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Forests 2016, 7(4), 78; doi:10.3390/f7040078

Effects of Elevated Ozone on Stoichiometry and Nutrient Pools of Phoebe Bournei (Hemsl.) Yang and Phoebe Zhennan S. Lee et F. N. Wei Seedlings in Subtropical China

1
Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing 100091, China
2
College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editors: Chris A. Maier and Timothy A. Martin
Received: 29 December 2015 / Revised: 25 March 2016 / Accepted: 28 March 2016 / Published: 31 March 2016
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Abstract

Tropospheric ozone (O3) is considered one of the most critical air pollutants in many parts of the world due to its detrimental effects on plants growth. However, the stoichiometric response of tree species to elevated ozone (O3) is poorly documented. In order to understand the effects of elevated ozone on the stoichiometry and nutrient pools of Phoebe bournei (Hemsl.) Yang (P. bournei)and Phoebe zhennan S. Lee et F. N. Wei (P. zhennan), the present study examined the carbon (C), nitrogen (N), and phosphorous (P) concentrations, stoichiometric ratios, and stocks in foliar, stem, and root for P. bournei and P. zhennan with three ozone fumigation treatments (Ambient air, 100 ppb and 150 ppb). The results suggest that elevated ozone significantly increased the N concentrations in individual tissues for both of P. bournei and P. zhennan. On the contrary, elevated ozone decreased the C:N ratios in individual tissues for both of P. bournei and P. zhennan because the C concentration remained stable under the ozone stress. The P concentration, and C:P and N:P ratios in individual tissues for both P. bournei and P. zhennan did not exhibit consistent variation tendency with elevated ozone. Elevated ozone sharply reduced the total C, N, and P stocks and altered the pattern of C, N, and P allocation for both P. bournei and P. zhennan. The present study suggests that tropospheric ozone enrichment should be considered an important environmental factor on stoichiometry of tree species. View Full-Text
Keywords: ozone; stoichiometry; Phoebe bournei; Phoebe zhennan; subtropical China ozone; stoichiometry; Phoebe bournei; Phoebe zhennan; subtropical China
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cao, J.; Shang, H.; Chen, Z.; Tian, Y.; Yu, H. Effects of Elevated Ozone on Stoichiometry and Nutrient Pools of Phoebe Bournei (Hemsl.) Yang and Phoebe Zhennan S. Lee et F. N. Wei Seedlings in Subtropical China. Forests 2016, 7, 78.

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