植物生态学报 ›› 2022, Vol. 46 ›› Issue (6): 722-734.DOI: 10.17521/cjpe.2021.0467

• 研究论文 • 上一篇    

温带不同材性树种树干非结构性碳水化合物的径向分配差异

董涵君1, 王兴昌1, 苑丹阳1, 柳荻1, 刘玉龙2, 桑英3, 王晓春1,*()   

  1. 1东北林业大学生态研究中心, 森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040
    2黑龙江省生态研究所, 哈尔滨 150040
    3东北林业大学林学院, 哈尔滨 150040
  • 收稿日期:2021-12-10 接受日期:2022-02-18 出版日期:2022-06-20 发布日期:2022-04-25
  • 通讯作者: 王晓春
  • 作者简介:*(wangx@nefu.edu.cn) ORCID:王晓春: 0000-0002-8897-5077
  • 基金资助:
    国家重点研发计划(SQ2021YFD220008501);国家自然科学基金(41877426);国家自然科学基金(42177421)

Radial distribution differences of non-structural carbohydrates in stems of tree species of different wood in a temperate forest

DONG Han-Jun1, WANG Xing-Chang1, YUAN Dan-Yang1, LIU Di1, LIU Yu-Long2, SANG Ying3, WANG Xiao-Chun1,*()   

  1. 1Center for Ecological Research, Key Laboratory of Sustainable Forestry Ecosystem Management-Ministry of Education, Northeast Forestry University, Harbin 150040, China
    2Heilongjiang Ecological Institute, Harbin 150040, China
    3School of Forestry, Northeast Forestry University, Harbin 150040, China
  • Received:2021-12-10 Accepted:2022-02-18 Online:2022-06-20 Published:2022-04-25
  • Contact: WANG Xiao-Chun
  • Supported by:
    National Key R&D Program of China(SQ2021YFD220008501);National Natural Science Foundation of China(41877426);National Natural Science Foundation of China(42177421)

摘要:

温带森林不同树种具有不同的非结构性碳水化合物(NSC)存储和利用策略, 树干是成年树木NSC主体储存库。但树干NSC径向变异和种间差异仍不清楚, 无孔材(裸子植物)、散孔材和环孔材(被子植物)所代表的木材孔性功能群对树干NSC浓度的影响尚缺乏定论。为探索温带森林主要树种树干NSC浓度随树木木材孔性和组织的变化特征, 该研究在黑龙江省穆棱市的东北典型阔叶红松(Pinus koraiensis)林中选择32个树种, 采集胸高位置树皮、边材和心材3种组织, 分析NSC浓度随木材孔性和组织的变化特征。结果表明: (1)树种、组织和木材孔性均显著影响树干的NSC浓度。3种组织可溶性糖、淀粉、总NSC浓度和糖/淀粉的种间变异较大, 变异系数最低为37% (树皮总NSC浓度), 最高达到101% (心材淀粉浓度), 树干组织、树种及其交互作用均显著影响NSC浓度。(2)总体上可溶性糖、淀粉和总NSC浓度均随径向深度增加而降低。无孔材树皮的可溶性糖浓度和糖/淀粉显著高于散孔材和环孔材, 而边材中的淀粉和总NSC浓度为环孔材>散孔材>无孔材。(3)无孔材可溶性糖、淀粉和总NSC浓度边材和心材比均在1左右, 显著低于散孔材和环孔材, 而且无孔材边材和心材之间淀粉浓度相关较紧密, 表明被子植物的边材、心材功能分化较裸子植物更为明显。研究结果表明木材孔性影响了温带树种树干NSC存储策略, 研究整树NSC以及树木生理生态学功能需要区分树干组织。

关键词: 非结构性碳水化合物, 温带森林, 树干, 可溶性糖, 淀粉

Abstract:

Aims Temperate forest tree species adopt different strategies in storing and utilizing non-structural carbohydrates (NSC). Trunk is the main storage pool of NSC. However, the radial variation and interspecific difference of trunk NSC are still unclear, and how wood porous group—non-porous wood (gymnosperms), diffuse-porous wood and ring-porous wood (both are angiosperms)—influences NSC concentrations of trunks is still uncertain. The objective of this study was to explore the variation of trunk NSC concentrations of major tree species in temperate forests with wood porosity and trunk tissues.

Methods We selected 32 tree species in a broadleaved and Pinus koraiensis mixed forest in Muling City, Heilongjiang Province. Bark, sapwood, and heartwood of stem at the breast height were collected to analyze the variation of NSC concentrations with wood porosity and tissue.

Important findings (1) Tree species, tissue and wood porosity significantly affected the NSC concentration of trunk. The interspecific variation of concentrations of soluble sugars, starch, total NSC and sugar/starch in the three tissues was large, with the lowest coefficient of variation of 37% (total NSC concentration in bark) and the highest of 101% (starch concentration in heartwood). Tissue, species and their interactions significantly affected trunk NSC concentration. (2) The concentrations of soluble sugar, starch and total NSC decreased with the increasing radial depth. The concentration of soluble sugars and sugar/starch in bark of non-porous species was significantly higher than those of diffuse-porous and ring-porous species. The concentration of starch and total NSC in sapwood was in the order of ring-porous > diffuse-porous > non diffuse-porous wood species. (3) The ratio of soluble sugars, starch and total NSC concentrations in sapwood to in heartwood was about 1 for non-porous wood species, which was significantly lower than those for diffuse-porous and ring-porous wood species, and the correlation of the starch concentration between sapwood and heartwood of non-porous wood was more significant than that of the other two wood-porous types, indicating that the functional differentiation between sapwood and heartwood was clearer for angiosperms than for gymnosperms. These results revealed that wood porosity influenced storage strategy of NSC in trunks of temperate tree species, and it was necessary to distinguish trunk tissues in the study of the whole-tree NSC storage and the ecophysiological function of trees.

Key words: non-structural carbohydrate, temperate forest, trunk, soluble sugar, starch