Abstract
Within a forested watershed at the Uryu Experimental Forest of Hokkaido University in northern Hokkaido, overstory litterfall and related nutrient fluxes were measured at different landscape zones over two years. The wetland zone covered with Picea glehnii pure stand. The riparian zone was deciduous broad-leaved stand dominated by Alnus hirsuta and Salix spp., while the mixture of deciduous broadleaf and evergreen conifer dominated by Betula platyphylla, Quercus crispula and Abies sachalinensis distributed on the upland zone. Annual litterfall averaged 1444, 5122, and 4123 kg·hm−2·a−1 in the wetland, riparian and upland zones, respectively. Litterfall production peaked in September–October, and foliage litter contributed the greatest amount (73.4%–87.6 %) of the annual total litterfall. Concentrations of nutrients analyzed in foliage litter of the dominant species showed a similar seasonal variation over the year except for N in P. glehnii and A. hirsuta. The nutrient fluxes for all elements analyzed were greatest on riparian zone and lowest in wetland zone. Nutrient fluxes via litterfall followed the decreasing sequence: N (11–129 kg·hm−2·a−1) > Ca (9–69) > K (5–20) > Mg (3–15) > P (0.4–4.7) for all stands. Significant differences were found in litterfall production and nutrient fluxes among the different landscape components. There existed significant differences in soil chemistry between the different landscape zones. The consistently low soil C:N ratios at the riparian zone might be due to the higher-quality litter inputs (largely N-fixing alder).
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Foundation project: The project was supported by Japanese Society for Promotion of Sciences (15P03118).
Biography: XU Xiao-niu (1961–), corresponding author, male, Ph. D., Prof. in College of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China
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Xu, Xn., Shibata, H. Landscape patterns of overstory litterfall and related nutrient fluxes in a cool-temperate forest watershed in northern Hokkaido, Japan. J. For. Res. 18, 249–254 (2007). https://doi.org/10.1007/s11676-007-0051-7
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DOI: https://doi.org/10.1007/s11676-007-0051-7