Dynamical Monitoring of Spartina alterniflora Loisel Invasion Using Remote Sensing Data in Beihai, Guangxi

摘要

Spartina alterniflora Loisel was introduced to Beihai in 1979 because it accelerates sediment accretion and can act as a seawall. However, this species have grown in mangrove protected areas with large area", and it threatened the local mangrove and mudflat ecosystem. To obtain the distribution and trends of Spartina alterniflora Loise, we collected the high-spatial-resolution remote sensing imagery of 2009 and 2011. Through the field survey, the imagery signs of this species in different growth stages were established. Through human-computer interaction, the distribution of Spartina of 2009 and 2011 was mapped in Beihai, Guangxi. The area of this species was 300 ha and 357.2 ha respectively in 2009 and 2011, and it expanded more obviously in east-to-west direction.