Spatiotemporal dynamic characteristics of lake resource evolution in Jilin Province from 1985 to 2015
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Abstract:
The object-oriented classification method is uttlized for Landsat remote sensing imagery and obtain spatial distribution maps of lakes in Jilin Province during the 30 years ( from 1985 to 2015) . The temporal and spatial dynamic characteristics of lake evolution are sy stematically analyzed using GIS through time dynamic index, spatial distribution vector density index, and multiple landscape indexes. The results show that: The area of lakes in Jilin Province showed a shrinking trend in 30 years. The area has decreased from 2 667. 12 km2 to 2 131. 25 km2, respectively. The number of lakes has decreased by 72, with a reduction ratio of 13. 74% . Lake resources in Jilin Province are mainly small lakes ( θ< 10 km2 ) , accounting for more than 90% . The number of lakes in different sizes has decr eased in 30 years, of which 63 small lakes have decr eased, accounting for 13.04% . The spatial distribution vector density shows that the distribution of lake resources in Jilin Province presents different characteristics in different regions. The lake resources in the east are scarce and have the lowest density index . The number of lakes has increased by 10.39% , but the total area has decreased by 10. 83 km2 . The lake resources in the west are rich and mainly small lakes. The number and area of lakes in 30 years have decreased significantly. The ar ea has decreased by 266. 85 km2 and the number has decreased by 25. 54% , respectively. The lake resources in the central region fluctuate greatly. The area has decreased by 237.75 km2 and the number has decreased by 5.33% .
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