二氧化亚氮对樟树幼苗生长及光合作用的影响  

Effects of NO2 on Cinnamomum camphora seedlings growth and photosynthesis

作　　者：陈卓梅[1,2] 陈英旭[1] 杜国坚[2] 

机构地区：[1]浙江大学环境与资源学院,杭州310029 [2]浙江省林业科学研究院,杭州310023

出　　处：《应用生态学报》2009年第7期1650-1656,共7页Chinese Journal of Applied Ecology

基　　金：浙江省科学技术厅重点计划项目(2005C22056)资助

摘　　要：采用开顶式人工熏气装置，对1年生樟树幼苗进行了为期2个月不同体积分数NO2（0.1、0.5和4.0μl·L^-1）熏气试验，研究其对幼苗生长及光合作用的影响.结果表明：0.5和0.1μl·L^-1NO2处理促进了樟树幼苗生长，而4.0μl·L^-1NO2处理则抑制其生长.各处理樟树幼苗叶片净光合速率（Pn）日变化呈不对称的双峰型曲线，存在光合“午休”现象；在光合日进程中，0.5μl·L^-1NO2处理使叶片Pn提高，最大值达8.542μmolCO2·m^-2s^-1，4.0μl·L^-1NO2处理的大多数时段使Pn降低，而0.1μl·L^-1NO2处理对Pn的影响则依时段而不同；0.5和4.0μl·L^-1NO2处理提高了叶片气孔导度（Gs）和胞间CO2浓度（Ci）的最大值和最小值，0.1μl·L^-1NO2处理提高了Ci的最大值和最小值，降低了Gs的最大值和最小值.熏气处理中、后期，0.5μl·L^-1NO2处理叶片的日均净光合速率显著高于其他处理.在熏气处理前期，0.5和4.0μl·L^-1NO2处理使叶片最大PSⅡ的光能转换效率（Fv/Fm）显著下降；在熏气处理后期，4.0μl·L^-1NO2处理的叶片Fv/Fm仍显著低于对照.A 2-month fumigation experiment was conducted with opened top chambers to study the effects of different concentration （0. 1, 0. 5, and 4. 0 μl·L^-1 ） NO2 on the growth and photosynthesis of 1-year Cinnamomum camphora seedlings. Fumigation with 0. 1 and 0. 5 μlNO2·L^-1 promoted the growth of the seedlings, while with 4.0 μlNO2·L^-1 was in adverse. The diurnal variation of net photosynthetic rate （ Pn ） presented two-peaks, with an obvious depression in midday. 0. 5 μlNO2·L^-1 increased the Pn the maximum of Pn reached 8. 542 μmol CO2·m^-2s^-1 ;4.0 μlNO2·L^-1 decreased the Pn in most period of time ; while the effect of 0.1 μlNO2·L^-1 varied with time period. Fumigation with 0. 5 and 4.0 μlNO2·L^-1 increased the maximal and minimal values of stomatal conductance （Gs） and intercellular CO2 eoneentration （ Ci ）, while 0.1μlNO2·L^-1 increased the maximal and minimal values of Ci but deereased the maximal and minimal values of Gs. At the middle and late stages of fumigation, the mean P, of the seedlings treated with 0. 5 μlNO2·L^-1 was significantly higher than that treated with 0. 1 and 4 μlNO2·L^-1. At the early stage of fumigation, 0. 5 and 4. 0 μlNO2·L^-1 significantly decreased the maximal PS Ⅱ efficiency （ Fv/Fm ） ; and at the late stage, 4.0 μlNO2·L^-1 still decreased the Fv/Fm significantly.

关 键 词：NO2 樟树 熏气 生长 光合作用 

分 类 号：S792.23[农业科学—林木遗传育种]