宁夏老压砂地枣树不同水分条件下的光合特性研究

Research on Photosynthetic Characteristics of Jujube Planted in Gravel-covering Land under Different Moisture in Ningxia

通过对宁夏压砂地枣树在不同水分条件下的光合作用速率、外界光合作用有效辐射、大气CO2浓度、冠层温湿度及累计叶面积进行观测,通过将其光合作用速率与外界光合作用有效辐射值做比值来削弱当地大风多云对光合作用观测带来的影响,以此反映压砂枣树光合作用日变化和季节变化过程,得出压砂地枣树在展叶期光合作用速率整体水平较高;进入开花坐果期后,早上8∶00后光合作用强度明显下降。对光合作用速率与光合作用有效辐射、大气CO2浓度、冠层温湿度、累积叶面积进行相关性分析,得出光合作用有效辐射、大气CO2浓度和冠层相对湿度对宁夏中西部地区压砂枣树光合作用的影响较大,且枣树光合作用速率与累积叶面积显著负相关。

In this article,the diurnal change and seasonal change of photosynthesis of the jujube planted in gravel-covering land in Ningxia were analyzed by determining the photosynthesis rate,photosynthetic active radiation,atmospheric CO2 concentration,canopy temperature-humidity and the cumulative leaf area under different water conditions.It concluded that photosynthesis rate of jujube is higher in leaf expanding stage,the photosynthetic intensity decreased significantly since 8∶00in the morning after entering the flowering and fruit-bearing stage.The correlation analysis of photosynthesis rate,photosynthetic active radiation,atmospheric CO2 concentration,canopy temperature-humidity and cumulative leaf area was conducted.It concluded that the photosynthetic active radiation,atmospheric CO2 concentration and canopy relative humidity is the main factors of the photosynthesis of jujube in Ningxia.It was significantly negative correlation between photosynthesis rate and cumulative leaf area.