Relationship between light-saturated photosynthesis and leaf nitrogen content was studied in Cryptomeria japonica D. Don saplings growing under different light and nitrogen supply. Both light-saturated photosynthesis per area (Pmax-area) and leaf nitrogen per area (Narea) increased with increasing light and nitrogen supply. Pmax-area was highly positively correlated with Narea. The slope of the linear regression between Pmax-area and Narea was 1.67 μmol CO2 g N-1 s-1, which was low compared to that for other conifer trees previously described. Light-saturated photosynthesis per mass (Pmax-mass) did not increase with increased light, but increased with increasing nitrogen supply. Pmax-mass was also positively correlated with leaf nitrogen per mass (Nmass), but the correlation coefficient was low. Since Pmax-area was highly correlated with Narea regardless of whether variation in Narea was due to light or nitrogen supply, this suggested that Narea would be a good index of photosynthesis in Cryptomeria japonica.
|Number of pages||4|
|Journal||Nihon Ringakkai Shi/Journal of the Japanese Forestry Society|
|Publication status||Published - Jan 1 2002|
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