Acta Geographica Sinica ›› 2015, Vol. 70 ›› Issue (1): 17-28.doi: 10.11821/dlxb201501002

• Orginal Article • Previous Articles     Next Articles

The changes and dynamics of coastal wetlands and reclamation areas in central Jiangsu from 1977 to 2014

Jianguo LI1, Lijie PU1,2, Caiyao XU1, Xinjian CHEN1, Yunfeng ZHANG3, Fangfang CAI1   

  1. 1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
    2. The Key Laboratory of the Coastal Zone Exploitation and Protection, Ministry of Land and Resources, Nanjing 210023, China
    3. School of Urban and Resource Environment, Yancheng Teacher's University, Yancheng 224051, Jiangsu, China
  • Received:2014-10-13 Revised:2014-11-05 Online:2015-01-20 Published:2015-06-17
  • Supported by:
    National Natural Science Foundation, No.41230751;The Program A for Outstanding PhD Candidate of Nanjing University, No.2014001A004;The Scientific Research Foundation of Graduate School of Nanjing University, No.2012CL14]

Abstract:

Five remote sensing images (1977, 1984, 2000, 2007 and 2014) were obtained to study the spatial dynamics of coastal wetlands and reclamation area in central Jiangsu province. The results indicated that most of the coastal wetlands showed an accretion trend from the south of Sheyang estuary, while there still existed some erosion phenomena in the past 40 years. The mean rate of accretion/erosion of Jiangsu coastal wetlands was ±20 m per year, and the highest value was observed at Dongtai and Yangkou ports. Meanwhile, the reclamation rate was significantly higher than the accretion ones, and the former kept a level of 50 m per year. In addition, the key ecological areas of Jiangsu coastal wetlands reduced rapidly from 1977 to 2014, which can be found from the shrinkage of natural halophytic vegetation in the southern part of Sheyang County and the whole part of Dafeng County. It was found in field surveys that the evolution pattern of reclamation in coastal wetlands was in the order of bare flat → halophytic vegetation → aquaculture pond → cropland → built-up land. However, with the aid of new technology, the period of evolution pattern was shortened. Moreover, the development of coastal wetlands has been intensified due to reclamation activities. The hotspots of reclamation were presented at major ports and central towns.

Key words: coastal wetland, reclamation pattern, expanding/erosion, evolution path, Jiangsu