Analysis of the expanding process of the Spartina alterniflora Loisel salt marsh on Jiangsu Province coast by remote sensing

Abstrcat \%Spartina alterniflora \%Loisel is introduced from the U.S.A. to China and it is a new kind of plant to Chinese environment. There has come into being large area of \%S. alterniflora \%salt marsh on Jiangsu Province coast since the planting of \%S. alterniflora \%in 1982. By distinguishing the several remote sensing pictures of TM made in past several years, the expanding process of \%S. alterniflora \%salt marsh on Jiangsu Province coast was analyzed. The results show that the average annual expanding rate of \%S. alterniflora \%salt march is 23.4% in the early time, 89% in the middle time, and 48% in the latter time. The distributing picture was drawn combining with the field investigation. Finally, the influence of \%S. alterniflora \%on vegetation succession of Jiangsu Province coast was also discussed.