The Comparative Analysis of the Multiple-factor Test Results for Photosynthetic Rate of Caldesia grandis
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摘要: 光强、温度、湿度是植物光合速率的主要影响因子，对植物的生理生态影响巨大。目前对植物单环境因子的光合响应研究很多，但是，对于多因子组合情况下的植物光合响应研究很少。本研究在冬季选取光强、温度、湿度3种主要环境因子进行多水平均匀设计，以期用较少的测试水平获得该季节宽叶泽苔草叶片随环境因子的变化而产生的光合响应变化规律。用Li-6400光合测定系统进行宽叶泽苔草对不同光照强度、温度、湿度组合因子的光合速率响应对比测试实验研究。对测试结果进行了多元一次线性、多元二次线性、多元非线性回归对比分析。结果表明:多元非线性回归方程对光照强度、温度、湿度多因子组合下的光合速率变化描述效果最好（R2=0.958），宽叶泽苔草光合速率与光照强度呈显著ln曲线相关，而非一次线性和二次线性相关。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.
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