蓝蓟(Echium vulgare L.)不同密度光合日变化的研究  

Studies on Photosynthetic Diurnal Changes of Echium vulgare L.at Different Densities

作　　者：徐惠风[1] 冯政东[1] 杨溢 康岭生[3] 高志新[1] 

机构地区：[1]吉林农业大学农学院,长春130118 [2]吉林省农安县高家店农业技术推广站,吉林农安130227 [3]吉林省农业科学院农业生物技术研究所,长春130033

出　　处：《吉林农业科学》2014年第6期89-94,共6页Journal of　Jilin Agricultural Sciences

基　　金：吉林省科技厅基础应用项目(201105070);吉林省科技厅重点科技攻关项目(20130206072NY);吉林省教育厅重大项目(201240)

摘　　要：本研究通过密度5cm、10cm、15cm、20cm、25cm处理,采用Li-6400型光合仪测定蓝蓟叶片的光合指标。结果表明:光合日变化在密度20cm没有"午休"现象之外,其他密度均出现"午休"现象,密度大的"午休"时间出现在上午,密度小的"午休"出现在下午。10 cm的在10:00,5 cm的在12:00,其他密度在14:00;各密度处理中光合速率最大值为21.467μmol(CO2)/(m2·s),最小值为18.86μmol(CO2)/(m2·s),平均值为20.392μmol(CO2)/(m2·s)。从光合"午休"分析看,蓝蓟最佳栽培密度为20 cm。说明密度影响蓝蓟光合日变化,形成作物产量影响的直接因素。各密度中只有25 cm处理的净光合速率与气孔导度、蒸腾速率和气孔限制值表现为极显著相关,相关系数分别为0.94**,0.93**,0.95**;与胞间CO2浓度表现为显著相关,相关系数为0.92*,与水分利用效率和表观叶肉导度表现为极显著负相关,相关系数为-0.97**,-0.92**。其他密度处理中净光合速率和其他特征指标之间没有达到显著水平,说明栽培密度25 cm为最佳密度。The photosynthetic indexes of Echium vulgare L. leaves were determined using LI-6400XT Porta- ble Photosynthesis System with the density treatment of 5 cm, 10 cm, 15 cm, 20 cm and 25 cm. The results showed that all the treatments appear photosynthetic midday-depress except the density of 20 cm. Midday-depress appeared in the morning at larger density and appeared in the afternoon at small density, which appeared at 10 o＇clock in 10 cm, appeared at 12 o＇clock in 5 cm, others at 14 o＇clock. The maximum photosynthetic rate was 21.467 μmol·m^-2·s^-1, the minimum was 18.86 μmol·m^-2· s^-1, and the average was 20.392μmol·m^-2· s^-1. From the analysis of photosynthetic midday-depress, the optimum planting of Echium vulgare L. was 20 cm. Density affected photosynthesis diurnal variation of Echium vulgare L., that was the direct factor influencing crop yield. Only at the density of 25 cm, the correlation between net photosynthetic rate and transpiration rate and stomatal limitation appeared, the correlation coefficients were 0.94, 0.93 and 0.95. Net photosynthetic rate appeared significantly correlated with intercellular CO2 concentration, correlation coefficients was 0.92. It appeared highly significantly negative correlated to water use efficiency and mesophyll conductance, correlation coefficients was -0.97, -0.92. Correlation did not reach significant level at other density, it indicated that the optimum planting density was 25 cm.

关 键 词：蓝蓟 密度 光合日变化 光合“午休” 

分 类 号：S501[农业科学—作物学]