Biomass allocation and nitrogen limitation in a Cryptomeria japonica plantation chronosequence |
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Authors: | Ryunosuke Tateno Keitaro Fukushima Reiji Fujimaki Tetsuya Shimamura Masami Ohgi Hirotsugu Arai Nobuhito Ohte Naoko Tokuchi Takahito Yoshioka |
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Affiliation: | (1) Research Institute for Humanity and Nature, 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan;(2) Graduate School of Agriculture, Kyoto University, Kyoto 6068502, Japan;(3) Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan;(4) Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan;(5) Graduate School of Agriculture and Agricultural Life Sciences, Tokyo University 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;(6) Field Science Education and Research Center, Kyoto University, Kyoto 6068502, Japan;(7) Present address: Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan |
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Abstract: | We investigated soil net nitrogen mineralization rate, above- and belowground biomass allocation, and nitrogen use in a Cryptomeria japonica plantation chronosequence. Total biomass accumulation showed an asymptotic accretion pattern, and the peak total biomass accumulation rate occurred approximately 30 years after afforestation. Soil net nitrogen mineralization rate was lowest 30 years after afforestation. Between years 30 and 88, net nitrogen mineralization increased again. These results indicate that an imbalance in soil nitrogen supply and plant nitrogen demand occurred approximately 30 years after afforestation. Furthermore, leaf nitrogen concentration, which was used as an index of plant nitrogen status, was lower in mature forest than in young forest, suggesting that mature stands did not take up nitrogen as successfully. If soil resources such as nitrogen limit plant growth, plants may increase biomass allocation to fine root structure; however, fine root biomass was not higher in 30- and 88-year-old stands than in younger stands, suggesting that changes in biomass allocation may not be effective against nitrogen deficiency in a C. japonica plantation chronosequence. |
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