In forest ecosystems, mycorrhizal fungal hyphae were shown to be a large below-ground carbon storage and constitute a high proportion of soil CO 2 efflux by their respiration. The objective of this study was to estimate and compare hyphal growth and respiration in C. obtusa ( a r b u s c u l a r m y c o r r h i z a l , A M ) a n d Q . s e r r a t a (ectomycorrhizal, EM) dominated warm-temperate forest stands in Western Japan. Mycorrhizal fungal hyphae were sampled with sand-filled in-growth

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... bags placed in the upper soil of two C. obtusa and two Q. serrata plots for two months from May 2015. Total hyphal growth was determined by hyphal length measurement and type-specific (EM/AM) hyphal growth by analysis of phospholipid-derived fatty acids. Total hyphal respiration was estimated by measuring CO 2