Proton Budget for a Japanese Cedar Forest Ecosystem
Source: Water, Air, and Soil Pollution, Volume 130, Numbers 1-4, August 2001 , pp. 721-726(6)
Abstract:The proton budget for a Japanese cedar (Cryptomeria japonica) forest in Gunma Prefecture, Japan, was studied by estimating biogeochemical fluxes. The proton budgets were estimated for three individual compartments of the ecosystem: vegetation canopy, and the upper (O horizon + 0–10 cm) and lower (10–100 cm) soil layers. The dominant proton sources in the compartments were atmospheric deposition (1.2 kmol ha^−1 yr^−1), nitrification (5.1 kmol, ha^−1 yr^−1) and base-cation uptake by vegetation (8.0 kmol, ha^−1 yr^−1) respectively. These proton sources were neutralized almost completely within the individual compartments mainly by base-cation release from the canopy or the soil. The sum of internal proton sources was five times as large as that of external ones. Nitrogen input from the atmosphere was 2.2 kmol ha^−1 yr^−1, whereas its output from the lower soil layer was 3.9 kmol ha^−1 yr^−1, indicating that a net loss of nitrogen occurred in the ecosystem. However, this did not cause the acidification of soil leachates because of a sufficient release rate of base cations from the soil.
Document Type: Regular Paper
Affiliations: 1: Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwado-kita, Komae, Tokyo 201-8511, Japan e-mail:email@example.com 2: Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwado-kita, Komae, Tokyo 201-8511, Japan 3: North Research Station, Hokkaido University Forests, Faculty of Agriculture, Hokkaido University, 250 Aza-Tokuda, Nayoro 096-0071, Japan
Publication date: August 1, 2001