摘要
在RS和GIS技术支持下,结合盐城自然保护区典型区域潮滩湿地的区域特点,通过景观多样性指数、优势度、聚集度指数、分布质心和转移矩阵等方法,系统地分析了1996-2010年的14年间盐城潮滩湿地互花米草(Spartina alterniflora)沼泽景观的时空动态及其对湿地景观空间格局的影响。结果表明:1盐城潮滩湿地互花米草沼泽分布面积呈显著增加趋势。1996-2010年,面积增长了2 661.74hm2,年均增长177.45hm2,增幅215.42%,年均变化率14.36%;2空间上,潮滩湿地上的互花米草斑块质心总体向海偏移。其中,1996-2006年,年均向海移动110.96m/a;2006-2010年,年均向海移动74.97m/a;3受互花米草扩张影响,研究区景观格局发生了明显的变化。互花米草生长不仅抑制了本地湿地植被的自然增长,而且还改变着湿地植被景观的组成、结构和潮滩湿地景观系统整体格局。
Using Thematic Mapper images acquired in 1996,2002,2006 and 2010 for the Core Area of Yancheng National Nature Reserve in Jiangsu,China we analyzed temporal and spatial changes in Spartina alterniflora landscapes and corresponding effects on the tidal flat environment combining remote sensing with geographical information systems. We used the landscape diversity index,aggregation index,distribution center of mass and transfer matrix method and found that S. alterniflora expansion changed the composition and structure of the landscape and affected the evolutionary process of this wetland. During 1996-2010,the area of S. alterniflora marsh increased by 2 661.74hm2,with annual growth of 177.45hm2 or 14.36%. The mass center of a patch moved0.013 degrees southeastward from 1996 to 2006:1 220.53 m to the east at an annual speed of110.96 m·a- 1. From 2006 to 2010,the mass center moved to the west 0.001 degrees or about24.65 m·a- 1. Significant changes have taken place in the S. alterniflora expansion area that inhibit the natural growth of local wetland vegetation and change the composition of wetland vegetation landscapes and the structure and pattern of the tidal flat wetland system. These data will aid the protection,utilization and management of S. alterniflora and coastal wetlands.
出处
《资源科学》
CSSCI
CSCD
北大核心
2014年第11期2413-2422,共10页
Resources Science
基金
国家自然科学基金项目:"基于生态过程的海滨景观演变动态模拟研究"(编号:41071119)
