基于SPOT5的岱山岛沿海防护林动态监测

摘要

Changes of coastal protective forest in Daishan Island of Zhejiang province were determined based on SPOT 5 imagery in 2003 and 2011. The result demonstrated that the accuracy of object-oriented classification approach for the forests topped to 85.2%with Kappa coefficient of 0.81. The result indicated that in 2011, coastal protective forest in Daishan was dominated by mixed forest(75%), followed by evergreen broad-leaved forest(10%)and coniferous forest(4%). During 2003-2011, the areas of evergreen broad-leaved and coniferous forest reduced by 50%and 22%, while that of mixed forest increased by 20%.%利用2003年、2011年两期SPOT5遥感数据，对岱山岛沿海沿海防护林的现状和近8年来的动态进行遥感监测。结果表明：面向对象分类方法的沿海防护林分类精度达85.2%，kappa系数为0.81；2011年，岱山岛沿海防护林主要以混交林为主，其次是常绿阔叶林和针叶林，分别占75%、10%和4%；2003-2011年，岱山岛的常绿阔叶林和针叶林面积分别减少50%和22%，而混交林面积增加20%，部分防护林开发为建筑用地，沙质海岸新增木麻黄（Casuarina equisetifolia）防护林带。