基于遥感分类的博鳌地区生态变化评价

利用不同年份TM 数据, 使用遥感和景观分析的评价方法, 并对博鳌镇及周边区域的生态安全状况进行了研究。在充分利用影像波段信息的基础上选取不同的波段组合, 对最大似然方法和光谱角分类法做对比分析, 并将对比的最优结果用于景观评价指数的计算, 运用土地利用转移概率矩阵以及多种景观指标对博鳌地区景观格局变化和各个斑块类型的变化进行了研究. 结果表明, 从1988 年到2000 年, 该地区的未利用地面积明显下降, 土地利用开发效果明显; 与此同时耕地面积也有一定规模的下降, 明显存在耕地被建筑用地挤占情况; 林地面积有很大的扩张, 显示出极大的优势度, 就研究区域整体景观而言, 该区的破碎度得到一定的改善, 但其物种多样性和均衡性遭到一定破坏。

The Ecological Assessment in Boao Region Based on RS Technology and Landscape Indices

Adopting technology in remote sensing and landscape ecology,the article took advantage of remote sensing data in different years to access the ecological security in Boao region.Based on the concept of making fully use of image information,the paper compared the classification result of different classification methods in different band combinations and used the better result in landscape analysis.Through computation of landscape indices of six counties,conclusion can be drawn that unused area in the region has decreased corruptly during the period of 1988 to 2000,which indicates the good effects of land use exploitation.The cultivated land area has also shrunk because there has distinct phenomenon of farmland occupied by building.On the other hand,the woodland has increased evidently.As far as the analysis on the landscape level,the landscape fragmentation of the region has been improved while the landscape diversity and the landscape equilibrium has been impaired.