Ecological Research

, Volume 25, Issue 5, pp 1033–1044 | Cite as

Spatial and temporal patterns of soil respiration over the Japanese Archipelago: a model intercomparison study

Original Article

Abstract

We used terrestrial ecosystem models to estimate spatial and temporal variability in and uncertainty of estimated soil carbon dioxide (CO2) efflux, or soil respiration, over the Japanese Archipelago. We compared five carbon-cycle models to assess inter-model variability: Biome-BGC, CASA, LPJ, SEIB, and VISIT. These models differ in approaches to soil carbon dynamics, root respiration estimation, and relationships between decomposition and environmental factors. We simulated the carbon budget of natural ecosystems over the archipelago for 2001–2006 at 1-day time steps and 2-min (latitude and longitude) spatial resolution. The models were calibrated using measured flux data to accurately represent net ecosystem CO2 exchange. Each model successfully reproduced seasonal changes and latitudinal gradients in soil respiration. The five-model average of estimated total soil respiration of Japanese ecosystems was 295 Tg C year−1, with individual model estimates ranging from 210 to 396 Tg C year−1 (1 Tg = 1012 g). The differences between modeled estimates were more evident in summer and in warmer years, implying that they were mainly attributable to differences in modeling the temperature dependence of soil respiration. There was a large discrepancy between models in the estimated contribution of roots to total soil respiration, ranging from 3.9 to 48.4%. Although model calibration reduced the uncertainty of flux estimates, substantial uncertainties still remained in estimates of underground processes from these terrestrial carbon-cycle models.

Keywords

Carbon cycle Forest ecosystem Global warming Model simulation Uncertainty Underground process 

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Copyright information

© The Ecological Society of Japan 2010

Authors and Affiliations

  1. 1.National Institute for Environmental StudiesTsukubaJapan
  2. 2.Faculty of Symbiotic Systems ScienceFukushima UniversityFukushimaJapan
  3. 3.QUEST, Department of Earth ScienceUniversity of BristolBristolUK

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