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Wetland Transitions and Protection under Rapid Urban Expansion: A Case Study of Pearl River Estuary, China

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  • Hui Zhao

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China)

  • Xiaodan Wang

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China)

  • Yanjiang Cai

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China)

  • Weilong Liu

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China)

Abstract

Understanding wetland changes under urbanization is important for wetland management. In this study, net transition intensity (NTI) and total transition intensity (TTI) are presented to characterize wetland transitions based on spatial data obtained from Landsat satellite images of Pearl River estuary in South China. NTI is commonly used to represent changes in absolute amounts for each class of wetland, while TTI reflects the internal transition activities and amounts. The third index, the urbanization intensity index (UII), is used to investigate the intensity and velocity of urban land expansion at the same time periods. The results show that one-third of the total wetland area was lost from 1979 to 2009 in the study area and seven types of estuarine wetlands were degraded. The basic pattern of wetland transition is from natural wetlands to constructed wetlands and then to urban lands. Intertidal mud and sand and paddy fields were the major natural and constructed wetlands, respectively, transferred to urban lands. The TTI value was generally greater than the NTI value for these wetlands. TTI >> NTI is an important indicator for wetland transitions under rapid urban expansion in the Pearl River estuary. Based on the integration of the two indices (NTI and TTI), a protection and management plan framework for the Pearl River estuary wetlands is proposed. This plan emphasizes the key and important zones and their different features, and includes actions that can be implemented in and around natural and constructed wetlands.

Suggested Citation

  • Hui Zhao & Xiaodan Wang & Yanjiang Cai & Weilong Liu, 2016. "Wetland Transitions and Protection under Rapid Urban Expansion: A Case Study of Pearl River Estuary, China," Sustainability, MDPI, vol. 8(5), pages 1-15, May.
    • Handle: RePEc:gam:jsusta:v:8:y:2016:i:5:p:471-:d:69910
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    References listed on IDEAS

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    1. Duan, L.J. & Li, S.Y. & Liu, Y. & Moreau, J. & Christensen, V., 2009. "Modeling changes in the coastal ecosystem of the Pearl River Estuary from 1981 to 1998," Ecological Modelling, Elsevier, vol. 220(20), pages 2802-2818.
    2. Yushuo Zhang & Lin Zhao & Jiyu Liu & Yuli Liu & Cansong Li, 2015. "The Impact of Land Cover Change on Ecosystem Service Values in Urban Agglomerations along the Coast of the Bohai Rim, China," Sustainability, MDPI, vol. 7(8), pages 1-23, August.
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    Cited by:

    1. Tianlin Zhai & Jing Wang & Ying Fang & Jingjing Liu & Longyang Huang & Kun Chen & Chenchen Zhao, 2021. "Identification and Prediction of Wetland Ecological Risk in Key Cities of the Yangtze River Economic Belt: From the Perspective of Land Development," Sustainability, MDPI, vol. 13(1), pages 1-17, January.
    2. Zhiwei Wan & Hongqi Wu, 2022. "Evolution of Ecological Patterns of Poyang Lake Wetland Landscape over the Last One Hundred Years Based on Historical Topographic Maps and Landsat Images," Sustainability, MDPI, vol. 14(13), pages 1-17, June.

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