摘要
以天名精(Carpesium abrotanoides L.)为材料,采用便携式光合仪LI-6400测定其光响应曲线,用5种常用模型对数据进行拟合,探讨天名精光响应的最适模型,并分析天名精光合速率与其他光合参数的相关性。结果表明:(1)直角双曲线改进模型拟合效果最好,拟合得到的决定系数(R^2)达0.999,得到的最大净光合速率(Pn_(max))为16.34μmol CO_2·m^(-2)·s^(-1)光饱和点(LSP)为1 793.65μmol·m^(-2)·s^(-1)、光补偿点(LCP)为39.43μmol·m^(-2)·s^(-1)、暗呼吸速率(R_d)为2.16μmol CO_2·m^(-2)·s;(2)天名精的净光合速率(Pn)与气孔导度(Gs)、光合有效辐射强度(I)、蒸腾速率(Tr)和CO_2浓度(CO_2R)呈极显著正相关,与胞间CO_2浓度(Ci)呈极显著负相关。
The light response curve of Carpesium abrotanoides L. was determined by portable photosynthetic apparatus Li-6400, and the optimal model of photosynthesis light response curve were explored by five common models, and the correlation between photosynthetic rate and other photosynthetic parameters was also analyzed. The results showed that:( 1 )the modified rectangular hyperbola model was the optimal model for describing the light-response curve of C. abrotanoides L. with R^2 = 0.999, and the maximum net photosynthetic rate ( Primax ) was 16.34μmol CO2·m^-2·s^-1, the light saturation point(LSP)was 1 793.65μmol·m^-2·s^-1, the light compensation point(LCP)was 39.43 μmol·m^-2·s^-1, the dark respiration rate(Rd)was 2. 16 Ixmol ·m^-2·s . ( 2 ) The net photosynthetic rate ( Pn ) was positively correlated with stomatal conductance ( Gs ), photosynthetically active radiation intensity (I), transpiration rate ( Tr ) and CO2 concentration ( CO2R ), and negatively correlated with intercellular CO2 concentration(Ci).
出处
《上海农业学报》
CSCD
2017年第4期29-34,共6页
Acta Agriculturae Shanghai
基金
西华师范大学博士启动基金(15E021)
四川省科技厅应用基础项目(2015JY0140)
四川省教育厅项目(12ZA289)
关键词
天名精
光响应曲线
模型
相关性
Carpesium abrotanoides L.
Light response curve
Models
Correlation