摘要
利用1963~2013年间14个时期的多源遥感影像提取绿洲信息,从退缩与扩张、区域变化差异及景观格局等方面分析了绿洲的时空变化过程。结果表明：绿洲在波动中显著扩张,50a间面积增加82.12%。绿洲扩张发生于绿洲-荒漠交错带以及内部复杂斑块之间,扩张方式以内部填充和渐进性外围延展为主;退缩则主要发生于绿洲-荒漠交错地带。绿洲变化存在明显的区域差异,不同区域不同时期绿洲的变化程度不同。绿洲景观斑块呈现分散-扩张-融合的动态变化特征,其形状趋于规则,破碎化程度下降,说明人类活动对绿洲景观的影响程度显著增强。
Applying multi - source remote sensing images of Linze County in the Hexi Corridor from 1963 to 2013 to extract the oasis in 14 typical periods, and using oasis contraction and expansion model, regional differ- ences model of oasis change, and landscape pattern, we analyzed comparatively the processes of spatio - tempo- ral changes in in recent 50a. The results show the development of Linze Oasis presented fluctuating but domina- ted by expansion, and the area of extend increased by 82.1% during 50a. Expanded oasis not only existed in oasis - desert ecotone but also in the inner complicated patches of oasis. The way of oasis expansion included the body internally filled expansion and progressively peripheral extension. Desertifieation existed only in oasis - des- ert ecotone. The characteristic of change of oasis had obvious regional differences, and degree of oasis change was different in times and regions. The degree of fragmentation of oasis landscape degree declined and it tended to be a simple shape as a whole, and the impact of human activities on oasis landscape was enhanced.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第8期55-60,共6页
Journal of Arid Land Resources and Environment
基金
兰州大学中央高校基本科研业务费专项资金(zujbky-2013-m02)
国家自然科学基金项目(No.91025010)
国家科技支撑计划项目(No.2012BAC19B09)
"973计划"项目"干旱区绿洲化
荒漠化过程及其对人类活动
气候变化的响应与调控(No.2009CB421306)资助
关键词
绿洲
绿洲化
时空变化过程
临泽县
oasis
oasisification
spatio - temporal processes
Linze county
