Ecological experiments on soil moisture in poplar-wheat complex and wheat monoculture(CK)pattern were conducted in the reclamation areas of Ili River basin.Results showed that(1)1～2 days after irrigation

soil humidity in plough layer(0—44 cm)in the two systems was increased by 5% and the increase of soil water content in lower layer(110—154 cm)in poplar-wheat complex system was greater than that in the CK.(2)There was less root distribution at the S2 spot in parallel direction in poplar-wheat complex system and the most of wheat and poplar roots were distributed in 20—30 cm soil layer in vertical direction

which have greatest competition for water and nutrition from soil.(3)The 1 000-grain weight in the CK was 4.56% more than that in poplar-wheat complex ecosystem and the 1000-grain weight of wheat at the S12 spot was 1.11 times that at the S2 spot in the poplar-wheat complex pattern.(4)Compared with the CK

diurnal mean value of transpiration rate in poplar-wheat complex system was 30.8 g/(m2·h)lower

diurnal evaporate amount was 1.07 g/d lower

diurnal average of air temperature was about 0.46 ℃ lower

and soil temperature was 0.24 ℃～1.20 ℃ lower.In view of water use

this study provides a theoretical support for feasibility and continuity of poplar-wheat complex ecosystem in the water and soil development areas of Ili River basin.