By using in situ leaching device, a field experiment was conducted to study the nitrate leaching amount and density at 60 cm soil depth, nitrate accumulation in soil profile(0-80 cm)of poplar-wheat intercropping ecosystem. Four treatments were installed, no fertilization(N0,0 kg/hm2),conventional fertilization(N140,140 kg/hm2),reduced N application(N70,70 kg/hm2),increased N application(N210,210 kg/hm2). The results indicated a positive correlation between quantity of leachate water and precipitation, the poplar-wheat intercropping ecosystem can reduce the quantity of eluviate solution. The nitrate leaching loss increased according to the increasing N fertilization rate. In treatment spot N210, the nitrate nitrogen loss from N fertilization at 60 cm soil depth was the greatest(13.89 kg/hm2), it declined by 60.27% and 50.11% in poplar-wheat intercropping ecosystem away from the poplar row 0.5 m and 1.5 m, respectly. The nitrogen leaching and accumulation were significantly lower in poplar-wheat intercropping ecosystem, and variances of the distribution for soil nitrate nitrogen were significant.
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