干旱区研究

Arid Zone Research >

2021 , Vol. 38 >Issue 6: 1771 - 1781

DOI: https://doi.org/10.13866/j.azr.2021.06.29

Ecology and Environment

Landscape pattern evolution and its influencing factors of alpine wetland in Yanchi Bay

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  • College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, Gansu, China

Received date: 2021-02-09

  Revised date: 2021-04-02

  Online published: 2021-11-29

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Abstract

Alpine wetlands are an important water conservation and biodiversity resource. Studying the evolution of wetland landscape patterns and its driving factors helps understand the unique functions, evolutionary processes, and environmental impact mechanisms of the wetland ecosystem. Using six periods of Landsat remote sensing image data from 1989 to 2019, combined with GIS technology, landscape pattern indices, and correlation analysis, this study analyzed temporal and spatial evolution of alpine wetland landscape patterns in Yanchi Bay. The results showed that (1) the total area of Yanchi Bay wetland showed an increasing trend from 1989 to 2019. The swamp meadows, permanent rivers, and inland salt marshes increased by 31.02%, 17.53%, and 3.77%, respectively, and herbaceous marshes and naked spots decreased 54.28% and 9.5%, respectively. (2) For wetland types, fragmentation of permanent rivers and swamp meadows decreased from 1989 to 2019 and fragmentation of other types of wetlands increased. At the landscape level, wetland shape was simplified, while the degree of wetland fragmentation increased, the spread and Shannon’s diversity index decreased, and wetland landscape distribution developed evenly. (3) Further, there was a differential correlation among temperature and precipitation, wetland area, and landscape pattern index. Climate change was a key factor leading to changes in the area of the alpine wetland and evolution of landscape patterns in Yanchi Bay. Studying dynamic evolution characteristics from time series of the alpine wetland landscape has important theoretical significance for understanding ecological functions and ecological processes, as well as practical significance for sustainable development of wetlands and landscape planning and management.

Key words： landscape index; wetland landscape pattern; Yanchi Bay; spatial-temporal evolution; alpine wetland

Cite this article

ZENG Hongxia,ZHAO Chengzhang,WANG Yufang,LI Xiaoya,ZHAO Tingting,TANG Yurui . Landscape pattern evolution and its influencing factors of alpine wetland in Yanchi Bay[J]. Arid Zone Research, 2021 , 38(6) : 1771 -1781 . DOI: 10.13866/j.azr.2021.06.29

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