An introduction to the Canadian Intersite Decomposition Experiment

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  • Osono Takashi
    Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University

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  • カナダにおけるリター分解の地域間比較 : CIDETプロジェクトの成果と課題
  • カナダ ニ オケル リター ブンカイ ノ チイキカン ヒカク CIDET プロジェクト ノ セイカ ト カダイ

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Abstract

The experimental design and main results of the Canadian Intersite Decomposition Experiment (CIDET) are described. A total of 37 litter types, including coniferous and broad-leaved foliage, were collected from Canadian sites. The nutrient content was determined, and the litter was analyzed for proximate organic chemical constituents, using solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Of the litter types, 11 (10 foliage species: Thuja plicata, Fagus grandifolia, Larix laricina, Pseudotsuga menziesii, Pinus banksiana, Populus tremuloides, Picea mariana, Betula papyrifera, Pteridium aquilinum, Festuca hallii; and one wood species: Tsuga heterophylld) were used in long-term, litterbag-method decomposition experiments at 21 sites (18 upland forest and 3 wetland sites) located in major Canadian ecoclimatic regions. The mean annual temperatures of the 21 sites ranged from - 9.8℃ to 9.3℃ and the annual precipitation from 266 to 1783 mm. Results have been published on changes in the remaining litter mass over a 6-year decomposition period and on nitrogen and phosphorus dynamics during decomposition. Empirical multiple regression models and a mechanistic model (Forest Litter Decomposition Model; FLDM) have been proposed to estimate decomposition rates and nitrogen dynamics, using climate and litter quality variables.

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