骏枣叶片光合速率及叶绿素变化研究

Study on the Net Photosynthesis Rate Characteristic and Chlorophyll Content of 'Junzao' Jujube Leaves

以骏枣为对象，分别测定其上部，中部和下部枣吊叶片的净光合速率和叶绿素含量。结果表明：枣吊不同叶位的净光合速率（Pn）随叶位的增加不断降低，4～7位叶片的Pn值可以反映整个枣吊的光合能力；在冠层分布上，Pn值，上部枣吊〉中部枣吊〉下部枣吊；枣吊中部位置的叶绿素含量相对稳定，能够反映整个枣吊叶绿素相对含量，且叶绿素相对含量与净光合速率呈正相关。

Used‘Junzao＇Jujube as materials, studied the net photosynthesis rate and chlorophyll content of ＇Junzao＇ Jujube leaves. The results showed that the Pn of lower position was the highest, secondly was in mid-position, the upper-position was the lowest, the Pn of 4 - 7 position could reflect the photosynthetic capacity of bearing branch, distribution in the canopy, the upper bearing branch had higher Pn than central and lower bearing branch; The chlorophyll content of mid-position was stability; chlorophyll content and photosynthetic rate were positively correlated.