阿克苏5种果树滞尘量对其水分利用效率的影响

选择新疆阿克苏市柯柯牙典型的5种果树:红枣（Ziziphus jujuba）、核桃（Juglans regia）、苹果（Malus pumila）、葡萄（Vitis vinifera）和香梨（Pyrus sinkiangensis），并对树种叶面滞尘量及其对水分利用效率的影响进行研究。结果表明，5种果树滞尘能力为葡萄5.37 mg/cm²>香梨4.55 mg/cm²>红枣3.88 mg/cm²>核桃3.03 mg/cm²>苹果0.92 mg/cm²。水分利用效率为葡萄（2.646 μmol·mmol^-1）＞香梨（1.810 μmol·mmol^-1）＞核桃（1.698 μmol·mmol^-1）＞红枣（1.359 μmol·mmol^-1）＞苹果（1.043 μmol·mmol^-1）。通过分别比较5种果树滞尘量与水分利用效率之间的相关性得出，5种果树的滞尘量与净光合速率、蒸腾速率、水分利用效率之间并无显著相关关系。表明果树在长期适应极端环境的过程中，形成了自身的调节机制，滞尘量对果树的水分利用效率的影响不大。

The Effect of the Dust-retaining Capability of the Five Typical Fruit Trees Cultivated in Kokyar of Aksu on the Water Use Efficientcy

Five typical fruit trees cultivated in Kokyar of Aksu,Xinjiang were selected to study the dust-retaining capability and water use efficientcy.The dust retaining capacity of the five fruit trees was in the order of Vitis vinifera>Pyrus sinkiangensis>Ziziphus jujuba>Juglans regia >Malus pumila.The order of water use efficiency was V.vinifera >P.sinkiangensis>J.regia>Z.jujuba >M.pumila.No significant correlations were found between dust retaining capacity and photosynthesis,transpiration and water use efficiency,suggesting that fruit trees had formed their own regulatory mechanisms in the long process of adaptation to extreme environments.Dust on fruit tree leaves did not have strong effect on water use efficiency.