黄土高原坡改梯是减少面源污染的有效措施

Slope farmland converted to terraces is effective to reduce non-point source pollution in Loess Plateau

黄土高原坡耕地水土流失十分严重,土壤中养分和有害物质以水土流失为载体,淤积水库、河道、渠道,抬高河床,造成大面积面源污染。因此,在黄土高原区对坡耕地进行科学规划,因地制宜将其改造为水平梯田,不仅能有效增加土壤降雨入渗强度,减轻水土流失、控制坡耕地中养分和有害物质流失,而且是保障黄土高原区粮食安全和设施农业发展的重要措施。

Soil and water loss of slope farmland is very serious in Loess Plateau.Nutrients and harmful substances in the soil take soil erosion as the carrier,silting up reservoirs,river channels and channels,raising the riverbed and causing large-scale non-point source pollution.Therefore,scientific planning of slope farmland in the Loess Plateau and transforming it to terraces according to local conditions can not only effectively increase the infiltration intensity of rainfall,reduce soil erosion,control the loss of nutrients and harmful substances in sloping farmland,but also is an important project to ensure food security and the development of facility agriculture in hilly and mountainous areas.