Biometric-based estimation of net ecosystem production in a mature Japanese cedar (<Emphasis Type="Italic">Cryptomeria japonica</Emphasis>) plantation beneath a flux tower |
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Authors: | Yuichiro Yashiro Na-Yeon M Lee Toshiyuki Ohtsuka Yoko Shizu Taku M Saitoh Hiroshi Koizumi |
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Institution: | (1) River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;(2) Department of Environmental Science and Ecological Engineering, Korea University, Anam-Dong, SeongBuk-Gu, Seoul, 136-701, Korea;(3) Department of Biology, Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan |
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Abstract: | Quantification of carbon budgets and cycling in Japanese cedar (Cryptomeria japonica D. Don) plantations is essential for understanding forest functions in Japan because these plantations occupy about 20% of
the total forested area. We conducted a biometric estimate of net ecosystem production (NEP) in a mature Japanese cedar plantation
beneath a flux tower over a 4-year period. Net primary production (NPP) was 7.9 Mg C ha−1 year−1 and consisted mainly of tree biomass increment and aboveground litter production. Respiration was calculated as 6.8 (soil)
and 3.3 (root) Mg C ha−1 year−1. Thus, NEP in the plantation was 4.3 Mg C ha−1 year−1. In agreement with the tower-based flux findings, this result suggests that the Japanese cedar plantation was a strong carbon
sink. The biometric-based NEP was higher among most other types of Japanese forests studied. Carbon sequestration in the mature
plantation was characterized by a larger increment in tree biomass and lower mortality than in natural forests. Land-use change
from natural forest to Japanese cedar plantation might, therefore, stimulate carbon sequestration and change the carbon allocation
of NPP from an increment in coarse woody debris to an increase in tree biomass. |
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