小麦秸秆还田对水稻田水质的影响

Effect of Wheat Straw Returning to Paddy Field on Water Quality

为研究不同秸秆还田量下稻田水质情况,通过小麦秸秆全量还田、部分还田及全部离田对不同水稻栽插方式(直播稻、机插秧)的全生育期持续观察和田间水质检测,结果表明,化学需氧量、氨氮、总氮随着秸秆还田数量的减少污染指数相对减少,秸秆全部离田秧田水质污染指数明显低于秸秆全量还田秧田的水质污染指数;溶解氧含量随着秸杆还田数量的相对减少而含量相对增加。

In order to study the water quality of rice field under different straw returning quantity,the continuous observation and field water quality detection of different rice planting methods(direct seeding rice,machine transplanting rice)during the whole growth period were carried out by wheat straw returning,partially returning and completely leaving the field.The results showed that the pollution index of chemical oxygen demand,ammonia nitrogen and total nitrogen decreased with the reduction of straw returning quantity.The water quality pollution index of all straw discharged from the field was significantly lower than that of all straw returned to the field.The dissolved oxygen content increased with the decrease of the amount of straw returning to the field.