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Growth and Nitrogen Availability of Red Pine Seedlings under High Nitrogen Load and Elevated Ozone
Authors: Nakaji T.1; Kobayashi T.2; Kuroha M.3; Omori K.3; Matsumoto Y.3; Yonekura T.3; Watanabe K.3; Utriainen J.3; Izuta T.4
Source: Water, Air and Soil Pollution: Focus, Volume 4, Numbers 2-3, June 2004 , pp. 277-287(11)
Publisher: Springer
Abstract:
To evaluate the effect of increasing nitrogen (N) deposition and tropospheric ozone (O3) concentrations on N-saturated forest ecosystems, we investigated the response of Japanese red pine (textit{Pinus densiflora}), an N-saturation sensitive tree species, to increasing N load under elevated O3 concentrations. One-year-old seedlings of red pine were treated with three levels of N supply (0, 50 and 100 mg N L-1 fresh soil volume) under two levels of atmospheric O3 concentration (< 5 and 60 ppb) for two growing seasons. Nitrogen treatment did not stimulate dry matter production of the seedlings. Growth inhibition was observed in the highest N treatment under low O3 and in the two higher N treatments under elevated O3. Irrespective of the O3 concentration, increasing N supply negatively affected root growth and mycorrhizal development in fine roots, resulting in a reduction in P and Mg uptake from the soil. Net photosynthetic rate was significantly reduced by both the highest N treatment under low O3 and the two higher N treatments under elevated O3, together with decreased N-availability to Rubisco. Nitrogen assimilated from NO3- to amino acid in the needles was not affected by the treatments. However, needle protein concentration was reduced by the highest N-treatment under low O3 and by the two higher N-treatments under elevated O3. These results suggest that elevated O3 potentially disturbs the N-availability in the form of protein including Rubisco, and may advance the negative effects of excessive N-deposition on N-sensitive plant species in N-saturated forests.Keywords: nitrogen; nitrogen availability; ozone; photosynthesis; red pine
Document Type: Research article
DOI: http://dx.doi.org/10.1023/B:WAFO.0000028360.61672.8d
Affiliations: 1: Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305–8506, Japan 2: Central Research Institute of Electric Power Industry, Abiko, Chiba 270–1194, Japan 3: Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183–8509, Japan 4: Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183–8509, Japan (author for correspondence, izuta@cc.tuat.ac.jp; phone: +81-42-3675728;, Fax: +81-42-3675728), Email: izuta@cc.tuat.ac.jp
Publication date: 2004-06-01
- In this: publication
- By this: publisher
- In this Subject: Hydraulic & Environmental Engineering
- By this author: Nakaji T. ; Kobayashi T. ; Kuroha M. ; Omori K. ; Matsumoto Y. ; Yonekura T. ; Watanabe K. ; Utriainen J. ; Izuta T.
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