氮添加和铵硝态氮配比对杉木幼苗光合特性及叶绿素荧光参数的影响

全小强, 王燕茹, 李小玉, 梁海燕, 王立冬, 闫小莉

Effects of nitrogen addition level and NH4+-N to NO3--N ratio on photosynthetic characteristics and chlorophyll fluorescence parameters in Cunninghamia lanceolata seedling

QUAN Xiao-Qiang, WANG Yan-Ru, LI Xiao-Yu, LIANG Hai-Yan, WANG Li-Dong, YAN Xiao-Li

图1 不同氮添加水平与铵硝态氮配比下杉木叶片光合特征参数(平均值±标准误)。不同大写字母表示在同一氮添加水平下不同铵硝态氮配比间的差异显著(p < 0.05); 不同小写字母表示同一铵硝态氮配比下不同氮添加水平间的差异显著(p < 0.05)。N1-N3, 氮添加水平分别为: 0.5、1.0、2.0 mmol·L-1; P1-P7, NH4+-N和NO3--N的配比分别为: 10:0、8:2、6:4、5:5、4:6、2:8、0:10。

Fig. 1 Photosynthetic characteristics parameters of Cunninghamia lanceolata leaves under different nitrogen addition levels and NH4+-N/NO3--N ratios (mean ± SE). Different uppercase letters indicate the significant difference between different NH4+-N/NO3--N ratio at the same nitrogen addition level (p < 0.05); different lowercase letters indicate significant differences between different nitrogen addition levels under the same NH4+-N/NO3--N ratio (p < 0.05). N1-N3, nitrogen addition level: 0.5, 1.0, 2.0 mmol·L-1; P1-P7, NH4+-N to NO3--N ratio: 10:0, 8:2, 6:4, 5:5, 4:6, 2:8, 0:10.