华南8号木薯光响应参数日变化及其主要影响因子  

The Diurnal Variation of Light Parameters and the Main Impact Factors of Cassava South China 8

作　　者：左应梅[1] 陈惠娟[1] 杨重法[1] 邓权权[1] 唐建[1] 

机构地区：[1]海南大学农学院,海南儋州571737

出　　处：《中国农学通报》2010年第13期371-375,共5页Chinese Agricultural Science Bulletin

基　　金：海南省重点学科建设项目(Xkxm0811-09);木薯干物质生产与分配的生理生态研究

摘　　要：为研究华南8号木薯光合参数的日变化规律及其与主要影响因子间的关系,采用LI-6400光合作用测定仪对其光合作用的日进程进行了测定与分析。结果表明:华南8号的Pmax日变化呈单峰曲线,峰值出现在上午9:00左右,"午休现象"不明显。午间叶片光合能力的轻微减弱主要受到非气孔因素影响。最大净光合速率(Pmax)、表观量子效率(a)、光补偿点(LCP)、光饱和点(LSP)等光合参数在一天中是不断变化的。7:00-17:00,Pma(xCO2)变幅为:23.65～32.84μmol/(m2·s);a变幅为:0.0482～0.0683;LCP变幅为:30.60～50.78μmol/(m2·s);LSP变幅为:1845.64～2418.60μmol/(m2·s)。多元逐步回归分析结果表明:各光合参数的主要影响因子分别是,a为RH,显著正效应;LCP为PAR,显著正效应;LSP为Cond和Vpdl,其中Cond为显著正效应,Vpdl为不显著负效应,效应大小依次为Cond>-Vpdl;Pmax的主要影响因子是Cond、RH和Ci,其中Cond和RH为极显著正效应,Ci为不显著负效应,效应大小依次为Cond>RH>-Ci。For a general study of the daily variation regulation of the photosynthetic parameters and its relationship between the main impact factors of Manihot esculenta Crantz.cv.M. South China 8（SC8） . The diurnal variation of photosynthesis of SC8 is measured and analyzed by employing LI-6400 portable photosynthesis system. The results show that the curve representing the diurnal course of the maximum net photosynthetic rate（Pmax）of SC8 has a single peak, at which the maximum net photosynthetic rate reaches the maximum value at 9：00.And this indicates that there existed no obvious ＂midday depression＂ in photosynthesis of SCS.The dominant factor of slight declining in photosynthesis which is caused by non-stomatal limitation. The light parameters of Maximum net photosynthetic rate（Pmax）, Apparent quantum efficiency （a） , Light compensation point （LCP）, Light saturation point （LSP） of the leaves are changing continuously during the day. From 7：00 to17：00,the Pmax（CO2）ranging between 23.65-32.84μmol/（m2·s）;the a ranging between 0.0482- 0.0683;the LCP ranging between 30.60-50.78 μmol/（m2·s）;the LSP ranging between 1845.64-2418.60μmol/ （m2·s）.The results of multiple stepwise regression analysis show that RH is the main factor which affects on a, as a significant positive effect; PAR is the main factor which affects on LCP, as a significant positive effect; Cond and Vpdl arc the main factors which affect on LSP and the order of effecting is Cond（significant positive effect）〉 Vpdl（ no significant negative effect）;Cond, RH and Ci are the main factors which affect on Pmax and the order of effecting is Cond（very significant positive effect）〉 RH（very significant positive effect）〉 Ci （no significant negative effect）.

关 键 词：木薯 光合参数 日变化 影响因子 

分 类 号：S311[农业科学—作物栽培与耕作技术]