江苏沿海互花米草(Spartina alterniflora Loisel)盐沼扩展过程的遥感分析

互花米草(SpartinaalternifloraLoisel)自1982年在江苏沿海栽种以来,在江苏沿海已形成了大片互花米草盐沼。本文通过对历年TM卫星相片上互花米草盐沼的识别、判读及统计,认为江苏沿海互花米草盐沼的年扩展速度在早期较慢,仅为23 4%,中期较快为89%,后期又减慢为48%。结合野外调查,绘制出了江苏沿海互花米草的分布图。此外,就互花米草盐沼对江苏沿海湿地植被演替的影响进行了讨论。

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

%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.