Study on the Photosynthetic Characteristics of Populus euphratica Oliv and Populus Russkiijabl under Different Water Treatments

【Objective】The purpose of this project aims to to investigate photosynthetic characteristics of the tree leaves of protection forest species under different water treatments by taking Populus euphratica and Populus Russkii jabl from the big agriculture of Karamay as experimental materials.【Method】Two different furrow irrigation treatments(with 250 m3 and 500 m3 irrigation volume,respectively) were set,and photosynthetic haracteristics of Populus euphratica Oliv and Populus Russkii jabl were measured.【Result】 Diurnal variations of P.euphratica and Populus Russkii jabl present a single peak or double peak curve,and the Pn,WUE of P.euphratica appeared lower at 12:00.Gs appeared to vary in a single peak curve and Ci appeared to vary in a V shaped curve.Under same experimental conditions,the Pn,WUE,Gs,Tr and Ci of Populus euphratica Oliv appeared higher than those of Populus Russkii jabl.【Conclusion】Under different water treatments,Populus euphratica Oliv and Populus Russkii jabl's Gs,Pn,Tr with water treatment of 500 m3/667m2 were higher than those with water treatment of 250 m3/667m2;With water treatment of 500 m3/667m2 Populus euphratica Oliv and Populus Russkii jabl's Ci and WUE were lower than those with water treatment of 250 m3/667m2;WUE showed that water with water treatment of 500 m3/667m2 can be efficiently used with Populus euphratica Oliv and higher photosynthetic capacity remains with this water treatment,thus leading to the improvement of water use.