Discussion on the suitable area for the construction of ecological clean small watershed

CHENG Dongbing; ZHAO Hui; CAO Junqi; YAN Fengling; YANG Hefei; ZHANG Jingxin

doi:10.3969/j.issn.1000-1123.2025.07.009

Abstract：After more than 20 years of continuous exploration and innovation,the ecological clean small watershed has formed a relatively perfect theoretical basis,construction mode,measure system and working mechanism.And answered the question of"what is the ecological clean small watershed?""How to build ecological clean small watershed?""How about ecological clean small watershed?"and other key issues.Due to the different natural endowment conditions and economic and social development levels of small watersheds,not all small watersheds need to be built into ecologically clean small watersheds,and not all small watersheds can meet the standards of ecologically clean small watersheds after construction,which requires further answers of"where to build?".Based on years of work experience,this paper discusses the delineation of suitable areas for the construction of ecologically clean small watersheds.It is believed that the division of small watershed is the basis of work,respect the natural endowment conditions of small watershed,give priority to serving the main functional positioning of the region,and coordinate the construction of livable and beautiful villages for pollution control and clean water.Water industry helps rural revitalization and encourages the diversification of model types.Guided by problems and needs,with the goal of realizing green mountains,clean water,beautiful villages and people's wealth,this paper comprehensively collects relevant spatial data of small watersheds,and proposes a"three-step superposition method"to carry out suitability evaluation of small watershed construction.The trial case shows that the method and process are feasible.Finally,some suggestions are put forward,such as step-by-step implementation,overall coordination,digital management,identity identification and co-construction and sharing mechanism of ecological clean small watershed.