低浓度二氧化硫长期暴露对作物生产力的影响

本文报道低浓度 SO_2长期暴露对我国主栽作物生产力的影响。试验结果表明,0.1mg/m~3SO_2长期暴露即可对供试作物水稻、小麦、玉米、大豆、马铃薯、白菜的产量产生一定程度的影响。0.25mg/ m~3SO_2可使供试作物较大幅度减产。根据实验结果推算,敏感作物减产阈值浓度为0.03～0.05mg/m~3,中度敏感作物为0.07mg/m~3,抗性作物为0.09～0.17mg/m~3。引起禾谷类作物和大豆减产的主要原因是结实率降低。对于物质积累的影响较小。供试作物减产幅度与叶片伤害程度之间无相关关系。

Effects of at Sulfur Dioxide Low-Concentration on Productivity of Crops in Long-Term Exposure

This paper reports the research results of effects SO₂ of at low-concentration on productivity of the crops in long-term exposure in the open-top chamber. The results show that0.1mg/m³ SO₂ can reduce yield of rice, wheat corn, soybean, potato. and Chinese Cabbage in long-term exposure. There is a more significant decrease in yield of theexperimental crops at 0.25mg/ m³ SO₂. The SO₂ threshold concentration of reducing yield for the sensitive crops is 0.03-0.05mg/ m³, 0.07mg/ m³ for the moderate sensitive crops, and 0.09-0.17mg/m³ for the resistant crops. The decrease of bearing is a main cause of reducing yield for rice, wheat, corn and saybean. There is nota significant effect on accumulation of dry matter. The reducing yield of the experimental crops don''t directly relate to leaf injury.