南岭栲等常绿阔叶林优势树种光合特性分析

Analysis of Photosynthetic Characteristics of Dominant Tree Species ( Castanopsis fordii Hance etc.) in Evergreen Broadleaved Forest

基于指数改进模型估算了亚热带常绿阔叶树种南岭栲(Castanopsis fordii Hance)、黧蒴栲(Castanopsis fissa Rehdet Wils)和丝栗栲(Castanopsis fargesii)的光合参数特性。南岭栲和黧蒴栲光饱和点分别为1 589.37、1 688.33μmol/(m2·s),两者没有显著差异,均比丝栗栲的1 246.27μmol/(m2·s)大。黧蒴栲光补偿点为23.8μmol/(m2·s),比南岭栲的35.06μmol/(m2·s)小,但两者均与丝栗栲的32.67μmol/(m2·s)无显著差异。黧蒴栲表观光量子效率为0.074,与南岭栲的0.068没有显著差异,两者均比丝栗栲的0.053大。南岭栲最大净光合速率最大,为9.45μmol/(m2·s),丝栗栲的6.07μmol/(m2·s)与黧蒴栲的7.31μmol/(m2·s)没有显著差异。南岭栲暗呼吸也最大,为0.83μmol/(m2·s),其次是丝栗栲,0.59μmol/(m2·s),黧蒴栲暗呼吸最小,为0.29μmol/(m2·s)。3个树种中南岭栲和黧蒴栲具有很强的光环境适应能力和光合能力,具有较大的生长潜力。

Based on the modified exponential model , the photosynthetic parameters of Castanopsis fordii Hance, Castanopsis fissa Rehdet Wils and Castanopsis fargesii that were dominant tree species in evergreen broad-leaved forest were estimated .The light saturation points of Castanopsis fordii Hance and Castanopsis fissa Re-hdet Wils were 1 589.37 and 1 688.33 μmol/（m2· s） respectively,not significantly different from each other,but both more than that of Castanopsis fargesii’s 1 246.27 μmol/（m2· s）.The light compensation point of Castanopsis fissa Rehdet Wils was 23.8 μmol/（ m2 · s ）, which was less than that of Castanopsis fordii Hance ’ s 35.06 μmol/（m2· s）,but both not significantly different from that of Castanopsis fargesii’s 32.67 μmol/（m2· s）. The apparent light quantum efficiency of Castanopsis fissa Rehdet Wils was 0.074,which was not significantly differ-ent from that of Castanopsis fordii Hance’s 0.068,but they were both more than that of Castanopsis fargesii’s 0.053.The maximum net photosynthetic rate of Castanopsis fordii Hance was 9.45 μmol/（m2· s）,more than that of Castanopsis fargesii’s 6.07 μmol/（m2· s）and Castanopsis fissa Rehdet Wils’s 7.31μmol/（m2· s）, but the later two were not significantly different from each other .The dark respiration rate of Castanopsis fordii Hance was the maximum,0.83 μmol/（m2· s）,and the next was that of Castanopsis fargesii’s 0.59 μmol/（m2 · s）,the smallese was that of Castanopsis fissa Rehdet Wils’s 0.29 μmol/（m2· s）.The result of comprehen-sive comparison was that the photosynthetic capacity and adaptability to light environment of Castanopsis fordii Hance and Castanopsis fissa Rehdet Wils were strong ,and had good growth potential .