Abstract:
Light intensity,temperature and humidity are the main influencing factors of photosynthetic rate,and they have a great influence on plant physiology.At present,there are a lot of studies on photosynthetic response of single environmental factor for plants.However,there are fewer researches on photosynthetic response of plants under the condition of multi-factor combination.In this study,three main environmental factors,namely,light intensity,temperature and humidity,were selected for multi-level uniform design in winter,aiming to obtain the law of photosynthetic rate changes of the leaves of
Caldesia grandis Samuel.The photosynthetic rate of
C.grandis was observed by means of Li-6400 Photosynthesis Analyzer to explore the influence of multiple factors (light intensity,temperature and humidity) upon the mature leaf.The comparative analysis indicated that multiple stepwise regression was the best among Linear Regression,multivariate quadratic regression,and multiple stepwise regression.The results indicated that light intensity was the primary factor that may affect photosynthetic rate of
C.grandis.There was a significant positive correlation (ln curve) between the light intensity and the photosynthetic rate.The Adjusted R Square achieved 0.958.