Journal of Food, Agriculture and Environment

Effects of applying nitrogen upon photosynthesis characters in Quercus liaotungensis 

Author(s):

Hongbing Bai ^{1, 2}, Faqi Wu ¹*, Yuansheng Li ², Yi Qin ², Min Wu ²

Recieved Date: 2012-07-02, Accepted Date: 2012-10-06

Abstract:

The Cropland Conversion Program (CCP) project in Loess Plateau is a main eco-environment construction project that aims at reducing the sediment yield of The Yellow River and improving local environment. However, the barren soil in this area caused the low productivity of the plant seedlings. Based on this phenomenon, this paper investigates the effects of applying nitrogen upon photosynthesis characters of the 2-year Q.liaotungensis seedlings by testing the photosynthesis indicators in controlled pots. Results show that: (1) applying nitrogen could place significant influence on Q.liaotungensis growth and photosynthesis product distribution, e.g. the most significant increase of the aboveground part biomass is 20.14% and 25.00% higher in leaf and stem than in control pot; (2) applying nitrogen increased both the net photosynthesis rate (Pn) and the maximum Pn, and broadened the growth light intensity of Q.liaotungensis seedlings. Among different concentrations of nitrogen, it was found that the Pn increase became most significant when applying nitrogen at the concentration of 0.10 g/kg. The average increase of the maximum Pn reached 21.8% at this concentration. (3) Reasonable fertilization might have influenced the concentration of leaf nitrogen content and the activity of nitrate reductase which affects abscisic acid (ABA) content and ultimately causes the variation of Tr and Pn of Q.liaotungensis seedlings. The result can be used to guide the soil amelioration process for planting forest in soil barren area, e.g. Loess Plateau, which can also be helpful in providing the theoretical basis for the reasonable and sustainable progress of the CCP project.

Keywords:

Photosynthesis character, applying nitrogen, Q.liaotungensis

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1320-1326

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