Microbial activity and litter decomposition under snow cover in a cool-temperate broad-leaved deciduous forest

Masaki Uchida, Wenhong Mo, Takayuki Nakatsubo, Yuki Tsuchiya, Takao Horikoshi, Hiroshi Koizumi

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

Winter CO2 emissions from soil and snow-covered surfaces can represent a significant fraction of the annual carbon cycle in cool-temperate broad-leaved deciduous forests. The sources of this CO2 production are, however, poorly understood. To clarify the role of saprophytic microorganisms in the carbon cycle during the winter (December-April), mass loss rates of organic substrates (leaf litter and cellulose sheets), and microbial activity and fungal biomass in the litter layer of a cool-temperate broad-leaved deciduous forest in Japan were investigated. The mass loss rate of leaves reached 13%, which accounted for 26% of the annual mass loss. Microbial respiration in the leaf litter, measured in the laboratory, was detected even at -2°C. The ergosterol content (an indicator of fungal biomass) of the cellulose sheets increased significantly in the snow-covered season. Seven genera of fungi including Varicosporium elodeae, Epicoccum purpurascens and Cylindrocarpon destructans were isolated from leaf litter collected from under snow cover. Microbial respiration during the winter was estimated based on the relationships between the amount of leaf litter available, the temperature dependency of microbial respiration and the temperature in the litter layer. The microorganisms in the litter layer emitted 31 gCO2-C m-2, which accounts for 38% of the total CO2 efflux during the winter. These results suggest that through soil respiration, microorganisms in the litter layer play an important role in the carbon cycle during the winter.

Original languageEnglish
Pages (from-to)102-109
Number of pages8
JournalAgricultural and Forest Meteorology
Volume134
Issue number1-4
DOIs
Publication statusPublished - 2005 Nov 30
Externally publishedYes

Keywords

  • Cool-temperate forest
  • Ergosterol
  • Litter layer
  • Microbial activity
  • Snow-covered season
  • Soil respiration

ASJC Scopus subject areas

  • Forestry
  • Atmospheric Science

Fingerprint Dive into the research topics of 'Microbial activity and litter decomposition under snow cover in a cool-temperate broad-leaved deciduous forest'. Together they form a unique fingerprint.

Cite this