互叶白千层幼苗光合日进程

[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1900．00μmol／（m2·S）左右。14：00，光合有效辐射达最高值2000．00μmol／（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，叶片气孔导度迭峰值800．00mmol／（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。

Diurnal Change of Photosynthesis in Melaleuca alternifolia Seedlings

[Objective] The research aimed to provide theoretical basis for improving the cultivation technology of Melaleuca alternifolia and enhancing its yield and quality.[Method] The healthy functional leaves on the 5 cutting seedlings of M.alternifolia 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.alternifolia showed its first peak...