植物生态学报 ›› 2023, Vol. 47 ›› Issue (6): 792-803.DOI: 10.17521/cjpe.2022.0333

• 研究论文 • 上一篇    下一篇

火烧黑碳对生长季兴安落叶松林外生菌根真菌群落物种组成的影响

胡同欣, 李蓓, 李光新, 任玥霄, 丁海磊, 孙龙()   

  1. 森林生态系统可持续经营教育部重点实验室, 东北林业大学林学院, 哈尔滨 150040
  • 收稿日期:2022-08-18 接受日期:2022-11-11 出版日期:2023-06-20 发布日期:2022-11-11
  • 通讯作者: * (sunlong365@126.com)
  • 作者简介:ORCID:胡同欣: 0000-0003-3197-5145
  • 基金资助:
    国家自然科学基金(32001324);中国科协青年托举工程项目(YESS20210370);黑龙江省自然基金优秀青年-联合引导项目(LH2021C012)

Effects of fire originated black carbon on species composition of ectomycorrhizal fungi in a Larix gmelinii forest in growing season

HU Tong-Xin, LI Bei, LI Guang-Xin, REN Yue-Xiao, DING Hai-Lei, SUN Long()   

  1. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, Harbin 150040, China
  • Received:2022-08-18 Accepted:2022-11-11 Online:2023-06-20 Published:2022-11-11
  • Contact: * (sunlong365@126.com)
  • Supported by:
    National Natural Science Foundation of China(32001324);Young Elite Scientists Sponsorship Program by China Association for Science and Technology(YESS20210370);Excellent Youth Joint Guidance Project of Heilongjiang Natural Science Foundation(LH2021C012)

摘要:

火烧是北方森林生态系统的重要扰动因子, 而黑碳作为火烧后的产物在森林土壤中普遍存在。虽然黑碳对树木生长有积极影响, 但对黑碳和促进树木生长的微生物(如菌根真菌)之间的协同作用还知之甚少。外生菌根(ECM)真菌作为北方森林生态系统中针叶树种与土壤联系的桥梁, 探究火烧后ECM真菌群落的变化可为火烧后北方森林生态系统碳库恢复与科学管理提供理论依据。该研究以大兴安岭地区兴安落叶松(Larix gmelinii)林为研究对象, 利用高通量测序的方法对ECM真菌进行鉴定, 探究生长季中火烧和黑碳添加处理下ECM真菌群落的变化特征及其关键影响因子。研究结果显示: (1)在生长季中, 与对照相比, 火烧处理下ECM真菌的α多样性显著下降了31.52%, 而黑碳添加处理下的α多样性显著增加了49.02%。β多样性分析也显示生长季中火烧和黑碳添加处理下ECM真菌群落物种组成存在显著差异。(2)在生长季中, 火烧处理的ECM真菌的丰度显著下降了46.35%, 但火烧处理对担子菌门物种丰度的增加影响显著, 而黑碳添加处理对子囊菌门与担子菌门物种丰度的增加均有影响。(3)在生长季中, 火烧和黑碳添加处理中ECM真菌群落物种组成均受到土壤pH、含水率和全氮含量的显著影响, 但在黑碳添加处理中与土壤pH和全氮含量正相关, 与土壤含水率负相关。该研究表明, 火烧降低了生长季中兴安落叶松林ECM真菌的多样性, 并显著降低了其丰度。但是, 火烧后黑碳的添加通过影响土壤pH以及土壤氮含量, 促进了ECM真菌恢复并增加了其多样性。

关键词: 火烧, 兴安落叶松, 外生菌根真菌, 黑碳, 多样性

Abstract:

Aims Fire is an important disturbance factor in the northern forest ecosystem, and black carbon, a product of fire, widely exists in most forest soils. Many studies have shown the positive impact of black carbon on plant yield, but little is known about the synergy between black carbon and microorganisms (such as mycorrhizal fungi) which can promote plant growth. Ectomycorrhiza (ECM) fungi is like a bridge between coniferous trees and soil in the northern forest ecosystem. Exploring the changes of ECM fungal community after fire can provide a theoretical basis for the carbon pool restoration and help with scientific management of the northern forest ecosystem after fire.

Methods In this study, Larix gmelinii forest in the Da Hinggan Mountains was taken as the research object. Samples were taken at the beginning of the growing season (June) and at the end of the growing season (September) after fire disturbance. ECM fungi were identified by high-throughput sequencing method to explore the changes and key influencing factors of ECM fungal community under the treatment of fire and black carbon addition.

Important findings The results showed that: (1) During the growing season, compared with CK, the α-diversity of ECM fungal community treated by fire decreased significantly by 31.52%, while it increased significantly by 49.02% under black carbon addition treatment. There were significant differences in the β-diversity of of ECM fungal community under fire and black carbon addition treatments during the growing season. (2) During the growing season, the abundance of ECM fungi treated by fire decreased significantly by 46.35%, but the fire treatment significantly increased Basidiomycetes species abundance, while black carbon addition treatment increased Ascomycetes and Basidiomycetes species abundance. (3) During the growing season, the composition of ECM fungal community in Larix gmelini forest was significantly affected by soil pH, water content and total nitrogen content under the fire and black carbon addition treatments, but it was positively correlated with soil pH and total nitrogen content and negatively correlated with soil water content in the black carbon addition treatment. The results of this study showed that fire reduced the diversity of ECM fungi in Larix gmelinii forest during the growing season, and significantly reduced the abundance of ECM fungi. However, the addition of black carbon after fire may change this negative effect. By affecting the changes of soil pH and soil nitrogen content, black carbon promoted the recovery of ECM fungi and increased its diversity. Therefore, the long-term impact of black carbon on ECM fungal community should be continuously monitored in the future.

Key words: fire, Larix gmelinii, ectomycorrhizal fungi, black carbon, diversity