›› 2013, Vol. 23 ›› Issue (4): 753-768.

• Research Articles •

### Driving forces analysis of reservoir wetland evolution in Beijing during 1984-2010

GONG Zhaoning, LI Hong, ZHAO Wenji, GONG Huili

1. Base of the State Laboratory of Urban Environmental Processes and Digital Modeling;Key Laboratory of 3D Information Acquisition and Application of Ministry;Key Laboratory of Resource Environment and GIS of Beijing;College of Resource Environment &|Tourism, Capital Normal University, Beijing 100048, China
• Received:2013-01-16 Revised:2013-03-20 Online:2013-08-15 Published:2013-08-26
• Contact: Li Hong, Master, E-mail: Li.1006.cool@163.com E-mail:Li.1006.cool@163.com
• About author:Gong Zhaoning (1976-), Ph.D and Associate Professor, specialized in remote sensing technology in the application of wetland environment change, E-mail: gongzhn@163.com
• Supported by:

Youth Found of National Natural Science Foundation of China, No.41101404;National 863 Project, No.2012AA12A308;Basic Surveying and Mapping Project, No.2011A2001;Key Laboratory Project Ministry of Land and Resources, No.KLGSIT2013-04

Abstract:

The reservoir wetland, which is the largest artificial wetland in Beijing, constitutes one of the important urban ecological infrastructures. Considering two elements of natural environment and socio-economy, this paper established the driving factor indexing system of Beijing reservoir wetland evolution. Natural environment driving factors include precipitation, temperature, entry water and groundwater depth; social economic driving factors include resident population, urbanization rate and per capita GDP. Using multi-temporal Landsat TM images from 1984 to 2010 in Beijing, the spatial extent and the distribution of Beijing reservoir wetlands were extracted, and the change of the wetland area about the three decade years were analyzed. Logistic regression model was used to explore for each of the three periods: from 1984 to 1998, from 1998 to 2004 and from 2004 to 2010. The results showed that the leading driving factors and their influences on reservoir wetland evolution were different for each period. During 1984-1998, two natural environment indices: average annual precipitation and entry water index were the major factors driving the increase in wetland area with the contribution rate of Logistic regression being 5.78 and 3.50, respectively, and caused the wetland growth from total area of 104.93 km2 to 219.96 km2. From 1998 to 2004, as the impact of human activities intensified the main driving factors were the number of residents, groundwater depth and urbanization rate with the contribution rate of Logistic regression 9.41, 9.18, and 7.77, respectively, and caused the wetland shrinkage rapidly from the total area of 219.96 km2 to 95.71 km2. During 2004-2010, reservoir wetland evolution was impacted by both natural and socio-economic factors, and the dominant driving factors were urbanization rate and precipitation with the contribution rate of 6.62 and 4.22, respectively, and caused the wetland total area growth slightly to 109.73 km2.