OALib Journal期刊
ISSN: 2333-9721
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伊洛河流域典型地区森林景观格局动态
DOI: 10.11821/xb200303004, PP. 354-362
Keywords: 森林景观,地貌类型区,伊洛河,洛宁
Abstract:
以野外调查资料和1983~1999年森林资源分布图为主要信息源,用ARC/INFO作为空间信息处理工具,采用斑块数、平均斑块面积、破碎化指数、斑块伸长指数、分数维、稳定度等指标分析了近20年来伊洛河流域中部典型地区的森林景观格局动态。结果表明,(1)研究区内森林总面积在增加,斑块数量迅速增大,由556块增至1494块。其中以刺槐林、经济林和杨树林斑块数量增加最多。景观破碎化程度明显加大。(2)森林景观要素中灌木林、刺槐林、经济林、杨树林、栎林等斑块的面积有所增加,而非林地、荒草地、疏林、油松林等斑块的面积有所减小;除杨树林外,各森林类型斑块的平均面积都在减小。(3)研究区内沟谷植被覆盖面积共减少了220827.9hm2;丘陵森林覆被面积由1983年的161870.4hm2增加到1999年的312599.7hm2,增加了93.1%;斑块数目由79块增加到758块,增加了860%。而丘陵地区斑块平均面积却大大减小;山地森林覆被面积有所减少,由1983年的375348.6hm2减小到1999年的338733.9hm2,而斑块数却大幅度增加,由1983年的432块增加到1999年的1127块,增加了695块。(4)研究区南北山坡森林景观格局变化明显不同,这与南北坡土地类型不同、人类活动方式不同和地形地势的差别有关。
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