基于TM数据的广州市番禺区土地覆被格局分析

以覆盖番禺区1990年、1995年、2000年、2005年4个时相Landsat-TM影像为主要数据源,借助GIS手段和景观生态学方法生成土地覆被图。在数量化研究LUCC的基础上,借助景观格局指数反映番禺区4个时相土地覆被的变化机制,对土地覆被景观格局生态效应研究提供依据。研究表明:番禺区的土地利用结构在1990~1995年间处于开发调整时期,2000年后土地利用结构调整趋于成熟,土地覆被变化伴随着城市化的进程趋于平缓。研究时期内,番禺区的景观破碎度增加,土地利用结构的复杂程度也在增加,人为因素导致的土地覆被类型变化的影响逐渐替代自然作用下土地覆被类型情况。

Land Cover Patterns in Panyu Based On TM Image

Based on 1990,1995,2000,2005 Landsat-TM images in Panyu District of Guangzhou City as the main data source,GIS tools and Landscape Ecology methods were used to generate land cover landscape maps.On the basis of the quantitative study of LUCC,land cover change mechanism during the study period in Panyu District was reflected by landscape pattern indices,providing research basis for the effects of land cover on landscape pattern and its ecological effects.The result showed that the land use structure of Panyu District represented a period of development and adjustment from 1990 to 1995,and tends to become mature situation after 2000.The structure of land cover changed showed maturity along with the process of urbanization.The landscape fragmentation and the complexity of land use structure increased.The effects of human-induced land cover change gradually replaced the natural role in affecting land cover type.From the quantity of land use change from 1990 to 2005,land use change accompanied by urbanization and farmland quantitative changes are the largest in Panyu District.And as followed by construction land and garden,water changes are also significant.Farm land and garden are reduced while the other land type increased.Human factors induced land-cover changes played a growing role while the effect of natural factor was decreasing.The structure of agriculture and people’s lifestyles are changing rapidly.The rates of land-use change rank as follows: green fields > transportation land> shrub grassland> building >garden> arable land = water.As shown in landscape changes,arable land,garden,forest land and building land have increasing patch fragmentation especially agricultural land,garden,lawn irrigation,etc.And the expansion of construction land area led to increasing degree of concentration.In addition to garden,the other land type also increases the complexity of the class.