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Spatiotemporal Dynamics of Coastal Wetlands and Reclamation in the Yangtze Estuary During Past 50 Years (1960s–2015)

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Abstract

Reclamation is one of the fastest-growing land use type developed in coastal areas and has caused degradation and loss of coastal wetlands as well as serious environmental problems. This paper was aimed at monitoring the spatiotemporal patterns of coastal wetlands and reclamation in the Yangtze Estuary during the 1960s and 2015. Satellite images obtained from 1980 to 2015 and topography maps of the 1960s were employed to extract changes of reclamation and coastal wetlands. Area-weight centroids were calculated to identify the movement trend of reclamation and coastal wetlands. The results show that from the 1960s to 2015, the net area of natural wetlands declined by 574.3 km2, while man-made wetlands and reclamation increased by 553.6 and 543.9 km2, respectively. During the five study phases, the fastest areal change rate natural wetlands was–13.3 km2/yr in the period of 1990–2000, and that of man-made areas was 24.7 km2/yr in the same period, and the areal change rate of reclamation was 27.6 km2/yr in the period of 2000–2010. Conversion of coastal wetlands mainly occurred in the Chongming Island, Changshu City and the east coast of Shanghai Municipality. Reclamation was common across coastal areas, and was mainly attributed to settlement and man-made wetlands in the Chongming Island, Lianyungang City and the east coast of Shanghai Municipality. Natural wetlands turned into farmlands and settlement, and man-made wetlands gained from reclamation of farmlands. The centroid of natural wetlands generally moved towards the sea, man-made wetlands expanded equally in all directions and inland, and the centroid of reclamation migrated toward Shanghai Municipality. Sea level rise, erosion-deposition changes, and reclamation activities together determine the dynamics of the Yangtze Estuary wetlands. However, reclamation activities for construction of ports, industries and aquaculture are the key causes for the dynamics. The results from this study on the dynamics of coastal wetlands and reclamation are valuable for local government to put forward sustainable land use and land development plans.

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Acknowledgments

The authors are grateful to the USGS and the Remote Sensing Data Sharing Center of China for providing Landsat data, and the colleagues who participated in the field surveys and data collection.

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Authors and Affiliations

  1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China

    Lin Chen, Chunying Ren, Bai Zhang, Zongming Wang & Kaishan Song

  2. University of Chinese Academy of Sciences, Bei**g, 100049, China

    Lin Chen

  3. Department of Earth Sciences, Indiana University-Purdue University, Indianapolis, 46202, USA

    Lin Li

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  1. Lin Chen
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  2. Chunying Ren
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  3. Bai Zhang
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  4. Lin Li
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Correspondence to Chunying Ren.

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Foundation item: Under the auspices of National Program on Key Basic Research Project (No. 2013CB430401)

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Chen, L., Ren, C., Zhang, B. et al. Spatiotemporal Dynamics of Coastal Wetlands and Reclamation in the Yangtze Estuary During Past 50 Years (1960s–2015). Chin. Geogr. Sci. 28, 386–399 (2018). https://doi.org/10.1007/s11769-017-0925-3

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