Journal
CANADIAN JOURNAL OF FOREST RESEARCH
Volume 42, Issue 7, Pages 1395-1403Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/X2012-091
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Funding
- Ministry of Education, Culture and Science, Japan [14380244, 23570030]
- Nissan Science Foundation
- Grants-in-Aid for Scientific Research [23570030, 14380244] Funding Source: KAKEN
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To investigate the direct physiological effects of CNU (canopy nitrogen uptake), three mist solutions (control, N-1, and N-2 with 0.03, 13.1, and 32.7 kg NH4+-N.ha(-1), respectively) were sprayed on Japanese red pine (Pinus densiflora Sieb. et Zucc.) seedlings three times a week for three months. Waterproof sheets protected the surface soil during misting to avoid adding N to the soil. The results show N mist treatments to foliage increased needle N availability in proportion to N dose, which was large enough to cause greater N and chlorophyll content in the needles. This suggests that N is rapidly absorbed, is directly assimilated by the needles, and is used in photosynthesis. These increases resulted in higher maximum net CO2 assimilation rates (A(max)) and maximum quantum yield of PSII photochemistry (F-v/F-m) of pine seedlings and subsequently increased bud and root biomass. Increased root biomass reduced the sensitivity of the shoot-to-root ratio to increased N availability in the foliage. In conclusion, our study supported the idea that CNU should be taken into consideration when evaluating the impacts of elevated atmospheric N deposition on forest C sequestration and biomass allocation.
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