生态环境学报 ›› 2023, Vol. 32 ›› Issue (8): 1376-1383.DOI: 10.16258/j.cnki.1674-5906.2023.08.003

• 研究论文【生态学】 • 上一篇    下一篇

云南松林计划烧除地表碳损失量及碳排放量估算

宋灯辉(), 付迪, 黎建强(), 付钇珊, 邢学霞, 田原   

  1. 西南林业大学生态与环境学院,云南 昆明 650224
  • 收稿日期:2023-03-03 出版日期:2023-08-18 发布日期:2023-11-08
  • 通讯作者: *黎建强。E-mail: JQ-Lee83125@hotmail.com
  • 作者简介:宋灯辉(1990年生),男,硕士研究生,研究方向为水土保持与荒漠化防治。E-mail: 438793140@qq.com
  • 基金资助:
    国家自然科学基金项目(32060345);国家自然科学基金项目(31660146);云南省科技重大专项计划(202102AE090042-03);昆明市科技“揭榜挂帅制”项目(2021-J-H-002-02);云南省“兴滇英才支持计划”青年人才专项(XDYC-QNRC-2022-0205)

Estimation of Carbon Loss and Carbon Emissions Caused by Prescribed Burning in Pinus yunnanensis Forest

SONG Denghui(), FU Di, LI Jianqiang(), FU Yishan, XING Xuexia, TIAN Yuan   

  1. College of Ecology and Environment, Southwest Forestry University, Kunming 650224, P. R. China
  • Received:2023-03-03 Online:2023-08-18 Published:2023-11-08

摘要:

计划烧除作为一项重要的营林措施,是科学预防森林火灾的重要手段,同时也对森林生态系统碳循环过程与碳分配产生着深刻的影响。科学有效地评估计划烧除对云南松(Pinus yunnanensis)林地可燃物载量及碳储量的影响,准确估算计划烧除地表碳损失量和含碳气体的排放量,对于定量评估计划烧除对云南松林碳源/汇的影响具有重要意义。以云南松林为研究对象,通过对草灌层、枯落物层及土壤有机质层可燃物载量的调查和含碳率的测定,对计划烧除对地表可燃物载量和碳储量的影响进行了研究,并在此基础上通过对计划烧除燃烧效率、含碳气体排放因子的测定,对计划烧除过程中总碳和含碳气体的排放量进行了估算。研究结果表明,1)实施计划烧除能有效减少地表可燃物载量,实施计划烧除林地总可燃物载量比未实施计划烧除林地减少了62.5%;计划烧除显著减少了林地地表碳储量,实施计划烧除的林地地表碳储量比未实施计划烧除林地减少了60.9%。2)云南松林计划烧除过程中碳排放量总和为0.24 t?hm-2,以枯落物层燃烧过程中碳排放量最高,占总碳排放量的63.5%。3)云南松林计划烧除过程中主要含碳气体排放量总量为773 kg?hm-2,其中CO2、CO、CH4和NMHC排放总量分别为723、47.1、1.90、和1.41 kg?hm-2。计划烧除能够有效减少地表可燃物载量,总碳排放量和含碳气体排放量显著小于森林火灾,是一种以小规模泄漏代替重特大森林火灾造成大量碳排放的森林管理模式。

关键词: 云南松林, 计划烧除, 可燃物载量, 碳储量, 碳排放, 排放因子

Abstract:

Prescribed burning is one of the main strategies in forest management for fire prevention, and it also has a profound impact on the carbon cycle and carbon allocation in forest ecosystem. It is of great significance to scientifically evaluate the reduction of fuel load and carbon storage in the forest floor, and accurately estimate the total carbon and carbonaceous gases emissions during prescribed burning for the quantitative evaluation of the effects of prescribed burning on the Pinus yunnanensis forest that serves as a carbon source sink. Taking Pinus yunnanensis forest as the research object, this study analyzed the effects of prescribed burning on fuel load and carbon storage in the forest floor by investigating the fuel load of shrubs and herbs, litters and duff and measuring the carbon content, and then the emissions of total carbon and carbonaceous gases during prescribed burning were estimated by investigating the combustion efficiency and determining carbonaceous gases emission factors. The results showed that 1) the fuel load and carbon storage in forest floor were significantly decreased by prescribed burning. The fuel load and carbon storage in forest floor with prescribed burning were decreased by 62.5% and 60.9%, respectively, compared with that without prescribed burning; 2) the total carbon emission during prescribed burning in Pinus yunnanensis forest was 0.24 t?hm-2, and carbon emission of litters contributed, on average, 63.5% to the total carbon emission; 3) the total carbonaceous gases emissions during prescribed burning reached 773 kg?hm-2, and carbonaceous gases emissions for CO2, CO, CH4, and NMHC were 723 kg?hm-2, 47.1 kg?hm-2, 1.90 kg?hm-2 and 1.41 kg?hm-2, respectively. The results implied that the prescribed burning is efficient in fuel load reduction and has significantly lowered carbon emissions compared to forest fires.

Key words: Pinus yunnanensis forest, prescribed burning, fuel load, carbon storage, carbon emission, emission factor

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