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Publication Type J
Authors Li, J., S. Gao and Y. P. Wang
Title Invading cord grass vegetation changes analyzed from Landsat-TM imageries: a case study from the Wanggang area, Jiangsu coast, eastern China
Source Acta Oceanologica Sinica
Author Keywords tidal flats salt marshes remote sensing vegetation cover Jiangsu coast multitemporal satellite images suspended sediment transport spartina-alterniflora salt-marshes waterline extraction intertidal sediments cordgrass spartina grain-size tidal flat plantations
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.
Author Address [Li, J; Gao, S; Wang, YP] Nanjing Univ, Key Lab Minist Educ Coastal & Isl Dev, Nanjing 210093, Peoples R China Nanjing Univ, Key Lab Minist Educ Coastal & Isl Dev, Nanjing 210093, Peoples R China jessylee@vip.sina.com
ISSN 0253-505X
ISBN 0253-505X
29-Character Source Abbreviation Acta Oceanol. Sin.
Publication Date May
Year Published 2010
Volume 29
Issue 3
Beginning Page 26-37
Digital Object Identifier (DOI) 10.1007/s13131-010-0034-y
Unique Article Identifier WOS:000279357100004
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