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《Chinese Journal of Oil Crop Sciences》 2008-02
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Effect of SO_4~(2-) in simulated acid rain on growth and quality of rapeseed

ZHENG You-fei,LI Lu,LIANG Jun,LI Hong-shuang,MAI Bo-ru(College of Environment Science and Engineering,Nanjing University of Information & Technology,Nanjing 210044,China)  
The effect of SO42-in a simulated acid rain on growth and quality of rapeseeds was studied in rapeseed field.The result showed that plant height and leaf area of the rapeseed increased when pH4.0,with the peak value appearing in pH5.0.The plant height and leaf area decreased sharply when the pH value of simulated acid rain getting lower.The concentration of chlorophyll notably decreased with the lower pH value,with 59.06% in average.Chlorophyll-a had a positive correlation with pH value of acid rain and was more likely to be influenced by the acid rain than the chlorophyll-b,especially when pH3.0.Yield increases when pH4.0 which may attribute to the SO42-supply and decrease under intensive stress of the acid rain.However,the simulated acid rain seemed have less effect on the thousand grain weight.Under the effect of the acid rain,the concentration of crude lipid,crude protein,soluble saccharide and reductive saccharide decreased significantly with lower pH value,especially when pH3.0.However,the concentration of soluble amino acid under different treatment had a notable increase,but showed no linear correlation with the pH and SO42-variation in the simulated acid rain.The total acidity had a 2-stage linear correlation with the pH value.The pH 3.0 of the acid rain can be considered as a threshold,and below which the growth would be restrained and quality of the seeds would be undermined.
【Fund】: 江苏省“333”工程资助项目(2219#)
【CateGory Index】: S565.4
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