古浪县生态环境遥感监测与变化分析研究

Remote Sensing Monitoring and Change Analysis of Ecological Environment in Gulang County

生态环境质量关乎人类生存及各行业的发展。为准确、客观了解古浪县生态环境变化情况,本文选取2005与2016年两期Landsat遥感影像数据,利用遥感生态指数(RSEI)对古浪县2005—2016年的生态环境状况作出评价与变化分析,结果表明:(1)2005—2016年古浪县生态环境质量呈上升趋势,全县RSEI均值由2005年的0.421上升到2016年的0.439,整体上升4.3%;(2)通过空间格局分析,生态环境变好的区域主要集中在腾格里沙漠南缘及新堡乡等地区;生态环境变差的区域主要集中在古浪县的泗水镇、土门镇、大靖镇等地区;(3)利用逐步回归分析方法进行建模与预测,发现负面影响因子LST及NDSI的系数呈上升趋势,其中热度(LST)因子系数最高,是影响古浪县生态环境的重要指标。

The Eco-environment quality is related to the survival of human beings and the development of businesses.In order to accurately and objectively know the Eco-enviroment changing in Gulang county.This paper has made a monitoring and change analysis of eco-enviroment in Gulang from 2005 to 2016 by using remote sensing ecological index(RSEI)and selecting the Landsat remote sensing image in 2005 and 2016.The results showed that:(1)The ecoenviroment of Gulang county tends to increase and the average of RSEI around the county rose from 0.421 in 2005 to0.439 in 2016,4.3%was rose in total;(2)By the spatial pattern analysis,the eco-enviroment which has obviously improved concentrate on the South mountain in Gulang county,the southern edge of Tengger Desert.Sishui,Tu men and Dajing,towns in Gulang Couty,where the eco-enviroment has been worse;(3)Using stepwise regression analysis method,we found that the coefficient of LST and NDSI showed an upward trend,and the LST coefficient was the most important factor affecting the ecological environment in Gulang.