Field measurement of N2O flux from soybean plant and effect of light on it

Abstract

Abstract: The N₂O flux from soybean plant measured by closed chamber method under field condition shows that there exist two peaks of N₂O emission at soybean's seedling and flowering stages,respectively. The general pattern of diurnal variation in N₂O flux from soybean plant is an emission peak in the morning and a valley in the afternoon,which is not altered by fertilization.The average N₂O emission rates are 2.27 and 1.28 μgN₂Om^-2 ·h^-1 for fertilized and control plots,respectively. Soybean plant has a lower N₂O flux under strong light condition (in the level of 10⁴lx), even absorbing the atmospheric N₂O.But under weak light condition (in the level of 10³～10²lx),N₂O flux from soybean plant is higher.

Key words: Soybean plant, N₂O flux, Light, soil-vegetable system, transfer function, risk threshold, species sensitivity distribution, Cd contamination

Yu Kewei, Huang Bin, Chen Guanxiong, Wu Jie . Field measurement of N₂O flux from soybean plant and effect of light on it[J]. Chinese Journal of Applied Ecology, 1997, 8(2): 171-176.

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Field measurement of N₂O flux from soybean plant and effect of light on it

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