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林业科学 ›› 2025, Vol. 61 ›› Issue (2): 1-11.doi: 10.11707/j.1001-7488.LYKX20240576

• 特邀综述 • 上一篇    下一篇

病虫害干扰对森林碳汇影响的研究进展

陈汝婷(),迟德富*()   

  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:2024-09-30 出版日期:2025-02-25 发布日期:2025-03-03
  • 通讯作者: 迟德富 E-mail:1391403031@qq.com;chidefu@126.com
  • 基金资助:
    国家重点研发计划项目(2022YFD1401000)。

Effects of Pest and Disease Disturbance on Forest Carbon Sink — a Review

Ruting Chen(),Defu Chi*()   

  1. College of Forestry,Northeast Forestry University Key Laboratory for Sustainable Forest Ecosystem Management of Ministry of Education Harbin 150040
  • Received:2024-09-30 Online:2025-02-25 Published:2025-03-03
  • Contact: Defu Chi E-mail:1391403031@qq.com;chidefu@126.com

摘要:

在全球气候变化背景下,森林生态系统常因本地或外来病虫害的干扰,而影响其物种组成、空间结构、生物多样性以及固碳释氧等功能。森林病虫害干扰对生态系统碳汇的影响主要集中在以下几个方面:1) 降低光合作用效率。当林木遭到病虫危害时,光合速率、气孔导度以及蒸腾作用等光合指标降低,与光合相关的基因下调,参与光合作用的暗反应能力也相应减弱,甚至会因干扰而受到抑制。2) 光合产物减少从而影响生态系统的地上和地下固碳能力。当光合产物减少时,林木自身会将体内的蔗糖重新分配以满足林木新陈代谢需求。林木的根系生物量、土壤自养呼吸能力以及地下碳的长期固存都会因光合产物减少而降低。3) 造成植物组织的损伤,影响宿主的生长、繁殖和生存,从而降低生物多样性、破坏森林结构进而减少功能冗余。4) 被病虫害干扰后的森林生态系统,其存活植物的生长能力以及微生物的分解能力受到长期影响,进而长时间改变森林的固碳能力和增大碳排放。5) 昆虫和微生物可以加速枯木分解并释放碳。取食木材的昆虫不仅可以直接取食和消耗枯木,也可以通过与微生物群落互作,间接对枯木分解产生影响。研究表明,森林病虫害干扰会减少森林面积、降低固碳能力以及增高碳通量,使森林从“碳汇”转变为“碳源”。

关键词: 森林碳汇, 森林生态系统, 病虫害干扰, 光合作用, 碳固定, 碳通量

Abstract:

In the context of global climate change, species composition, spatial structure, biodiversity, carbon sequestration, oxygen release and other functions of forest ecosystems are often affected by local or exotic pests and diseases. The effects of forest pests and diseases on ecosystem carbon sequestration are mainly concentrated in the following aspects: 1) The reduction of photosynthetic efficiency. When trees are damaged by pests and diseases, photosynthetic indicators such as photosynthetic rate, stomatal conductance and transpiration decrease, photosynthetic related genes are downregulated, and the dark reaction ability involved in photosynthesis is weakened or even inhibited due to the interference. 2) The decrease in photosynthate has an impact on both above and below ground ecosystems. When photosynthates decrease, trees themselves redistribute the sucrose in their bodies to meet the needs of forest metabolism. The root biomass, soil autotrophic respiration ability and long-term underground carbon sequestration of forest trees are all reduced due to the decrease of photosynthates. 3)Plant tissues are damaged, which affects the growth, reproduction and survival of the host, thereby reducing biodiversity, destroying forest structure and reducing functional redundancy. 4) After the forest ecosystem is disturbed by pests and diseases, the growth ability of surviving plants and the decomposition ability of microorganisms are affected for a long time, thus changing the carbon sequestration ability of the forest for a long time and increasing the carbon emissions of the forest stand. 5) Insects and microbes can speed up the decomposition of dead wood and release carbon. Wood-feeding insects can not only directly feed on and consume dead wood, but also indirectly affect the decomposition of dead wood through interactions with microbial communities. An increasing number of studies have shown that forest pests and diseases can reduce forest area, reduce carbon sequestration capacity and increase carbon flux, thus transforming forests from “carbon sink” to “carbon source”.

Key words: forest carbon sink, forest ecosystem, pest and disease disturbance, photosynthesis, carbon fixation, carbon flux

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