EVIDENCE FROM SATELLITE IMAGES OF HUMAN-RELATED ENVIRONMENTAL CHANGE IN GUIZHOU PROVINCE, CHINA 1991–1998
EVIDENCE FROM SATELLITE IMAGES OF HUMAN-RELATED ENVIRONMENTAL CHANGE IN GUIZHOU PROVINCE, CHINA 1991–1998
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DOI：
10.1080/10225706.2003.9684101
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
Honglin Xiao;G. A. Brook;C. Lo
中科院分区：
文献类型：
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作者：
Honglin Xiao;G. A. Brook;C. Lo
喀斯特地区约占世界陆地总面积的15%，居住着10多亿人口。喀斯特地区由于人类活动的影响，产生了许多环境问题。这些环境问题是严重的，独特的，需要紧急处理。虽然已经做了大量的研究，土地利用（LU）和土地覆盖（LC）变化检测使用卫星图像和地理信息系统，很少有集中在岩溶地区。以贵州省为例，研究了1991 ~ 1998年土地利用/土地覆盖变化对环境的影响。研究中使用了分别于1991年11月、1994年12月和1998年12月获得的三幅大地卫星TM图像。土地利用/覆盖分为五类：水、自然植被、农业、城市或建筑用地和荒地。在分类中使用了混合无监督/监督方法。为了达到更高的准确率，在原始的无监督分类中分配了120个类，然后将它们组合成5个类。基于从非监督分类获得的信息，400个站点，或从120个非监督类中的每个类中的大约3个站点，被仔细选择作为监督分类中的训练站点。研究表明，由于人类活动的影响，贵州省的土地利用和土地覆盖发生了显著变化。从1991年至1998年，农业用地继续减少;在此期间，城市面积急剧扩大;森林面积略有增加;荒地面积从1991年至1994年有所增加，但从1994年至1998年又有所减少。研究表明，喀斯特地区的经济发展、政府政策、规划、教育水平和生态系统脆弱性是其变化的主要驱动力。并对如何更好地进行土地利用规划和生态系统保护提出了一些建议。
Abstract Karst area accounts for about 15% of the total land area in the world, where over I billion people live. There are many environmental problems caused by human's activities in the karst area. These environmental problems are serious, unique, and need to be dealt with urgently. Although much research has been done on land use (LU) and land cover (LC) change detection using satellite images and GIS, little has focused on the karst area. This paper takes Guizhou Province, a typical karst area in China, as an example and studies the impact of land use and land cover on the environment for the period of 1991 to 1998. Three Landsat TM scenes, acquired in November 1991, December 1994 and December 1998 respectively, were used in the study. Land use/cover is classified into five categories: water, natural vegetation, agricultural, urban or built-up, and barren land. A hybrid unsupervised/supervised method is used in the classification. To achieve a higher accuracy, 120 classes are assigned in the original unsupervised classification, and then they are combined into 5 classes. Based on the information obtained from unsupervised classification, 400 sites, or about 3 from each of the 120 unsupervised classes, were carefully chosen as training sites in the supervised classification. The study suggests that Guizhou had experienced significant changes in land use and land cover due to human's activities. Agricultural land continued to decrease from 1991 to 1998; urban area expanded dramatically in that period; the area of forest increased slightly; the area of barren land increased from 1991 to 1994, but it decreased again from 1994 to 1998. The study indicates that the driving forces for the changes were the result of strong economy, governmental policies, poor planning, low educational level, and the nature of the fragile ecosystem in the karst area. Some recommendations are proposed for better land use planning and ecosystem protection there.