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Invading cord grass vegetation changes analyzed from Landsat-TM imageries: a case study from the Wanggang area, Jiangsu coast, eastern China

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Abstract

Cord grass colonization on the Jiangsu coast, eastern China, modifies the native salt marshes in terms of ecosystem structure. The Landsat TM images from 1992 to 2003 were analyzed to identify salt-marsh vegetation distribution patterns and their changes over this coastal region, in order to evaluate the effects of the spreading of the artificially introduced halophyte Spartina. Supervised classification was performed using Bands 3, 4 and 5 in conjunction with in situ training samples, to derive the distribution pattern of the vegetation in the study area. Further, in order to identify the intertidal areas with different tidal elevations, a data treatment procedure was designed to combine regional water level data using harmonic analysis with the waterlines on the TM images extracted by density slice. The results show that: (1) the Spartina alterniflora area has been expanding towards the sea rapidly since it was introduced, especially at initial stages; (2) in the upper part of the inter-tidal zone, the local marsh plant Suaeda salsa and the exotic species Spartina anglica were present only near the sea dyke, occupying only a small part of the entire salt marsh, and the area of these two species has been reduced by land reclamation; (3) there has been a trend for Spartina alterniflora to become the dominant species in the salt marshes in the study area; and (4) the elevation of Spartina alterniflora’s seaward fringe was close to mean high water on neaps, and its landward boundary was slightly higher than mean high water. The salt marsh environment of the study area has been modified rapidly by the Spartina vegetation for the last 12 years.

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Coastal and Island Development, Nanjing University, Nanjing, 210093, China

    Jing Li, Shu Gao & Yaping Wang

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  1. Jing Li
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  2. Shu Gao
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  3. Yaping Wang
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Correspondence to Jing Li.

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Foundation item: The National Natural Science Foundation of China under contract Nos 40476041 and 40576040; the Ministry of Science and Technology of China under contract No. 2006CB708410.

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Li, J., Gao, S. & Wang, Y. Invading cord grass vegetation changes analyzed from Landsat-TM imageries: a case study from the Wanggang area, Jiangsu coast, eastern China. Acta Oceanol. Sin. 29, 26–37 (2010). https://doi.org/10.1007/s13131-010-0034-y

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  • DOI: https://doi.org/10.1007/s13131-010-0034-y

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