摘要
收集了 1 988— 2 0 0 1年 1 2个时相的江苏盐城幅卫星影像 ,提取了双洋河口至梁垛河闸之间的互花米草盐沼 ;统计了不同时期的分布信息。分析表明 :①互花米草盐沼在江苏扩张非常迅速 ,到 2 0 0 1年 7月互花米草盐沼分布面积达 1 2 9 2 8km2 ,从射阳河口至梁垛河闸之间的潮间中上带泥滩大部分已被互花米草盐沼所覆盖 ;②由于生态位的影响 ,互花米草盐沼沿平行于海岸线方向的扩张速度快于垂直于海岸线方向的扩张速度 ;③依据野外调查和卫星影像分析 ,互花米草盐沼扩张可分为 3个阶段 :立地阶段、快速扩张期及成熟期。此外 ,还对互花米草盐的影响因素进行了探讨。
phases of TM,ETM+& SPOT satellite imageries from 1988 to 2001 are collected to extract distributing & area information of Spartina alterniflora Loisel saltmarsh extending from Shuangyang harbor to Liangduo Dam by using supervised classify method.By superimposing distributing map of Spartina alterniflora Loisel saltmarsh of different periods,we study the spreading process of Spartina alterniflora Loisel saltmarsh along Jiangsu coast,and some conclusions are drawn from these analusis.First,Spartina alterniflora Loisel saltmarsh had a fast spread speed,the area of Spartina alterniflora Loisel is 4 439 km^2 square kilometer in 1988,while it was 129 28 km^2 in July,2001,which is almost 30 times of 1988.High and middle intertidal flat is coverd by Spartina alterniflora Loisel saltmarsh form Sheyang Harbor to Liangduo Dam.Second,influenced by the niche of Spartina alterniflora Loisel saltmarsh,the expanding speed paralleling to the shoreline is larger than the speed vertical to the shoreline.Third,according to the like parabola,it has a low speed in the beginning,high in the rapid spreading period and descending in the mature period.Natural environment plays an important role in the Spartina alterniflora Loisel saltmarsh,and anthropogenic factors,such as reclamation project deeply affect Spartina alterniflora Loisel saltmarsh too.
出处
《海洋地质动态》
2004年第2期18-21,共4页
Marine Geology Letters
基金
江苏省政府"条子泥促淤并陆实验研究"项目资助
关键词
互花米草盐沼
生态环境
动态变化
江苏沿海地区
Spartina alterniflora Loisel saltmarsh,dynamic change
influence factors
Jiangsu coast
