摘要
为探明酸雨对春小麦光合特性的影响,分别用pH值为1.5、2.5、3.5、4.5和5.6的模拟酸雨在春小麦拔节期对其进行喷淋,然后测定不同pH值模拟酸雨处理后春小麦叶片的光合参数。结果表明,酸雨pH值与净光合速率、气孔导度、蒸腾速率、水分利用效率以及叶绿素相对含量均呈极显著正相关,与胞间CO2浓度呈极显著负相关。酸雨使小麦叶片净光合速率下降了4.08%～67.04%,气孔导度下降了17.44%～58.44%,蒸腾速率下降了12.08%～48.08%,胞间CO2浓度上升了9.01%～14.29%,叶绿素相对含量下降了12.16%～37.23%。模拟酸雨处理后,春小麦叶片净光合速率与气孔导度、蒸腾速率、水分利用效率和叶绿素相对含量呈极显著正相关,与胞间CO2浓度呈极显著负相关。蒸腾速率与气孔导度、水分利用效率和叶绿素相对含量均呈极显著正相关,与胞间CO2浓度呈极显著的负相关。酸雨对春小麦叶片光合特性的影响随酸雨的氢离子浓度增大而愈显著。
In order to investigate the effect of acid rain on photosynthetic characteristics of spring wheat,spring wheat at the jointing stage was sprayed with simulated acid rain at different pH levels of 1.5,2.5,3.5,4.5 and 5.6,and then,the yield and the photosynthetic parameters of spring wheat leaves were monitored.The results indicated the pH value of simulated acid rain was significantly positively correlated with net photosynthetic rate,stomatal conductance,transpiration rate,water use efficiency and the relative chlorophyll content,whereas was significantly negatively correlated with intercellular CO2 concentration.The net photosynthetic rate reduced in the range of 4.08% to 67.04%,stomatal conductance reduced in the range of 17.44% to 58.44%,transpiration rate reduced in the range of 12.08% to 48.08%,intercellular CO2 concentration increases in the range of 9.01% to 14.29%,the chlorophyll relative content reduced in the range of 12.16% to 37.23%.After simulated acid rain treatments the net photosynthetic rate was significantly positively correlated with stomatal conductance,transpiration rate,water use efficiency,and the relative chlorophyll content,and the net photosynthetic rate was negatively correlated with intercellular CO2 concentration.The transpiration rate was significantly positively correlated with stomatal conductance,water use efficiency,and the relative chlorophyll content,and the transpiration rate negatively correlated with intercellular CO2 concentration.In short,effect of simulated acid rain on photosynthetic characteristics of spring wheat leaves increases with the increase of hydrogen ion concentration more and more remarkable.
出处
《安徽农业科学》
CAS
北大核心
2010年第15期8069-8073,共5页
Journal of Anhui Agricultural Sciences
基金
国家科技部公益(气象)行业专项(GY-HY200806021)
中国气象局兰州干旱气象研究所干旱基金项目(IAM200921)
关键词
模拟酸雨
春小麦
水分利用效率
光合特性
Simulated acid rain
Spring wheat
Water use efficiency
Photosynthetic characteristics
