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FOREST RESOURCES WANAGEMENT ›› 2010, Vol. 0 ›› Issue (2): 89-93.

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Effects of Nitrogen and Phosphorus on Growth and Photosynthesis of Pithecellobium dulce Seedlings

LI Dongsheng1, CHEN Jin2, FENG Qiuhong2, SHI Zuomin2   

  1. 1. Academy of Forest Inventory and Planning, State Forestry Administration, Beijing 100714, China;
    2. Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest Ecology and Environmental Sciences of State Forestry Administration, Beijing 100091, China
  • Received:2010-03-15 Revised:2010-03-30 Published:2020-12-14

Abstract: Effects of nitrogen and phosphorus on growth and photosynthesis of Pithecellobium dulce (an introduced species) seedlings were studied.The results showed that P.dulce was able to acclimate to a wide range of nitrogen and phosphorus environment.With an increase in nitrogen level,the ratio of root mass to total mass and root mass to overground mass of the seedlings significantly decreased.Under a wide range of nitrogen level,their total biomass significantly increased,but decreased significantly at over 0.1g·kg-1soil nitrogen level.With an increase in phosphorus level,the ratio of root mass to total mass and root mass to overground mass of the seedlings decreased,but the total biomass significantly increased.No matter with an increase in nitrogen level or with an increase in phosphorus level,the specific leaf area (SLA) of the seedlings increased and their height,leaf nitrogen content,leaf phosphorus content,net photosynthetic rate also significantly increased.

Key words: Pithecellobium dulce, nitrogen,phosphorus, growth characteristics, photosynthesis

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