摘要
以宁夏南部山区为研究区,基于Landsat影像,运用改进的像元二分模型估算1996、2008和2018年3个时相的植被覆盖度,用数字高程模型提取坡度、坡向等地形因子,分析研究区植被覆盖度的变化以及与地形因子的相关性。结果表明:研究期间,研究区植被覆盖度呈现显著增加,尤以高植被覆盖度为甚。总体来看,高程在2400 m以下的植被覆盖度随高程增加呈现上升趋势;随坡度增加,植被覆盖度呈现上升趋势;1996和2018年2个年份的植被覆盖度在各坡向差异不大,但是2008年植被覆盖度有较明显的差异,变化趋势为阴坡>半阴坡>半阳坡>阳坡。
In this paper,the southern mountainous area of Ningxia was taken as the research area.Based on Landsat images,the improved pixel dichotomy model was used to estimate the vegetation coverage in 1996,2008 and 2018.The topographic factors such as slope and aspect were extracted by digital elevation model.The change of vegetation coverage and its correlation with topographic factors in the study area were analyzed.The results showed that during the study period,the vegetation coverage in the study area increased significantly,especially the high vegetation coverage.In general,vegetation coverage below 2400 m showed an upward trend with the increase of elevation.With the increase of slope,vegetation coverage showed an upward trend.There was no significant difference in vegetation coverage between 1996 and 2018 in different aspect,but there was a significant difference in 2008,with the trend of shady slope>semi-shady slope>semi-sunny slope>sunny slope.
作者
白思雨
张佳瑜
BAI Siyu;ZHANG Jiayu(College of Urban and Environmental Sciences,Northwest University,Xi′an 710127,China;School of Geography and Planning,Ningxia University,Yinchuan 750021,China)
出处
《测绘与空间地理信息》
2024年第1期46-49,共4页
Geomatics & Spatial Information Technology
基金
宁夏自然科学基金项目(2021AAC03087、2020AAC03053)
宁夏高等学校科研项目(NGY2020012)资助。
关键词
宁夏南部山区
植被覆盖度
高程
坡度
坡向
相关性
mountain area of southern Ningxia
vegetation coverage
elevation
slope
aspect
correlation
作者简介
白思雨(2001-),女,宁夏银川人,地图学与地理信息系统专业硕士研究生,主要研究方向为冰冻圈遥感。
