CAJ | 학술논문

采用Li-6400光合仪测定CO2400μmol·mol-1条件下小叶杨的光响应数据。分别采用直角双曲线修正模型、二次多项式模型、直角双曲线模型、非直角双曲线模型及指数模型对光响应曲线进行拟合，探讨5种模型对小叶杨的适用性。结果表明：直角双曲线、非直角双曲线及指数模型不能处理光抑制部分的光响应数据，且得到的最大净光合速率大于实测值，光饱和点远小于实测值；二次多项式虽能处理光抑制部分的光响应数据，但得到的光合参数有悖常识；直角双曲线修正模型不仅能处理光抑制部分的光响应数据，且拟合得到的各项光合参数均与实际相符，是拟合小叶杨光响应曲线的最适宜模型。
채용Li-6400광합의측정CO2400μmol·mol-1조건하소협양적광향응수거。분별채용직각쌍곡선수정모형、이차다항식모형、직각쌍곡선모형、비직각쌍곡선모형급지수모형대광향응곡선진행의합，탐토5충모형대소협양적괄용성。결과표명：직각쌍곡선、비직각쌍곡선급지수모형불능처리광억제부분적광향응수거，차득도적최대정광합속솔대우실측치，광포화점원소우실측치；이차다항식수능처리광억제부분적광향응수거，단득도적광합삼수유패상식；직각쌍곡선수정모형불부능처리광억제부분적광향응수거，차의합득도적각항광합삼수균여실제상부，시의합소협양광향응곡선적최괄의모형。
The light response data of Populus simonii were measured by Li-6400 at concentration of CO2 400μmol·mol-1.Modified rectangular hyperbola model,quadratic polynomial model,rectangular hyperbola model,non-rectangular hyperbola model and expo-nential model were used to fit the light response curves of Populus simonii,and the applicability of these five models to the Populus si?monii were discussed. The results indicated that rectangular hyperbola model,non-rectangular hyperbola model and exponential mod-el were incapable of dealing with the light response data of photoinhibition,and the calculated maximum net photosynthetic rates were bigger than the measured value,besides,the the calculated light saturation points were far lower than the measured;Although, the quadratic polynomial model can process data of photoinhibition,the resulting photosynthetic parameters were contrary to com-mon sense;Rectangular hyperbola model not only could process light response data under photoinhibition,but also could get photo-synthetic parameters which was conformity with reality.