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北宋时期,在黄河中游今洛河、泾河、渭河上中游地区及无定河、窟野河沿岸地带驻军屯垦。驻军多达四十万,屯垦土地面积不下十数万顷,使黄土高原地区的自然生态环境遭到破坏,水土流失加重,导致黄河下游泥沙增加,河道淤积严重,决溢灾害日益增多。文章利用较多的史料分析认为,北宋时期黄河中游黄土高原地区大面积土地垦殖,在很大程度上增加了黄河下游的河患。
During the Northern Song Dynasty, in the middle reaches of the Yellow River, Jinluo River, Jinghe River, the upper middle reaches of the Weihe River, and the garrison troops stationed along the Wuding River and Kuye River belts. Up to 400,000 garrisons and no more than a few tens of thousands of hectares of cultivated land have been damaged. The natural ecological environment in the Loess Plateau is damaged and the soil and water loss is aggravated. As a result, the sediment in the lower Yellow River increases, the siltation of the riverway is serious, and the number of disaster-stricken areas is increasing. The article uses more historical data that the large area land reclamation in the Loess Plateau in the middle reaches of the Yellow River during the Northern Song Dynasty greatly increased the river plague in the lower Yellow River.