The study on wetland landscape evolution of the Chaoyanggang Lagoon based on 3S technologies

On the basis of classification system of the landscape types of the Chaoyanggang Lagoon,the landscape patterns changes in different periods are analyzed quantitatively through 3S technologies.The results show that the area of the artificial landscapes is increased by 532 hm² from 1954 to 2002.The land scape diversity index and the landscape evenness index increase and the landscape dominance index decrea ses.At the same time,the patch density of the lagoon increases from 0.017 9 to 0.034 6 ind./hm²,the corridor density increases from 0.695 4 to 22.056 4 m/hm²,which shows that the fragmentation level is increased since 1954.The landscape patterns changes of the Chaoyanggang Lagoon are closed related to human activities on the landscape,so adjusting the in ensity of human development reasonably is very important to protect lagoonal wetland resources effectively.