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- Title
Effects of ozone exposure on sub-tropical evergreen Cinnamomum camphora seedlings grown in different nitrogen loads.
- Authors
Zhaozhong Feng; Junfeng Niu; Weiwei Zhang; Xiaoke Wang; Fangfang Yao; Yuan Tian
- Abstract
The present study aims in investigating the individual and combined effects of ozone (O) exposure and nitrogen (N) load on the growth and photosynthetic characters of Cinnamomum camphora seedlings, a dominant evergreen broadleaf tree species in sub-tropical regions. The seedlings were supplied with N as NHNO solution at 0, 30 and 60 kg ha year (simplified as N0, N30, N60, respectively) and were exposed to ambient O concentration (AA) or elevated [O] (E-O, AA +60 ppb) for one growth season. E-O induced significant negative effects on foliar photosynthesis, including lower photosynthetic rate, reduced carboxylation efficiency, quantum yield of PSII and photosynthetic pigment contents, despite no effect on growth. In contrast, N load acted as fertilization effects. Medium N (N30) increased photosynthetic pigments and stem-base diameter growth relative to N0, whereas high N load (N60) significantly enhanced the growth, photosynthetic pigments, and dark and light action of photosynthesis of C. camphora seedlings. No significant interactive effects of O and N load on the growth, net photosynthetic rate and pigment contents of the seedlings were found, suggesting that N supply to the soil at ≤60 kg ha year does not significantly change the sensitivity of C. camphora to ozone.
- Subjects
CINNAMON tree; OZONE; GAS exchange in plants; SEEDLINGS; PHOTOSYNTHESIS; GRISELINIA littoralis
- Publication
Trees: Structure & Function, 2011, Vol 25, Issue 4, p617
- ISSN
0931-1890
- Publication type
Article
- DOI
10.1007/s00468-011-0538-x