Study on ecological restoration of Dujiangyan after “5•12”

Abstract:

This study comprehensively considers topographic factors such as elevation, slope, ecosystem service factors, biodiversity and water conservation, to comprehensively and quickly evaluate the recovery effect of postdisaster ecosystems and explore new methods for ecological restoration assessment after earthquakes. Taking the ecological restoration of Dujiangyan in the “5.12” Wenchuan earthquake as an example, the key ecological problems caused by earthquakes and secondary disasters were integrated, and the spatial pattern of key ecological land was established. The results show that compared with 2005, the total area of ecological land decreased by 12.88 km2 in 2011. The land use types before and after the earthquake have an obvious transfer to construction land. The importance of key ecological land use rate is geological disaster＞water conservation＞Diversity. From the results analysis, in the third year after the earthquake, the indicators of biodiversity, water conservation, and geological disasters have been restored and exceeded the preearthquake. Most of the losses are in the northwest of Dujiangyan, where landslides and mudslides occur frequently.