Abstract
To effectively control soil erosion, three hierarchies of the National Soil and Water Conservation Regionalization Scheme have been established in China. However, the scheme has its limits, which can be summarized by two points: first, the tertiary hierarchy functional region exhibits obvious heterogeneity; second, the ecosystem function does not influence the regionalization scheme results during the process of regionalization. To enhance the guidance of the regionalization, a new indicator system included soil erosion risk, soil erosion intensity and ecosystem service value was developed to explore the subdivision of the tertiary hierarchy functional region. Moreover a scheme for the subdivision of the tertiary hierarchy functional region was formed. In this scheme, the central Hunan hilly soil conservation and living environmental protection section was divided into three subregions: Luoxiao-Xuefeng Mountain high ecological value section, Xiangjiang middle and downstream medium ecological value section, and Hengyang Basin low ecological value section. Specifically, with regard to soil and water conservation regionalization, the concept of subregions within the tertiary hierarchy-based functional region was proposed and the new indicator system that highlighted ecosystem functions was applied for the first time on a regional scales; this method provides a new way of thinking about other regionalization schemes.
Highlights
Soil and water loss has been regarded as one of the most global environmental problems, affecting the ecosystem and the safety of lives and property[1]
Focusing on the problems that soil and water conservation measures cannot be adapted to local conditions and that ecosystem services have not been highlighted in the soil and water conservation regionalization indicator system, this paper selects the central Hunan hilly soil conservation and living environmental protection section as a case to discuss the subdivision of the third-level subregion
Based on the modified indicator system and supported by the spatial analysis function of ArcMap, the central Hunan hilly soil conservation and living environmental protection section was further divided into three subregions: Luoxiao-Xuefeng mountain high ecological value section (V-4-6tr-1), Xiangjiang middle and downstream middle ecological value section (V-4-6tr-2), and Hengyang Basin low ecological value section (V-4-6tr-3)
Summary
Soil and water loss has been regarded as one of the most global environmental problems, affecting the ecosystem and the safety of lives and property[1]. The indicator system of this regionalization mainly considers the topographic features, hydrothermal conditions, and hydrology, soil, land use, and socioeconomic indicators Based on this indicator system, China (excluding the Hong Kong, Macao and Taiwan regions) was divided into eight regions, 41 subregions and 117 sections according to a three-tier hierarchy[2]. Focusing on the problems that soil and water conservation measures cannot be adapted to local conditions and that ecosystem services have not been highlighted in the soil and water conservation regionalization indicator system, this paper selects the central Hunan hilly soil conservation and living environmental protection section as a case to discuss the subdivision of the third-level subregion. Based on GIS technology, this paper constructed a soil and water conservation regionalization indicator system for the tertiary subregion to enhance ecosystem service functions and this system was used to further divide the central Hunan section. The results of this research are of great significance for improving soil and water conservation regionalization and can be a reference for formulating soil conservation policies
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