【作者】 李萍萍； 李冬生； 王纪章； 付为国；

【Author】 Li Pingping~1,Li Dongsheng~(1,2※),Wang Jizhang~1,Fu Weiguo~1 (1.Key Laboratory of Modern Agricultural Equipment and Technology,Ministry of Education, Jiangsu University,Zhenjiang 212013,China; 2.School of Economics and Management,University of South China,Hengyang 421001,China)

【机构】 江苏大学现代农业装备与技术省部共建教育部重点实验室/江苏省重点实验室； 南华大学经济管理学院；

【摘要】 为了精确模拟不同光照下温室黄瓜光合作用的变化规律,提出了一种类卡方模型(QCSM)进行建模。使用Li-6400便携式光合测定系统测定了温度分别为16℃、20℃、24℃、26℃、28℃、30℃和光量子流通量密度(PPFD)为0～2000μmol/(m~2·s)动态条件下温室黄瓜叶片净光合速率(P_n),以P_n测定值为基础对QCSM参数进行了模拟。结果表明:QCSM拟合得到的黄瓜叶片净光合速率估计值■_n与实测值P_n相符。经过前一年的数据验证,模型精度较高,拟合优度达0.9908,残差标准误差(RSE)为0.4537。与负指数模型(ME)相比,QCSM净光合速率估计值与实测值较接近,同时,QCSM能得到包括光饱和点、补偿点、最大光合速率、暗呼吸、表观量子效率等在内的五个光合作用参数值。与非直角模型(NRH)相比,由QCSM估计的光饱和点、补偿点、暗呼吸与实际较接近。更多还原

【Abstract】 In order to exactly simulate the rule of greenhouse cucumber Photosynthesis under different photosynthetic photo flux density(PPFD),a model named quasi-chi-square model(QCSM),was established.Net photosynthetic rate (P_n) data of cucumber leaf were measured by Li-6400 Portable Photosynthesis System under dynamic conditions of temperature being 16,20,24,26,28,30℃,respectively,and PPFD being 0～2000μmol/(m~2·s),and based on the measured values of P_n,parameters of QCSM were fitted.The results showed that the estimated net photosynthetic rate data of■_n by the model were coincided with the measured data of P_n.Validation by yesteryear data indicated that model precision was very high with goodness of simulation of 0.9908 and residual standard error(RSE) of 0.4447.The estimated values of P_n by QCSM were closer to measured values compared with that of minus exponential model (ME),and five parameter values of photosynthesis,including light saturation point(LSP),light compensation point (LCP),maximum net photosynthetic rate(P_n max),dark respiration rate(DDR),apparent quanta effect(AQE),were obtained.Compared with those by non-rectangular model(NRH),the estimated values of LSP,LCP and DDR by QCSM are closer to measured values.更多还原