Abstract:

To fully understand the trend and drivers of lake water area change in Dalinor Nature Reserve (DNR), this study based on the remote sensing image from 1983 to 2018 in the DNR, extracted water bodies by adopting supervision classification and visual interpretation methods, and studied the dynamic changes and drivers of lake water area in the DNR. The results showed that the total lake water area in DNR decreased by 31.56 km² from 1983 to 2018, with an average change rate of -0.9 km²/a, accounting for 13% of the total area; among them, the Dalinor Lake water area showed a downward trend, with a total decrease of 34.23 km², and an average change rate of -0.98 km²/a, while the Ganggeng Lake water area increased by 2.67 km², with an average change rate of 0.08 km²/a. The water in the east, west and northeast directions of the Dalinor Lake were shrinking; the water in the east, northeast and southwest directions of Ganggeng Lake were in an expansionary state. The analysis of the dynamic change drivers of lake water area in the DNR show that the changes of lake water area in the study area are mainly related to warming temperature, decreasing precipitation and significant human activities (tourism, animal husbandry and aquaculture, etc.).

Key words: Dalinor Lake, lake water area change, visual interpretation, climatic factors, human factors