Quantitative assessment of ecological assets in the world heritage karst sites based on remote sensing: with a special reference to South China Karst

Abstract

The ecological benefits provided by ecological assets play an important role in im-proving human well-being, but there are few feasible methods to describe their status and trends by combining the quantity and quality data of ecological assets. This study is based on LUCC and integrates data on the quantity and quality of ecological assets. Based on the ecological asset index (EQ and EQi), the ecological assets of the Shibing karst and the Libo-Huanjiang Karst heritage sites are quantitatively evaluated, and their influencing factors are qualitatively analyzed. The results show that, (1) The ecological assets of the Shibing Karst and the Libo-Huanjiang Karst are mainly forest ecological assets, accounting for 89.31% and 89.98% of the ecological assets of the heritage sites, respectively. The proportion of ecological assets in cropland, shrubs, grasslands, water bodies, and impermeable surfaces is small. (2) The ecological asset quality of the two heritage sites is similar, with a two-level differentiation state. The ecological asset quality of forests and shrubs is mainly excellent, good, and moderate, while the ecological asset quality of cropland and grassland is mainly inferior and poor. From the overall quality perspective, the ecological asset quality of both heritage sites has significantly improved. (3) From 2000 to 2021, the EQ of the Shibing Karst increased from 180.179 to 225.606. The EQ of the Libo-Huanjiang Karst has increased from 560.463 to 641.269. Among the EQi of the two sites, forest > cropland > shrubs > grassland in the Shibing Karst, and forest > shrubs > cropland > grassland in the Libo-Huanjiang Karst. The implementation of a series of eco-logical protection projects and heritage site protection and management plans is the main reason for the improvement of regional ecological assets. Overall, this method can quickly and accurately assess the status and trends of ecological assets, guide ecosystem management within heritage sites, and provide effective solutions for ecological asset assessment in other karst world heritage sites.