Effects of SO2 and NO2 on growth and nitrogen concentrations in lucerne and barrel medic

Frank Murray; Susan Wilson; Ma Qifu

doi:10.1016/0098-8472(94)90053-1

Effects of SO₂ and NO₂ on growth and nitrogen concentrations in lucerne and barrel medic

Frank Murray, Susan Wilson, Ma Qifu

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Abstract

This experiment was conducted to determine whether NO₂ influences the effects of SO₂ on growth of two legumes (barrel medic and lucerne). Plants were exposed to <5, 55, 149 or 262 nl l^-1 of SO₂, and <5 or 170 nl l^- of NO₂ for 4 hr day^-1 for 108 days in a factorial experiment using outdoor open-top chambers. NO₂ halved shoot dry weight and had smaller effects on stem length and shoot nitrogen concentration in both species. SO₂ significantly decreased shoot weight and stem length at the higher concentrations. In addition, mixtures of NO₂ and moderate SO₂ concentrations had more severe effects on growth parameters than either SO₂ or NO₂ alone, and exceeded the sum of their independent effects.

Original language	English
Pages (from-to)	319-328
Number of pages	10
Journal	Environmental and Experimental Botany
Volume	34
Issue number	3
DOIs	https://doi.org/10.1016/0098-8472(94)90053-1
Publication status	Published - Jul 1994

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title = "Effects of SO2 and NO2 on growth and nitrogen concentrations in lucerne and barrel medic",

abstract = "This experiment was conducted to determine whether NO2 influences the effects of SO2 on growth of two legumes (barrel medic and lucerne). Plants were exposed to <5, 55, 149 or 262 nl l-1 of SO2, and <5 or 170 nl l- of NO2 for 4 hr day-1 for 108 days in a factorial experiment using outdoor open-top chambers. NO2 halved shoot dry weight and had smaller effects on stem length and shoot nitrogen concentration in both species. SO2 significantly decreased shoot weight and stem length at the higher concentrations. In addition, mixtures of NO2 and moderate SO2 concentrations had more severe effects on growth parameters than either SO2 or NO2 alone, and exceeded the sum of their independent effects.",

keywords = "air pollution, barrel medic, growth, lucerne, nitrogen dioxide, Sulfur dioxide",

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AU - Wilson, Susan

AU - Qifu, Ma

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N2 - This experiment was conducted to determine whether NO2 influences the effects of SO2 on growth of two legumes (barrel medic and lucerne). Plants were exposed to <5, 55, 149 or 262 nl l-1 of SO2, and <5 or 170 nl l- of NO2 for 4 hr day-1 for 108 days in a factorial experiment using outdoor open-top chambers. NO2 halved shoot dry weight and had smaller effects on stem length and shoot nitrogen concentration in both species. SO2 significantly decreased shoot weight and stem length at the higher concentrations. In addition, mixtures of NO2 and moderate SO2 concentrations had more severe effects on growth parameters than either SO2 or NO2 alone, and exceeded the sum of their independent effects.

AB - This experiment was conducted to determine whether NO2 influences the effects of SO2 on growth of two legumes (barrel medic and lucerne). Plants were exposed to <5, 55, 149 or 262 nl l-1 of SO2, and <5 or 170 nl l- of NO2 for 4 hr day-1 for 108 days in a factorial experiment using outdoor open-top chambers. NO2 halved shoot dry weight and had smaller effects on stem length and shoot nitrogen concentration in both species. SO2 significantly decreased shoot weight and stem length at the higher concentrations. In addition, mixtures of NO2 and moderate SO2 concentrations had more severe effects on growth parameters than either SO2 or NO2 alone, and exceeded the sum of their independent effects.

KW - air pollution

KW - barrel medic

KW - growth

KW - lucerne

KW - nitrogen dioxide

KW - Sulfur dioxide

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JO - Environmental and Experimental Botany

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SN - 0098-8472

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Effects of SO₂ and NO₂ on growth and nitrogen concentrations in lucerne and barrel medic

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