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Spatiotemporal Variation in N₂O Flux within a Slope in a Japanese Cedar (Cryptomeria japonica) Forest

Kazuya Nishina, Chisat Takenaka and Shigehiro Ishizuka
Biogeochemistry
Vol. 96, No. 1/3 (Dec., 2009), pp. 163-175
Published by: Springer
Stable URL: http://www.jstor.org/stable/40343750
Page Count: 13
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Spatiotemporal Variation in N₂O Flux within a Slope in a Japanese Cedar (Cryptomeria japonica) Forest
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Abstract

Topographic factors affect nitrogen cycling in forest soils, including nitrous oxide (N₂O) emissions, which contribute to the greenhouse effect. We measured the N₂O flux at 14 chambers placed along a 65-m transect on a slope for 1 year at 2-to 3-week intervals. We applied a hierarchical Bayesian model with a conditional autoregressive (CAR) model to assess the spatiotemporal N₂O flux along a slope and quantify the effects of environmental factors on N₂O emissions. N₂O fluxes at chambers located at lower positions along the slope were relatively greater than those at higher positions. During the non-soilfreezing period, N₂O fluxes fluctuated seasonally depending on soil temperature. The soil temperature dependency of N₂O fluxes at each chamber increased with descending slope position (the median of the Q₁₀ equivalent simulated from posterior distribution ranged from 1.18 to 3.64). According to the Bayesian hierarchical model, this trend could be partially explained by the C/N ratio at each chamber position. During the soil-freezing period, relatively high N₂O fluxes were observed at lower positions along the slope.

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