Photosynthesis and water use characteristics of Cinnamomum camphora seedlings with simulated acid rain
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摘要: 选择亚热带地区重要特种经济树种樟树Cinnamomum camphora为研究对象。通过盆栽试验,研究了不同梯度下的酸雨在不同季节对3年生樟树幼苗的净光合速率(Pn),气孔导度(Gs),蒸腾速率(Tr),水分利用率(EWU)等生理参数的影响。结果显示,樟树幼苗的净光合速率、气孔导度、蒸腾速率和水分利用率随酸雨强度、季节和年份的不同均产生显著变化。酸雨处理的初期,中等强度的酸雨(pH 4.0)提高了樟树幼苗的净光合速率与气孔导度。在2008和2009年秋季的处理中,净光合速率和蒸腾速率在不同强度酸雨影响下表现为pH 4.0>pH 5.6>pH 2.5。樟树幼苗的水分利用率在夏季随酸雨强度的增加而变大,但在秋季无明显变化。酸雨、季节和年份的单独作用、两两交互作用,酸雨+季节+年份三者的交互作用对樟树幼苗的光合速率、气孔导度、蒸腾速率和水分利用效率均有影响。其中酸雨+季节对樟树幼苗的气孔导度影响不显著(P>0.05),但对净光合速率、蒸腾速率和水分利用率的影响显著(P<0.05)。图4表1参27Abstract: To study the physiological characteristics of water in Cinnamomum camphora seedlings with acid rain treatments, a three-year pot experiment was conducted on photosynthetic rate (Pn),stomata conductance (Gs),transpiration rate (Tr),and water use efficiency (WUE) for simulated acid rain treatments of pH 2.5 (severe) and pH 4.0 (moderate) with water (pH 5.6) as the control. Results showed that acid rain significantly affected Pn,Gs,Tr and WUE. In the initial stage of treatment,acid rain of pH 4.0 positively affected the photosynthetic rate Pn and Gs. In the autumn of year two,Pn and Tr were greatest with acid rain treatments in the order of pH 4.0 > pH 5.6 > pH 2.5. WUE in summer increased as pH increased,but not in autumn. Season,year,acid rain,interactions of season and year,and interactions of the three factors were significant for Pn,Gs,Tr and WUE. The interaction of acid rain and season on stomata conductance (Gs) was not significant (P > 0.05) but was significant (P < 0.01) for Tr,Pn and WUE.[Ch,4 fig. 1 tab. 27 ref.]
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Key words:
- forest ecology /
- imulated acid rain /
- Cinnamomum camphora /
- seedlings /
- photosynthesis /
- water use efficiency
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2013.02.004
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