基于RS与GIS的伶仃洋两岸土地利用时空演化分析

Land Use Changes in Coastal Area along the Lingdingyang Sea Based on GIS and RS

以LandsatTM影像为基础,通过遥感解译得到4期土地利用数据。对珠江口伶仃洋两岸土地利用的数量、类型及时空演化特征分析发现:(1)在1990-2005年期间,研究区建设用地快速扩张,15年间净增2256.38km2,年均增长150.43km2/a;耕地净流失量达1457.73km2,年均流失为97.18km2/a;林地年均流失31.70km2/a。(2)从研究区综合动态度看,1990-1995年是研究区土地利用变化激烈时段;从各市综合动态度看,深圳、珠海与东莞前期变化大,番禺与中山则后期变化较强。(3)研究区各市土地利用变化强度差异明显。

Using GIS and RS techniques, Landsat TM images in 1990, 1995, 2000 and 2005 are analyzed to identify spatial-temporal changes of land use/cover in the coastal area along the Lingdingyang Sea. The results show： firstly, built-up land have expanded rapidly in 1990--2005, and the net increase was 2 256.38 km^2, and the annual average increase was 150.43 km^2/a. Farmland and forestland have had a significant loss, with farmland losing about 1 457.73 km^2 or an annual average loss of 97.18 km^2/a, and forestland losing 31.70 km^2/a. Secondly, in order to assess the intensity of land use change, integrated dynamic index is adopted. The results indicate that land use change was much more intensive in 1990--1995. However, different cities show varying patterns of land-use change intensity. In Shanzhen, Zhuhai and Dongguan it was more intensive in the earlier stage, while in Zhongshan and Panyu it was more intensive in the latter period. Finally, relatively change ratio index is used to illustrate the difference of land use change in the study area. That of farmland change in Dongguan was biggest in 1990--2000; yet in Shenzhen the change was greater in 1990--1995. The further research should examine the driving mechanism of the land use change.