摘要
利用1989,1999,2009年3个时期TM/ETM+遥感数据,综合应用分层分类和面向对象分类技术,对银川平原湿地资源进行提取和分类,并开展1989—2009年银川平原湿地动态变化分析.结果表明,20a银川平原湿地面积减少了一半,从1989年的656.45km^2下降到2009年的332.56km^2,特别是黄河面积大幅度减少,由342.42km^2下降到98.13km^2,但在1999—2009年,下降的速率为1.07%,小于1989—1999年的下降速率6.59%.1989年自然湿地的面积占绝对的优势,约为75%,1999年和2009年自然湿地的比例下降到60%.20a养殖基地的面积增长了1倍;后10a增加的速率为6.24%,大于前10a增加的速率2.19%.造成湿地景观格局变化的主要原因包括气候变暖,黄河来水量减少和人为活动的影响.
With the TM/ETM ＋ remote sensing data from the three periods：1989,1999,2009,and integrated application of hierarchical classification and object-oriented classification technology,this article extracts and classifies the wetland resource in Yinchuan Plain and carries out the analysis on the dynamic change of the Yinchuan Plain from 1989 to 2009.The result shows that the 20 years wetland area was cut in half in Yinchuan Plain,reduced from 656.45km^2 in 1989 to 332.56km^2 in 2009,especially the Yellow River area,which was cut even sharper,dropped from 342.42km^2 to 98.13km^2.Yet,during the years from 1999 to 2009,the rate of descend was 1.07%,which is less than 6.59% from 1989 to 1999.The area of natural wetland is about 75% in 1989,which is in absolutely advantage,the proportion of natural wetland in 1999 and 2009 declined to 60%.The area of breeding sites of 20 years doubled;The rate of increase of the later 10 years was 6.24,which is more than that of the former 10 years＇ 2.19%.The primary cause of the changing of wetland landscape pattern includes climate warming,descending of the Yellow River hydrology and human activity.
出处
《宁夏大学学报（自然科学版）》
CAS
2016年第1期99-105,共7页
Journal of Ningxia University(Natural Science Edition)
基金
欧盟第七框架计划国际人才交流基金资助项目FP7-PEOPLE-2009-IRSES(247608)
关键词
遥感监测
银川平原
湿地资源
remote sensing monitor
Yinchuan plain
wetland resources
