Diagnosis of ecosystem health change in governing karst rocky desertification based on gridding GIS:A case in Huajiang demonstration area,Guizhou

Ecosystem health is the goal of ecological construction and comprehensive treatment of rocky desertification. Taking the demonstration area of rock desertification integrated management in Huajiang of Guizhou Province as an example, this work uses interpretation of remote sensing images, combining social investigation with hydrological and meteorological monitoring data, to establish a set of indicator frameworks for ecosystem health in such three aspects as the support system of natural resources, the support system of environment and the support system of society and economy. With support of the gridding GIS technology, this study gives each index in the diagnosis system the spatial expression of a 5m×5m grid scale. Subsequently, using the spatial overlaying technology based on grid data, we reveal the temporal dynamics and spatial pattern of ecosystem health huring the karst rocky desertification integrated management. The research results show that no area of good health exists in the Huajiang demonstration area. In the past 10 years, although the ecosystem health has been improved to some extent overall, most of the land remains unhealthy or sub-healthy, which accounts for 78.68% of total area. Regional differences appear in spatial distribution. The ecological system of peak cluster-depression is more healthy than the peak cluster steep slope, which is located in the northeast of the Huajiang demonstration area (higher than 1000 m above sea level).