Survey for ectomycorrhizal fungal resources as a stepping stone for hardwood seedling introduction

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06150
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40010:Forest science-related
• Research Institution: Tokyo University of Agriculture
• Principal Investigator: Tanaka Megumi 東京農業大学, 地域環境科学部, 准教授 (40401301)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 広葉樹二次林 / 外生菌根菌 / 菌類リソース / 境界域 / 子実体

Outline of Final Research Achievements

Ectomycorrhizal fungal communities were examined in a secondary forest near an artificial forest to estimate the mycorrhizal fungal species capable of infecting newly invading seedlings. The results showed that the species composition of ectomycorrhizal fungi varied with distance from the boundary in adjacent forests of different mycorrhizal types, but a diversity of species was observed in mixed-species forests, and a trend was observed between different above-ground forest environments and changes in the ectomycorrhizal fungi community in small secondary forests. A total of 177 species of ectomycorrhizal fungal sporocarps were detected, indicating that the emergent species may vary depending on topographical features and the difference of canopy tree species. It is possible that the distribution area and the emergent species of spore-dispersing mycorrhizal fungi in the secondary forests may vary depending on the local site environment.

Free Research Field

森林微生物学

Academic Significance and Societal Importance of the Research Achievements

針葉樹人工林の針広混交林化や広葉樹林化は、森林の多様で健全な発達のための手段であり、公益的機能を発揮させるものとして期待されている。日本の人工林の大部分を占めるスギやヒノキはアーバスキュラー菌根性樹種であるため、これらの樹種が長期間生育している林地に広葉樹を導入する場合には、感染可能な外生菌根菌リソースが存在しているか否かが導入広葉樹の生残を決定する重要な要因になると考えられる。そこで針葉樹人工林と広葉樹二次林が小面積でモザイク状に存在し、感染可能域の比較的大きい林地において新たに侵入する広葉樹実生に感染可能な菌根菌種とその多様性を調べた。