Soil moisture effects on leaf litter decomposition and soil carbon dioxide efflux in wetland and upland forests

Tae Kyung Yoon, Nam Jin Noh, Saerom Han, Jongyeol Lee, Yo Whan Son

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This study examined, first, the response of litter decomposition and soil CO2efflux (RS) to different soil moisture conditions and, second, the application of various litter decomposition functions in a wetland and upland forest dominated by Japanese alder. One upland site (US) and three wetland sites - a drained site (DS), poorly drained site (PDS), and surface saturated site (SSS) - were selected based on their variation in soil moisture conditions. Litter mass loss, as determined by a 4-yr litter bag incubation, was applied to Olson's simple exponential function, Berg's asymptotic function, and the rational function. The litter decomposition rate constant (yr-1), which was commonly obtained by the simple exponential function, was highest in PDS (1.181), followed by SSS (0.950), DS (0.922), and US (0.528). The limit value of the litter mass loss, as determined by the asymptotic function was higher in DS (91.7%) and PDS (89.0%) than in SSS (76.9%) and US (70.5%). The rational function provided the most precise fitting of the litter mass loss pattern with few parameters. Periodic saturation and the higher leaf N content in PDS may enhance litter decomposition compared to constant saturation or drained conditions. The RS(mg C m-2h-1) values, periodically measured using a portable infrared gas analyzer, were ranked in the order US (12.6-355.1) = DS (7.1-324.0) > PDS (5.5-220.9) > SSS (0.0-153.8). More hydric conditions probably reduced the vegetation biomass (in contribution to autotrophic RS) and aerobic microbial activities (in contribution to heterotrophic RS). The RStemperature dependency (Q10) was little affected by soil moisture conditions, ranging from 2.48 to 2.69. It is concluded that the litter decomposition rate and RSwere highest under periodic saturation and under lower soil moisture conditions, respectively.

Original languageEnglish
Pages (from-to)1804-1816
Number of pages13
JournalSoil Science Society of America Journal
Volume78
Issue number5
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Soil Science

Fingerprint Dive into the research topics of 'Soil moisture effects on leaf litter decomposition and soil carbon dioxide efflux in wetland and upland forests'. Together they form a unique fingerprint.

Cite this