Effects of soil water and nitrogen on growth and photosynthetic response of Manchurian ash (Fraxinus mandshurica) seedlings in northeastern China.

PloS One
Miao WangGuanhua Dai

Abstract

Soil water and nitrogen (N) are considered to be the main environmental factors limiting plant growth and photosynthetic capacity. However, less is known about the interactive effects of soil water and N on tree growth and photosynthetic response in the temperate ecosystem. We applied N and water, alone and in combination, and investigated the combined effect of different water and N regimes on growth and photosynthetic responses of Fraxinus mandshurica seedlings. The seedlings were exposed to three water regimes including natural precipitation (CK), higher precipitation (HW) (CK +30%) and lower precipitation (LW) (CK -30%), and both with and without N addition for two growing seasons. We demonstrated that water and N supply led to a significant increase in the growth and biomass production of the seedlings. LW treatment significantly decreased biomass production and leaf N content, but they showed marked increases in N addition. N addition could enhance the photosynthetic capability under HW and CK conditions. Leaf chlorophyll content and the initial activity of Rubisco were dramatically increased by N addition regardless of soil water condition. The positive relationships were found between photosynthetic capacity, leaf N con...Continue Reading

References

May 1, 1996·Biochemical Society Transactions·H C TowleH M Shih
Jan 5, 2002·Tree Physiology·Charles R Warren, Mark A Adams
Oct 12, 2004·Journal of Experimental Botany·M M Chaves, M M Oliveira
Feb 26, 2008·Plant Physiology and Biochemistry : PPB·Inger Andersson, Anders Backlund
May 16, 2009·Science·Josep PeñuelasIolanda Filella
Aug 13, 2009·Plant, Cell & Environment·Lisa D PatrickDavid T Tissue
May 31, 2011·American Journal of Botany·Diane R CampbellSteven E Travers

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