图2. 叶绿素荧光主动与被动联合观测耦合气体交换测定系统及其示例数据。测定系统主要包括: 光谱仪(A); PAM荧光计(B); 气体交换(C); 入射光线(D); 进光口(E); 封闭的叶室(F); 光纤(G); 被测叶片(H)。F_d, 光适应下可变荧光值; F_m, 最大荧光值; F_m', 光适应下最大荧光值; F_o, 最小荧光值; F_s, 稳态荧光值; F_v, 最大可变荧光值; NPQ, 非光化学淬灭。

Fig. 2. Combined observation of actively and passively induced chlorophyll fluorescence coupled gas exchange measurement system and its sample data. The measurement system mainly includes: spectrometer (A); PAM fluorometer (B); gas exchange (C); incident light (D); light inlet (E); enclosed leaf chamber (F); optical fiber (G); leaves (H). F_d, variable fluorescence value under light adaptation; F_m, maximum fluorescence value; F_m', maximum fluorescence value under light adaptation; F_o, minimum fluorescence value; F_s, steady-state fluorescence value; F_v, maximum variable fluorescence value; NPQ, non-photochemical quenching; PAR, photosynthetically active radiation; SIF, sun-induced chlorophgll flhorescence.