摘要
为研究县域土地利用景观格局的变化,利用蕲春县1990年、2000年和2015年TM和OLI遥感影像,以归一化植被指数(NDVI,Normalized Difference Vegetation Index)、改进的归一化水域指数(MNDWI,Modified Normalized Difference Water Index)、归一化不透水面指数(NDISI,Normalized Difference Impervious Surface Index)、数字高程模型(DEM,Digital Elevation Model)等因子为基础,建立了不同地物(水域、耕地、林地、建设用地、未利用地)的分类规则,运用决策树分类方法获得蕲春县1990年、2000年和2015年三个时期的土地利用类型空间分布图,在此基础上建立了三个时期的土地利用转移矩阵,并对该地区土地利用的景观格局进行了分析。结果表明:近25年来,蕲春县土地利用类型发生了较大的变化,水域的面积从89.74km2增加为134.63km2,净增加了44.89km2;耕地从1086.79km2减少为1032.96km2,净减少了53.83km2;林地从1172.74km2减少到1138.94km2,净减少了33.8km2;建设用地从28.42km2增加为38.97km2,净增加了37.63km2;未利用地净增加了5.11km2,从16.38km2增加21.49km2。从景观破碎度、景观优势度和景观多样性与均匀性等方面的分析反映出蕲春县土地利用景观格局发生较明显的变化,景观的破碎度和多样性增大、耕地的优势度逐渐减小、林地的优势度逐渐增大,说明人类活动对土地利用的影响越来越大。
By use of 1990,2000,2015 TM and OLI images and on the basic of analysis for the parameters such as Normalized Difference Vegetation Index (NDVI),Modified Normalized Difference Water Index (MNDW),Normalized Difference Impervious Surface Index (NDISI) and Digital Elevation Model (DEM),the rules of classify for several land use types including Water,arable land,forest land,construction land and unused land were established. The quantitative and spatial distribution character of land use types during the three periods of Qichun County,Huanggang City,Hubei Province,China were obtained by using of decision tree classification method. And 7 landscape indexes were select to calculate the landscape pattern and its change from three levels of landscape fragmentation,landscape dominance index and landscape diversity. The results show that:(1) during the period of 1990 to 2015,the area of water and construction land increased by 44.89km^2 and 37.63km^2 respectively,and that of cultivated land,woodland and unused land decreased by 53.83km^2,33.80km^2,and 5.11km^2 respectively;(2) land use landscape fragmentation,diversity and evenness index increased,which reflected the influence of human activities on the land use type change increased;Dominance maximum conversed between cultivated land and forest land,which reflected the change of land use type mainly occurred between the cultivated land and forest land;(3) driving force factors of land use landscape pattern and its change were analyzed from the point of natural and man-made reasons.
作者
胡红兵
詹玉兰
Hu Hongbing;Zhan Yulan(School of Geography and Tourism,Huanggang Normal University,Huanggang,Hubei,438000,China;Library of Huanggang Normal University,Huanggang,Hubei,438000,China)
出处
《绿色科技》
2018年第24期200-205,共6页
Journal of Green Science and Technology
基金
湖北省普通高校人文社科研究基地大别山旅游经济与文化研究中心项目(编号:03201715503)
黄冈师范学院科研项目(编号:2013021903)
黄冈师范学院高级别培育项目(编号:201617703)
关键词
遥感影像
土地利用
决策树
转移矩阵
景观格局变化
RS images
land use
decision tree
transition matrix
landscape pattern change
