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三、生物措施技术及质量要求小流域治理的生物措施,主要就是造林、种草、绿化荒山沟坡、增加大地植被、改善生态环境,为发展农业生产创造良好的条件。 (一)整地整地既是为了改变地形条件,缩短坡长,减缓径流,控制水土流失,也是为了拦蓄雨水,防旱保墒,促进林草生长。整地的主要形式有: 1.鱼鳞坑:多在土层较薄、坡度较
III. Technical and Biological Requirements for Biological Measures Biological measures for small watershed management are mainly afforestation, grass planting and afforestation of barren mountain slopes, increasing the vegetation on the earth, improving the ecological environment and creating favorable conditions for the development of agricultural production. (A) Land preparation Soil preparation is to change the terrain conditions, shorten the slope length, slow runoff and control soil and water loss, but also to intercept rainwater, drought and soil conservation, and promote the growth of forest and grass. The main forms of site preparation are: 1. Fish-scale pit: more in the soil thinner, more gradient