Landscape Pattern Changes in Alpine Wetland of Bayanbulak Swan Lake during 1996-2015

doi:10.31497/zrzyxb.20171041

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JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (11) : 1897-1911. DOI: 10.31497/zrzyxb.20171041

Resource Ecology

Landscape Pattern Changes in Alpine Wetland of Bayanbulak Swan Lake during 1996-2015

XU Xiao-long, WANG Xin-jun, ZHU Xin-ping, JIA Hong-tao, HAN Dong-liang

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Abstract

The changes in landscape pattern of alpine wetland ecosystem, one of the special ecosystems in arid areas, attracted global attentions. The objective of this study was to analyze the landscape pattern changes and the relationship between the changes and climate factors in the alpine wetland of Bayanbulak Swan Lake during 1996-2015. Five remote sensing images, including three TM images in 1996, 2006 and 2010, one ETM image in 2000 and one OLI image in 2015 were used. Results showed that: 1) The area of the wetland decreased by 5.62% during 1996-2015 with a loss rate of 1.91 km²/a. The changes of the wetland area can be divided into two periods by 2010. The changes were very small before 2010 and the percentage of wetland area in Bayanbulak Swan Lake ranged from 77.24% to 78.26%. After 2010, the wetland area continued decreasing at a low speed and the area decreased by 5.28%. 2) At the landscape level, the landscape fragmentation and the spatial heterogeneity increased during 1996-2015. At the same time, the shape of patches tended to be complex. At the class level, the fragmentation of wetland patches increased and the shape of patches tended to be complex. 3) Average daily maximum air temperature had much greater effect on the landscape pattern changes in Bayanbulak Swan Lake wetland than average annual precipitation. The area of the wetland tended to be stable with the increase of the daily maximum temperature and the changes of fragmentation degree were not obvious when the daily maximum temperature was below 18.7 ℃. In contrast, the area of wetland decreased and the fragmentation increased with the increase of the daily maximum temperature when the daily maximum temperature was over 18.7 ℃. These results indicated that the wetland in Bayanbulak Swan Lake degraded and the environment of the wetland became worse during 1996-2015.

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alpine wetland / climate factor / remote sensing / wetland landscape pattern

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XU Xiao-long, WANG Xin-jun, ZHU Xin-ping, JIA Hong-tao, HAN Dong-liang. Landscape Pattern Changes in Alpine Wetland of Bayanbulak Swan Lake during 1996-2015[J]. JOURNAL OF NATURAL RESOURCES, 2018, 33(11): 1897-1911 https://doi.org/10.31497/zrzyxb.20171041

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