Mining spatial information to investigate the evolution of karst rocky desertification and its human driving forces in Changshun, China

• Published in: The Science of the total environment Vol. 458-460; pp. 419 - 426
• Main Authors: Xu, Erqi, Zhang, Hongqi, Li, Mengxian
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-08-2013
• Subjects: China; Conservation of Natural Resources - methods; Data Mining; Fine scale; Geological Phenomena; Human Activities - economics; Human driving forces; Humans; Karst rocky desertification; Models, Theoretical; Spatial technique; Standard coefficient of influence; China; China, People's Rep; Standard coefficient of influence; Spatial technique; Karst rocky desertification; Human driving forces; Fine scale
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2013.04.048

The processes of karst rocky desertification (KRD) have been found to cause the most severe environmental degradation in southwestern China. Understanding the driving forces that cause KRD is essential for managing and restoring the areas that it impacts. Studies of the human driving forces of KRD are limited to the county level, a specific administrative unit in China; census data are acquired at this scale, which can lead to scale biases. Changshun County is studied here as a representative area and anthropogenic influences in the county are accounted for by using Euclidean distances for the proximity to roads and settlements. We propose a standard coefficient of human influence (SOI) that standardizes the Euclidean distances for different KRD transformations to compare the effects of human activities in different areas. In Changshun County, the individual influences of roads and settlements share similar characteristics. The SOIs of improved KRD transformation types are almost negative, but the SOIs of deteriorated types are nearly positive except for one form of KRD turning to the extremely severe KRD. The results indicated that the distribution and evolution of the KRD areas from 2000 to 2010 in Changshun were affected positively by human activities (e.g., KRD restoration projects) and also negatively (e.g., by intense and irrational land use). Our results demonstrate that the spatial techniques and SOI used in this study can effectively incorporate information concerning human influences and internal KRD transformations. This provides a suitable approach for studying the relationships between human activities and KRD processes at fine scales.
•The Changshun showed a trend of overall improvement with local deterioration.•Human activities were associated with the distribution and the evolution of the KRD.•Improved and deteriorated KRD transformations show opposite SOIs' characteristics.•The spatial technique and SOI incorporated the information of human influence.•Our method can study the relationship between human activities and KRD in fine scale.