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

Abstract

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

CLC Number:

Q945

LI Dongsheng, CHEN Jin, FENG Qiuhong, SHI Zuomin. Effects of Nitrogen and Phosphorus on Growth and Photosynthesis of Pithecellobium dulce Seedlings[J]. FOREST RESOURCES WANAGEMENT, 2010, (2): 89-93.

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