LIU Haihong1,2, LIU Yinxun1,2, ZHANG Chunhua1,3, YANG Xuemei1, HU Jian4, LI Jun2
（1.College of Geography and Environmental Science, Tianjin Normal University, Tianjin 300387, China;
2.Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China；
3.Resources and Environmental Engineering, Ludong University, Yantai 264000, China;
4. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China ）
Abstract: Based on the Landsat TM/OLI image data of 1991, 2000, 2010 and 2016, the classification method of object-oriented and visual interpretation was used to extract the wetland information of the Yellow River Delta. In addition, spatial analysis, dynamics model, non-equidistance grey model sequences and other methods were applied to analyze the temporal and spatial variation of wetlands. On the basis of related literatures, this study discussed the driving factors of wetland change. The results show that from 1991 to 2016, the total area of wetlands in the Yellow River Delta decreased gradually, with a decrease of approximately 91.39 km2. Additionally, the area change during the period from 2000 to 2010 was most intense among the whole period. The area of natural wetlands decreased by 30.21 km2/a, while that of artificial wetlands increased by 32.77 km2/a. Among all wetland types, the area of meadow wetlands decreased, most severely, 312.83 km2, while the area of artificial wetlands increased significantly, mainly as aquaculture ponds and salt fields, with a total newly increased area of 544.63 km2. From the spatial distribution perspective, the area of artificial wetland in the study area has gradually expanded to the coastal area. Human activities such as wetland farming, agricultural reclamation, and engineering construction are the main factors leading to the reduction of natural wetlands in the Yellow River Delta.
Key words: wetland; Yellow River Delta; remote sensing monitoring; object-oriented classification
EARTH AND ENVIRONMENT Vol.46, No.6, Tot No.326, 2018, Page 590-598
