植物生态学报 ›› 2025, Vol. 49 ›› Issue (12): 2105-2118.DOI: 10.17521/cjpe.2024.0372  cstr: 32100.14.cjpe.2024.0372

• 研究论文 • 上一篇    下一篇

火后时间对大兴安岭越橘叶-枝-根非结构性碳水化合物的影响

陆磊琴, 孙龙, 宋宇轩, 杨光, 蔡慧颖*()   

  1. 东北林业大学林学院, 森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040
  • 收稿日期:2024-10-21 接受日期:2025-02-26 出版日期:2025-12-20 发布日期:2025-12-29
  • 通讯作者: *蔡慧颖(caihy0606@126.com)
  • 基金资助:
    黑龙江省自然科学基金(YQ2024C032);中央高校基本科研业务费专项资金项目(2572023CT01)

Post-fire time impacts on nonstructural carbohydrates in leaves-branches-roots of Vaccinium vitis-idaea in Da Hinggan Mountains

LU Lei-Qin, SUN Long, SONG Yu-Xuan, YANG Guang, CAI Hui-Ying*()   

  1. College of Forestry, Northeast Forestry University, Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Harbin 150040, China
  • Received:2024-10-21 Accepted:2025-02-26 Online:2025-12-20 Published:2025-12-29
  • Supported by:
    Natural Science Foundation of Heilongjiang(YQ2024C032);Fundamental Research Funds for the Central Universities(2572023CT01)

摘要:

近年来, 极端气候引发的火灾对森林生态系统造成严重破坏, 导致树木死亡率急剧上升。非结构性碳水化合物(NSC)能够反映植物对火后环境变化的响应以及自身的适应策略。然而, 目前关于植物不同器官NSC浓度随火后时间的变化规律和响应机制研究较少。该研究采用“空间替代时间”的方法, 在大兴安岭呼中区选取4个不同火烧时间的重度火烧样地和1个临近未火烧样地, 以当地优势灌木越橘(Vaccinium vitis-idaea)为研究对象, 分别采集不同年龄的叶片和枝条(当年生和多年生)、细根和根际土壤样品, 测定越橘各器官的可溶性糖和淀粉浓度、叶片和细根的功能性状特征和土壤属性。结果表明: 越橘不同器官NSC浓度的大小顺序为叶>枝>根; 火后当年生叶可溶性糖浓度显著增加, 而多年生叶淀粉浓度显著增加; 火后2-10年, 当年生枝淀粉浓度显著高于多年生枝; 枝和根的NSC浓度在火后18年仍与未火烧时差异显著。此外, 叶片NSC浓度与土壤pH、比叶面积和叶片氮含量显著负相关; 枝条NSC浓度与火后时间和土壤有效磷含量显著正相关、与细根氮含量显著负相关; 细根NSC浓度与火后时间正相关、与细根氮含量负相关。综上, 越橘叶-枝-根NSC浓度对火后时间的响应具有明显的器官差异性, 这对于准确理解火后恢复过程中植物的生理生态变化特征具有重要意义。

关键词: 林火干扰, 叶龄, 可溶性糖, 土壤属性, 植物性状

Abstract:

Aims In recent years, fires triggered by extreme weather have caused severe damage to forest ecosystems, leading to a sharp increase in tree mortality. Non-structural carbohydrates (NSC) can reflect the response of plants to post-fire environmental changes and their adaptive strategies. However, few studies have explored the changing patterns and response mechanisms of NSC concentrations in different plant organs with time post fire.

Methods In the Huzhong area of the Da Hinggan Mountains, four severely burned plots at different burn times and one adjacent unburned plot were selected using the “space for time” method. The local dominant shrub species, Vaccinium vitis-idaea, was chosen, and the leaves and branches of different ages (current year and perennial), fine roots and rhizosphere soil samples were collected, further determining organ soluble sugar and starch concentrations, functional traits of leaves and fine roots, and the soil properties.

Important findings The order of NSC concentrations in different organs of V. vitis-idaea was leaves > branches > fine roots. The soluble sugar concentration of current year leaves increased significantly after fire, whereas the starch concentration of perennial leaves increased remarkably. The starch concentration of current year branches was significantly higher than that of perennial branches from 2 to 10 years post fire. The NSC concentrations of branches and fine roots 18 years post fire differed substantially from those at unburned plot. In addition, leaf NSC concentration was negatively correlated with soil pH, leaf specific area and leaf nitrogen content. Furthermore, branch NSC concentration was positively correlated with time post fire and soil available phosphorus content, but negatively correlated with fine root nitrogen content. Fine root NSC concentration was positively correlated with time post fire while negatively correlated with fine root nitrogen content. In conclusion, the responses of V. vitis-idaea NSC concentrations to time post fire varied among organs, which is of great significance to accurately understanding the physiological and ecological changes of plants during post fire recovery.

Key words: forest fire disturbance, leaf age, soluble sugar, soil properties, plant trait