Seasonal change in soil nitrogen mineralization in young Chamaecyparis obtusa stands at the upper and lower positions on a slope in central Japan

doi:10.3832/ifor4710-018

Seasonal change in soil nitrogen mineralization in young Chamaecyparis obtusa stands at the upper and lower positions on a slope in central Japan

Nanae Hosokawa^(1-2) , Sasa Tajima⁽²⁾, Hajime Kobayashi⁽³⁾, Keizo Hirai⁽⁴⁾

iForest - Biogeosciences and Forestry, Volume 18, Issue 4, Pages 197-201 (2025)
doi: https://doi.org/10.3832/ifor4710-018
Published: Jul 20, 2025 - Copyright © 2025 SISEF

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Nitrogen (N) is a critical element for tree growth in forest ecosystems. As trees absorb inorganic N, the soil N mineralization process is a key process for their development. Although the spatial pattern of soil N mineralization is expected to relate to tree growth, the difference between the upper and lower positions within a small-scale slope is unclear. Therefore, we compared annual and seasonal soil N mineralization rates in Japanese cypress (Chamaecyparis obtusa [Siebold & Zucc.] Endl.), which stands at both the upper and lower positions on a slope. We used the resin-core method to estimate in situ soil N mineralization rates. Additionally, the litter decomposition rate and inorganic N passed through the litter layer, which are primary sources for soil N mineralization, were investigated using the litter bag and resin-core methods. Our findings revealed that the annual soil N mineralization rate at the lower position was 5 times higher than that at the upper position. Moreover, seasonal variations in soil N mineralization rate tended to be higher at the lower position than at the upper position. The temporal change in input ammonium passed through the litter layer was similar to that of the nitrification rate in the soil at the lower position, except for winter. Notably, high nitrification in winter at the lower position may be related to soil frost, which can accelerate the decomposition of organic matter. Despite these differences, the litter decomposition rate was similar between the slope positions. The higher soil N mineralization rate and substrate input may result in higher tree growth at the lower position on a slope.

Keywords

Soil Nitrogen Mineralization, Field Soil Incubation, Chamaecyparis obtusa, Resin Core Method

Authors’ address

(1)

0000-0003-2336-0570
Shikoku Research Center, Forestry and Forest Products Research Institute, 2-915 Asakuranishi, Kochi-shi, Kochi, 780-8077 (Japan)

(2)

0000-0003-2336-0570

Division of Forest and Environmental Symbiosis Science, Faculty of Agriculture, Shinshu University, Nagano 399-4511 (Japan)

(3)

Education and Research Center of Alpine Field Science, Shinshu University, Nagano 399-4511 (Japan)

(4)

0000-0001-6382-1883
Department of Forest Soils, Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687 (Japan)

Corresponding author

Nanae Hosokawa
nhosokawa@ffpri.affrc.go.jp

Citation

Hosokawa N, Tajima S, Kobayashi H, Hirai K (2025). Seasonal change in soil nitrogen mineralization in young Chamaecyparis obtusa stands at the upper and lower positions on a slope in central Japan. iForest 18: 197-201. - doi: 10.3832/ifor4710-018

Academic Editor

Claudia Cocozza

Paper history

Received: Aug 19, 2024
Accepted: May 06, 2025

First online: Jul 20, 2025
Publication Date: Aug 31, 2025
Publication Time: 2.50 months

Open Access

This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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