Journal of Marine Sciences ›› 2018, Vol. 36 ›› Issue (3): 57-66.DOI: 10.3969/j.issn.1001-909X.2018.03.006

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Analysis on the rules of spatial and temporal distribution of salt marsh in Yancheng coastal area over the past 30 years and its influencing factors

ZHENG Yu-jun1, SHI Lian-qiang*1, XU Dai-lu1,2,3, JIANG Zu-yin1, GUO Jun-li1,2,3   

  1. 1. State Research Centre for Island Exploitation and Management, Second Institute of Oceanography,SOA, Hangzhou 310012, China;
    2. Key Laboratory of Coastal and Island Development, Ministry ofEducation, Nanjing 210023, China;
    3. School of Geography and Ocean Sciences, Nanjing University,Nanjing 210023,China
  • Received:2018-02-02 Revised:2018-05-04 Online:2018-09-15 Published:2022-11-26

Abstract: Salt marsh is one of the major coastal wetland types in the world's temperate and subtropical regions. Taking Yancheng coastal area as an example and using 6 remote sensing satellite images of past 30 years, the temporal and spatial evolution of salt marsh in this area were analyzed by simple vegetation cover index (NDVI) crude extraction and visual interpretation. The influencing factors of these changes were also discussed. The results show that the area of salt marsh has risen and declined sharply at first and then risen slightly in the past 30 years, it has decreased about 18 km2 so far. The salt marsh continues to expand outward, the maximum expansion distance reaches 5.5 km. The width of the salt marsh has also changed over time, salt marsh vegetation types have also undergone different degrees of evolution. The landscape index shows that landscape fragmentation is getting worse. Mane, suaeda and reeds have decreased significantly, and plenty of spartina covers the wetland. Among the natural and human factors that affect the temporal and spatial changes of salt marshes, the effects of reclamation activities are the most pronounced.

Key words: salt marsh wetland, Yancheng coastal area, reclamation activity

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