暗管与鼠道组合排水改造渍害稻田试验

Reclamation of Waterlogging Paddy Field by Means of Drainage of Buried Pipes Combined with Mole Channels

对湖积平原区的粘土渍害稻田,采用暗管与鼠道双层组合排水,在小麦、油菜生育期的雨季中,鼠道能有效地排除稻田的耕层滞水,减小田间地下水位上涨幅度;雨停后,在暗管排水作用下,地下水能迅速回降到离田面0.6～0.7m;稻田淹灌期,鼠道排水可增加两暗管之间的入渗强度,排泄土壤中有害物质。在渍害稻田改造中,适当加大暗管间距(24m),中间辅以鼠道排水,可起到工程投资省,改土效果明显,增产效益大的作用。

The method of double deck drainage by buried pipes combined with mole channels is adopted in clay waterlogging damaged field in lacustrine plain area. During the gr-owing period of wheat and rape in rainy season, mole channels can effectively drain off the water logging of plough horizon and reduce the range of lift of underground water level in paddy field.After rain stops, because of the drainage by buried pipes, the field underground water level rapidly drops down to 0.6~0.7m from the field surface During the submersion irrigation period of paddy field, mole channel drainage can increase seepage strength between the buried pipes and drain the harmful substances away. In the midst of reclamation of Nuteclogg lg dinlged field, proper increase of the distance (24m) between the buried pipes and setting auxiliary mole channels in the middle can economize the investment of projects, achieve a good result in reclamation and largely increase benefit of output.