摘要
利用 198 7、1993和 1998年的遥感影像资料 ,研究了江汉平原洪湖湖区土地利用 /土地覆盖的时空变化 .土地覆盖类型分为水体、湖滩植被、洪泛地、农田、裸地和居民地 6类 .运用GIS(Arc/Info)软件 ,将不同时期的土地利用 /土地覆盖格局进行了清晰的空间表达 ;通过叠加 3个不同时段的影像分类图 ,计算出各种土地利用 /土地覆盖类型转变成其他类型的比例 .在 1987～ 1993年期间 ,水体和洪泛地的面积分别增加了 15 .5 4%和9.62 % ,而 1993～ 1998年期间这两种类型的变化较小 ,分别为 0 .5 8%和 3 .19% ;农田面积从 1987年的5 77 62km2 减少到 1998年的 188.5 8km2 ,减少约 2 /3 ;在研究期间 ,裸地面积没有明显变化 ;湖滩植被的面积在1987～ 1993年期间降低 18.60 % ,而在 1993～ 1998年期间增加 8.47% .土地利用 /土地覆盖状况的变化与湖区退田还湖及降雨状况的年际变化有关 .
Land use and land cover change can play a pivotal role in studies on environme ntal changes. The objective of this research was to identify changes in land cov er in Honghu Lake Region, Hubei Province, China. These changes were characterize d by using Landsat TM satellite imagery for periods 1987, 1993, and 1998 to unde rstand the dynamic of land cover over time. The land coverage was grouped into s ix types: water body, lake beach vegetation,flood plain,crop land, open land, an d settlement. By applying Geographical Information System (GIS), spatial pattern s of land cover in different stages were explored. By overlaying three classific ation maps, the percentage of each type of land cover converted into other categ ories was computed.The area of water body and flood plain increased by 15.54% an d 9 .62% respectively from 1987 to 1993, compared with a slight increase between 199 3 and 1998 by 0.58% and 3.19 % respectively. Crop land area consistently decr eased from 577.62km 2 in 1987 to 188.58km 2 in 1998, whilst no clear difference was shown in the area of open land during this period. The area of beach vegetation decreased by 18.60 % for the period 1987～1993 and then increased by 8.47% f or t he period 1993～1998. These changes observed during this study period may be rel ated to success of restoring natural lake area from forgiving cultivation, as we ll as impact of inter annual variation in rainfall characteristics.
出处
《应用生态学报》
CAS
CSCD
2001年第5期721-725,共5页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 4 680 1 )
世界自然基金会(WWF)资助项目 (CN0 0 79 0 9)
