不同年龄沙地樟子松非结构性碳水化合物分布特征  

Allocation of non-structural carbohydrates of different aged Pinus sylvestris var. mongolica in sandland

作　　者：王凯 逄迎迎 张日升 沈潮 宋立宁[3] WANG Kai;PANG Ying-ying;ZHANG Ri-sheng;SHEN Chao;SONG Lining(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,Liaoning,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]辽宁省沙地治理与利用研究所,辽宁阜新123000 [3]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《生态学杂志》2021年第5期1264-1274,共11页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31400613);国家重点研发计划课题(2017YFD0600505);辽宁省“兴辽英才计划”项目(XLYC1807017)资助。

摘　　要：非结构性碳水化合物(NSC)浓度及其分配特征反映了树木的碳供需状况,是决定树木存活生长的关键因子。为了解沙地樟子松不同生长阶段的碳动态变化规律,以不同年龄(12、22、31、42、52和59年生)沙地樟子松为研究对象,分析叶、枝、根中NSC、可溶性糖和淀粉浓度及可溶性糖/淀粉,探讨沙地樟子松的碳分布特征及平衡关系。结果表明:随着沙地樟子松年龄增加,当年生叶中NSC浓度先下降后上升,可溶性糖浓度先上升后下降,一年生和二年生叶中NSC浓度呈逐渐下降趋势(42年生除外);当年生和一年生枝中NSC和可溶性糖浓度呈先下降后上升再下降趋势,二年生枝中NSC和淀粉浓度先下降后上升,可溶性糖浓度呈上升趋势。樟子松在31年生后根中淀粉浓度呈下降趋势,可溶性糖/淀粉呈增加趋势。总的来说,NSC、可溶性糖和淀粉浓度在各器官中大小顺序为叶>枝>根,而在各器官的变异性为根>枝>叶,可溶性糖/淀粉变异性为叶和根>枝。因此,沙地樟子松NSC及其组分浓度与比例在不同生长阶段做出适应性调节,当根中储存的淀粉开始消耗,NSC在不同器官中分配失衡,沙地樟子松可能发生生长衰退。The concentration and allocation of non-structural carbohydrates(NSC) reflect carbon supply and demand of trees,which is a crucial factor determining the survival and growth of trees.To understand carbon dynamics in different growth stages of Pinus sylvestris var.mongolica,we analyzed the concentrations of NSC,soluble sugar,and starch,and ratio of soluble sugar to starch in needles,branches,and roots of P.sylvestris var.mongolica across a chronosequence(12-,22-,31-,42-,52-,and 59-year-old) and examined the carbon allocation and balance relationships.The results showed that,with the increases of stand age,NSC concentrations decreased first and then increased,whereas soluble sugar concentrations increased and subsequently reduced in current-year needles.However,NSC concentrations in one-and two-year-old needles showed a downward trend with an exception at the stand of 42 years old.The concentrations of NSC and soluble sugar in current-year-old and one-year-old branches exhibited trends of initial decreasing and then increasing afterward decreasing,while NSC and starch concentrations in twoyear-old branches first reduced and subsequently rose.Soluble sugar concentrations showed upward trends in two-year-old branches with stand age.Starch concentrations decreased whereas ratios of soluble sugar to starch increased in roots after the age of 31 years.In general,NSC,soluble sugar and starch concentrations in each organ followed the order of needle > branch > root,while their variabilities followed the order of root > branch > needle.The variability of ratios of soluble sugar to starch followed the order of needle and root > branch.Our results indicated that concentrations of NSC and its components and proportions among different organs of P.sylvestris var.mongolica varied with stand age.Trees would decline when starch in roots was consumed and the allocation of NSC among organs was imbalanced.

关 键 词：樟子松 碳分配 器官 叶龄 枝龄 

分 类 号：S791.253[农业科学—林木遗传育种]