Delineation and integration of small watersheds in the southwest mountain areas in the perspective of'nature-humanity'integration
[Objective]The present paper aimed to adopt a'nature-human'integrated perspective,combine humanistic elements to define the threshold for small watershed division,strengthen the humanistic characteristics of small watershed division research,and provide zoning plan support for land space development and socio-economic construction in mountain areas using small watersheds as the basic unit.[Meth-od]Based on the natural hydrological processes and human attributes of small watersheds,the watershed area method,combined with the mean change point and the boundary overlap,were used to measure the subdivision threshold of small watersheds in six test areas within the study area,taking the southwest mountain areas of China as an example.After obtaining the optimal threshold,the southwest mountain areas were divided into units by small watersheds.The division results were integrated,and the quantity and spatial characteristics of the integrated results were analyzed.A fusion method for small watershed subdivision in mountain area was proposed.[Result](ⅰ)The optimal threshold for the division of small watersheds in the southwest mountain areas was 30.00 km2.(ⅱ)The number of small watersheds in the southwest mountain areas was 16 075,with an area range of 25.07 km2 to 431.82 km2.(ⅲ)In terms of area,there were 8702 small watersheds less than 50.00 km2,accounting for 54.13％;5358 small watersheds between 50.00 km2 and 100.00 km2,accounting for 33.33％;and 2015 small watersheds greater than 100.00 km2,accounting for 12.53％,which basically met the current requirements of the Ministry of Water Re-sources.[Conclusion]The method for dividing and integrating small watersheds in mountain area is proposed in this study,as verified through field measurements in the southwest mountain areas,reflecting the natural and human attributes of small watersheds.It adequately meets the needs of current organizational unit management in mountain area and can serve as a methodological reference for the zoning of small watersheds in mountain area.
Small watershedsPartition thresholdSouthwest mountain areasMountain area zoningMan-land relationship
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