Abstract:

In order to know the changing situation of Beijing wetland resources nearly 20 years, and the trend features in future, the author used CA-MARKOV model to analyze wetland resources changes in Beijing. The constraint condition, model parameter, transition rules (including research area precipitation, temperature, humidity and DEM) of model were determined based on wetland classification results of 1992, 2002, 2007, 3 remote sensing image data. Step features of 5 years and 15 years were identified , used to predict the 2012 and 2022 spatial-temporal characteristics in wetland of Beijing. The results of this study showed that wetland area of Beijing was total to 48402.8 hm2 in 2012. It was reduced 7.38% from 2007 to 2012, with an average annual reduction rate of 1.47%.The area of wetland was continuing to decline in 2022.