臭氧和气溶胶复合污染对杨树叶片光合作用的影响

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李景¹^,², 王欣¹, 王振华¹^,², 王斌¹^,², 王成章¹^,², 邓美凤¹, 刘玲莉¹^,²^,^*(

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Effects of ozone and aerosol pollution on photosynthesis of poplar leaves

LI Jing¹^,², WANG Xin¹, WANG Zhen-Hua¹^,², WANG Bin¹^,², WANG Cheng-Zhang¹^,², DENG Mei-Feng¹, LIU Ling-Li¹^,²^,^*(

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图4. 气溶胶和臭氧对叶片光合速率的影响。黑色实线表示显著正相关, 灰色实线表示显著负相关, 灰色虚线表示相关性不显著(p > 0.05); 线的粗线代表相关关系大小。数字为标准化的路径系数, 表示相关关系大小。星号表示显著性水平, 其中**, p < 0.05; ***, p < 0.01。AOD, 气溶胶光学厚度; AOT40, 超过40 nmol·mol^-1的小时臭氧浓度累积量; PAR_i, 冠层内部接收的光合有效辐射; PAR_o, 冠层外部接收的光合有效辐射; T_air, 气温。

Fig. 4. Direct and indirect effects of aerosol and ozone on leaf photosynthesis. Black and grey solid lines indicate significantly positive and negative correlation, respectively. Gray dash lines indicate correlations that are not significant (p > 0.05). The width of the lines indicates the strength of the correlations. Numbers adjacent to lines are standardized path coefficients and indicate the size of effects. Asterisks indicate significance level. **, p < 0.05; ***, p < 0.01. The model goodness of fits is suggested by c² and p-values (a: c²= 3.22, p = 0.07; b: c²= 0.56, p = 0.76). AOD, aerosol optical depth; AOT40, accumulative concentration of ozone that more than 40 nmol·mol^-1; PAR_i, photosynthetically active radiation of internal canopy; PAR_o, photosynthetically active radiation of external canopy; P_n, photosynthetic rate.