关键词: 生物量变化量, 生物量变化量

Abstract: The test with cucumber as the object of the research, adopted plot experiment to study the nitrate nitrogen leaching loss under different nitrogen managements in solar greenhouse. The results showed that, the highest yield and the nitrogen uptake of cucumber were obtained in treatment of OM+N1PK, the nitrogen uptake reached to 253.56 kg/hm². The nitrate nitrogen leaching loss from 0.9 m depth of soil layer was NPK＞OM+ N1PK＞OM + NPK＞OM＞CK. The nitrate nitrogen leaching loss was the highest on the treatment of using chemical fertilizer and reached to 205.52 kg/hm², the nitrate nitrogen leaching loss respectively reduced by 11.39%, 21.98%, 42.27%. the nitrate nitrogen accumulation of OM+N1PK was obviously higher than other treatment for 0- 1 m soil profile and the nitrate nitrogen accumulation at 0- 20 cm layer had reached to 389.66 kg/hm². It could provide essential nutrients for next stubble crops. On the whole, the treatment OM+ N1Pk improved the yield and the topsoil nitrogen uptake, increased the adsorption ability and accumulation of nitrate nitrogen in soils, decreased the nitrate nitrogen leaching loss, reduced the environmental risk.