Impact of aqueous extracts of Cinnamomum septentrionale leaf litter on the growth and photosynthetic characteristics of Eucalyptus grandis seedlings

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• 作者：Weiwei Huang ; Hongling Hu ; Tingxing Hu ; Hong Chen ; Qian Wang ; Gang Chen…
• 关键词：Cinnamomum septentrionale ; Eucalyptus grandis ; Allelopathy ; Photosynthetic rate ; Photosynthetic response to PPFD and C i ; Chlorophyll ; Growth
• 刊名：New Forests
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：46
• 期：4
• 页码：561-576
• 全文大小：488 KB
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• 作者单位：Weiwei Huang (1)
  Hongling Hu (1)
  Tingxing Hu (1)
  Hong Chen (1)
  Qian Wang (1)
  Gang Chen (1)
  Lihua Tu (1)
  
  1. Key Laboratory of Forestry Ecological Engineering of Sichuan Province, College of Forestry, Sichuan Agricultural University, Ya’an, 625014, Sichuan, People’s Republic of China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Forestry
  
• 出版者：Springer Netherlands
• ISSN：1573-5095

文摘

The effects of C. septentrionale leaf litter aqueous extracts (CLAE; controls: 0?g?pot?, A₁: 40?g?pot?, A₂: 80?g?pot?, A₃: 120?g?pot?) on seedling growth, chlorophyll content and photosynthesis of Eucalyptus grandis Hill ex Maid were examined. The CLAE at 80 or 120?g?pot? significantly decreased net photosynthetic rate (P _n), transpiration rate (T _r) and intercellular CO₂ concentration (C _i), followed by a reduction of relative height growth and basal diameter growth. Under light saturation, apparent quantum yield, light-saturated photosynthetic rate (P _{n max}) in all treated groups and light respiration (R _d) in A₁ and A₂ showed a decreasing trend, whereas light compensation point and light saturation point had an increased tendency. Under CO₂ concentration saturation, carboxylation rate, P _{n max} and light respiration (R _p) first increased (A₁) and dramatically decreased (A₂ and A₃) thereafter, whereas CO₂ compensation point and CO₂ saturation point increased. However, all parameters of the chlorophyll content of E. grandis seedlings were found to decrease with increased concentrations of CLAE. The results demonstrate that the aqueous extracts from C. septentrionale leaf litter have allelopathic potential and that a higher concentration of CLAE presents a risk or disadvantage to the growth of E. grandis seedling which suggests that the growth of E. grandis seedlings could be inhibited when planted under or near mature C. septentrionale plantation, and it is better not to develop mixed-plantation of C. septentrionale and E. grandis.