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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2006, Vol. 7 Issue (4 ): 6-    DOI: 10.1631/jzus.2006.B0283
    
Impact of elevated CO2 concentration under three soil water levels on growth of Cinnamomum camphora
Zhao Xing-Zheng, Wang Gen-Xuan, Shen Zhu-Xia, Zhang Hao, Qiu Mu-Qing
Agro-Ecology Institute, School of Life Sciences, Zhejiang University, Hangzhou 310029, China
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Abstract  Forest plays very important roles in global system with about 35% land area producing about 70% of total land net production. It is important to consider both elevated CO2 concentrations and different soil moisture when the possible effects of elevated CO2 concentration on trees are assessed. In this study, we grew Cinnamomum camphora seedlings under two CO2 concentrations (350 μmol/mol and 500 μmol/mol) and three soil moisture levels [80%, 60% and 40% FWC (field water capacity)] to focus on the effects of exposure of trees to elevated CO2 on underground and aboveground plant growth, and its dependence on soil moisture. The results indicated that high CO2 concentration has no significant effects on shoot height but significantly impacts shoot weight and ratio of shoot weight to height under three soil moisture levels. The response of root growth to CO2 enrichment is just reversed, there are obvious effects on root length growth, but no effects on root weight growth and ratio of root weight to length. The CO2 enrichment decreased 20.42%, 32.78%, 20.59% of weight ratio of root to shoot under 40%, 60% and 80% FWC soil water conditions, respectively. And elevated CO2 concentration significantly increased the water content in aboveground and underground parts. Then we concluded that high CO2 concentration favours more tree aboveground biomass growth than underground biomass growth under favorable soil water conditions. And CO2 enrichment enhanced lateral growth of shoot and vertical growth of root. The responses of plants to elevated CO2 depend on soil water availability, and plants may benefit more from CO2 enrichment with sufficient water supply.

Key words： Cinnamomum camphora      CO2 concentration      Soil moisture      Plant growth      Root to shoot ratio     
Received: 10 August 2005     
CLC:  Q142.9  
  S718.51  
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Zhao Xing-Zheng
Wang Gen-Xuan
Shen Zhu-Xia
Zhang Hao
Qiu Mu-Qing
Cite this article:

Zhao Xing-Zheng, Wang Gen-Xuan, Shen Zhu-Xia, Zhang Hao, Qiu Mu-Qing. Impact of elevated CO2 concentration under three soil water levels on growth of Cinnamomum camphora. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2006, 7(4 ): 6-.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2006.B0283     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2006/V7/I4 /6

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