基于最大似然分类的景观格局评价——以红寺堡灌区为例

利用遥感最大似然分类技术,采用景观指数评价红寺堡灌区的景观结构特征,分别从景观斑块、景观类型两个水平上以及利用转移矩阵分析了红寺堡1989、1999、2003、2008年4个时期的景观格局和动态变化。结果表明:采用最大似然分类法分类精度高,红寺堡灌区1989～2008年,在人为作用不断干扰下,景观格局变化显著,斑块数目增加,破碎度增大,均匀度减少,优势度增加,景观形状变得比较规则。在1989年的主要景观类型为草地,到2008年主要为沙地,这是人类活动直接影响的结果。

Landscape Pattern Evaluation Based on Maximum Likelihood Classification

By using maximum likelihood classification,several landscape indexes have been adopted to evaluate landscape structure of Guan District of Hongsibao Town,and landscape pattern and dynamic change of Hongsibao in 1989,1999,2003 and 2008 had been analyzed based on landscape patch,landscape type and transfer matrix.The results show that landscape pattern had changed obviously,patch’s number,fragmentation and dominance had increased,evenness had decreased,and landscape shape had become regular in Guan District of Hongsibao Town from 1989 to 2008.The primary landscape type of 1989 was grassland and of 2008 was sand,directly influenced by human activities.