互叶白千层幼苗光合日进程  

Diurnal Change of Photosynthesis in Melaleuca alternifolia Seedlings

作　　者：莫昭展[1] 梁海清[1] 

机构地区：[1]玉林师范学院,广西玉林537000

出　　处：《安徽农业科学》2009年第22期10478-10479,10532,共3页Journal of Anhui Agricultural Sciences

基　　金：广西自然基金项目(桂科青0832099);广西教育厅项目(GJKY2008041);玉林师范学院青年基金项目(200703)

摘　　要：[目的]为改进互叶白千层栽培技术,提高其产量和质量提供理论依据。[方法]随机选取5株互叶白千层扦插苗上的健康功能叶片作为测定对象,用TPS-1便携式光合测定系统同步测定其净光合速率等指标。[结果]10:00左右,互叶白千层的净光合速率出现第1个峰值44.00μmol/(m2.s),初步确定其光饱和点为1 900.00μmol/(m2.s)左右。14:00,光合有效辐射达最高值2 000.00μmol/(m2.s)。16:00左右,互叶白千层的净光合速率出现第2个峰值4.05μmol/(m2.s)。16:00,空气CO2浓度降至最低值。11:00,叶片气孔导度达峰值800.00 mmol/(m2.s)。12:00,蒸腾速率达峰值。8:00,水分利用率最高。[结论]互叶白千层的光合日变化呈双峰型,其净光合速率日变化与空气CO2浓度呈显著负相关,与光合有效辐射呈极显著正相关,与胞间CO2浓度呈显著负相关。[ Objective ] The research aimed to provide theoretical basis for improving the cultivation technology of Melaleuca ahernifolia and enhancing its yield and quality. [ Method] The healthy functional leaves on the 5 cutting seedlings of M. alternifoliu were randomly selected as measuring objects and their indexes such as net photosynthetic rate were measured synchronously by TPS-1 portable photosynthesis measurement system. [ Result] At about 10：00, the net photosynthetic rate of M. cdternifolia showed its first peak value of 44.00 μmol/（ m2·S）, its light saturation point was ascertained to be about 1 900.00 μmol/（m2·S） preliminarily. At 14：00, the photosynthetically active radiation reached its maximum of 2 000.00μmol/（ m2·S）. At about 16：00, the net photosynthetic rate of M. alternifo[ia showed its second peak value of 4.05 μmol/（m2·S）. At 16：00, the carbon dioxide conen, in air decreased to its lowest value. At 11：00, the leaf stomatal conductance reached its peak value of 800.00 mmol/（ m2·S）. At 12：00, the transpiration rate reached its peak value. At 8：00, the water utilization ratio was highest. [ Conclusion] The diurnal variation of photosynthesis in M. alternifolia was shown to be double peak type, its diurnal variation of net photosynthetic rate showed significant negative correlation with the carbon dioxide eonen, in air, extremely significant positive correlation with photosynthetically active radiation and significant negative correlation with intercellular carbon dioxide concn.

关 键 词：互叶白千层 光合变化 日进程 

分 类 号：S685.99[农业科学—观赏园艺]