摘要
用ＣＩＤ－３０１ＰＳ便携式光合作用测定仪的开放系统研究了生长于庐山山地上秋苗叶片的光合特性春对蔗荫的不与适应性，结果表明：（１）在夏季晴天、土壤供水充足的条件下，鹅掌楸苗期向阳叶片的光合速率有明显的午休现象，这可能与气孔限制和光抑制有关。（２）鹅掌楸苗期的光饱和点为１２００μｍｏｌｐｈｏｔｏｎｓ／ｍ＾２ｓ左右，光补偿点为２０μｍｏｌ ｐｈｏｔｏｎｓ／ｍ＾２·ｓ左右。
With the aid of the CI301PS portable photosynthesis system,a field study on the photosynthetic characteristics in leaves of Liriodendron chinense seedlings was made.The midday photosynthetic depression was observed on sunny day in summer,which was possibly due to the stomatal limitation and photoinhibition of photosynthesis.The light compensation point was about 20μ mol photons/m2s,the light saturation point was around 1200μmol photons/m2s,and the lightsaturating photosynthetic rate was in a range of 8～10μmol CO2/m2s.The CO2 compensation concentration of photosynthesis was more than 60μmol/mol.These indicated that although L.chinense was of a C3 type,sun plant its seedling could tolerate shade to a certain level.The responses of transpiration,stomatal resistance and internal CO2 concentration(Ci) of L.chinense to shade were different at different time in a day.By the stepwise multiple regression,it was found that PAR,R and Ci were the most dominant factors affecting the photsynthesis rate of L.chinense.Moreover,the solar energy utilization efficiency of L.chinense was about 094%.
出处
《生态学报》
CAS
CSCD
北大核心
1999年第2期164-169,共6页
Acta Ecologica Sinica
关键词
鹅掌楸
光合速率
光能利用率
蒸腾速率
气孔阻力
Liriodendron chinense seedlings,photosynthesis,transpiration,stomatal resistance,solar energy utilization efficiency.
