Effects of patch cutting on leaf nitrogen nutrition in hinoki cypress (Chamaecyparis obtusa Endlicher) at different elevations along a slope in Japan |
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| Authors: | Asami Nakanishi Yoshiyuki Inagaki Naoya Osawa Shozo Shibata Kei’ichi Hirata |
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| Institution: | (1) Kamigamo Experimental Station, Field Science Education and Research Center, Kyoto University, 2 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan;(2) Forestry and Forest Product Research Institute, 1 Matsunosato, Tsukuba 305-8687, Japan;(3) Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan;(4) Field Science Education and Research Center, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan |
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| Abstract: | Leaf nitrogen nutrition of hinoki cypress (Chamaecyparis obtusa Endlicher) was investigated at three positions along a slope over a period of 3 years. At each slope position, nitrogen properties
were compared in patch-cut plots (0.06–0.09 ha) and uncut control plots (0.04 ha). Nitrogen cycling at the lower slope was
characterized by a higher rate of soil nitrogen mineralization, and higher nitrogen concentration in fresh leaves and leaf-litter.
The soil nitrogen mineralization rate and fresh-leaf nitrogen concentration in the patch-cut plots were higher than those
in the control plots. However, leaf-litter nitrogen concentration did not differ between the patch-cut and control plots.
The results suggest that slope position strongly affects leaf nitrogen nutrition of hinoki cypress and soil nitrogen availability.
By contrast, patch cutting does not affect leaf-litter nitrogen concentration. These findings indicated that hinoki cypress
would not enhance forest nitrogen cycling through changes in leaf-litter nitrogen concentration after patch cutting. |
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