roots across all stand ages.(4)Redundancy analysis indicated that leaf NSC was primarily influenced by soil total nitrogen and moisture content,with contribution rates of 32%and 12%,respectively,while fine root NSC was mainly regulated by soil ammonium nitrogen,total phosphorus,and pH,with contribution rates of 11.3%,14.2%,and 11.3%,respectively.C.japonica adapts to changes in growth stages and environmental factors by regulating carbon allocation strategies in different organs:leaves prioritize immediate carbon utilization,while fine roots focus on carbon storage,synergistically maintaining the plant’s carbon-nutrient bal

关 键 词：林龄 柳杉人工林 叶片 细根 非结构性碳水化合物 

分 类 号：S791.31[农业科学—林木遗传育种]