摘要
以1986-2015年的7期Landsat TM/OLI影像为数据源,在遥感及地理信息系统技术的支持下,采用改进的归一化差异水体指数提取黑河干流中游各年份的水域湿地信息,从面积变化、空间分布和形状变化分析其时空变化特征.结果表明,黑河干流中游地区水域湿地近30 a来发生了明显的萎缩, 2000年之前水域湿地萎缩较为剧烈,之后趋于平缓;研究区西北部由于受人类活动和上游来水量大小的影响,水域湿地容易反复变化,中部和西南部由于农业开垦过甚,水域湿地持续萎缩;研究区景观破碎度总体表现为先增高后降低的趋势,伴随着人类活动的增强,人工水域所占面积比例在逐渐提升,水域斑块的边界形态在不断趋于规则化和简单化.
Based on Landsat TM/OLI images from 1986 to 2015,the wetland information was extracted of the middle reaches of the Heihe River via the modified normalized difference water index,with the support of remote sensing and geographic information system technology as well as the threshold segmentation method,and the temporal and spatial changes were analyzed from three aspects:the area,spatial distribution and shape changes.The results showed that the water wetlands in the mid-stream of the Heihe River have been shrinking significantly in the past 30 years.Before 2000,the shrinkage was more severe,and then it tended to be flat;the northwestern part of the study area was affected by human activities and the size of the upstream waters,which was prone to repeated changes,while the central and southwestern parts of the country experienced excessive reclamation due to agricultural activities.The watershed had continued to shrink;the fragmentation of the landscape in the study area had generally shown a trend of increasing first and then decreasing,with an increase in human activities,and the area proportion of artificial waters was increasing too.Gradually,the boundary pattern of water patches had also become increasingly regular and simplistic.
作者
鲁晖
杜婷
颉耀文
董敬儒
Lu Hui;Du Ting;Xie Yao-wen;Dong Jing-ru(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第4期506-512,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(41471163,41530752)
科技基础资源调查专项(2017FY101003)
中央高校基本科研业务费专项资金项目(lzujbky-2017-it105)
关键词
水域湿地
时空变化
景观
黑河干流中游
wetland
spatial and temporal changes
landscape
the mid-stream of the Heihe River
