摘要
地表覆盖变化是生态环境变化的缩影,研究地表覆盖变化可为生态环境恢复和国土资源合理利用提供参考。基于Globeland30数据,以威宁为案例,探究乌蒙山区2000—2020年地表覆盖变化及地形分异特征。结论如下:(1)期间地表覆盖变化显著,总体以林地、草地、水体、人造地表扩张,耕地收缩,水体保持稳定为主要特征。(2)随海拔上升,耕地、林地、草地和人造地表面积呈先增后减少变化,水体面积在2000~2200 m分布较多;各类地表覆盖主要在海拔1600~2600 m进行转换。(3)随坡度增加,各地表覆盖面积与坡度存在明显的关系,即陡坡区的地表覆盖面积比平坡区的占比大,且土地转移较多发生在耕地、林地和草地间,在坡度10°至30°时植被地表覆盖转移面积较多。(4)随起伏度上升,耕地、林地、草地和人造地表随起伏度增加面积呈先增加后减少变化,水体随起伏度增加而不断减少;耕地、林地和草地之间转换,大部分都在起伏度<50 m地区进行;其中耕地转移面积最多,水体转移面积较少。
Land cover change can reflect ecological environment change,and the study on land cover change can provide reference for ecological environment restoration and rational use of national land resources.Based on the Globeland30 data,Weining is taken as the case to study the land cover changes and topographic differentiation characteristics of the Wumeng Mountains from 2000 to 2020.The conclusions are as follows:(1)The land cover changes during the period are remarkable,characterized by the expansion of woodland,grassland,water bodies and artificial land surface,and the contraction of arable land.(2)As the altitude rises,the area of arable land,woodland,grassland and artificial land surface first increases and then decreases,while the area of water bodies is mainly distributed in the range of 2000 m to 2200 m.The land cover type transfer mainly occursin the range of 1600 m to 2600 m.(3)With the increase of slope,there is an obvious relationship between land cover area and slope,that is,the land cover area of steep slope takes up a larger proportion than that of flat slope;the land cover type transfer mainly occurs among arable land,woodland and grassland,and the transfer mainly occurs at the slope of 10°to 30°.(4)With the rise of undulation,the area of arable land,woodland,grassland and artificial land surface increases and then decreases,while water bodies keep decreasing;the land cover type transfer mainly occurs among arable land,woodland and grassland,and most of them occurs in the area of undulation<50 m;the area transferred from arable land is the largest,and the area transferred from water bodies is the smallest.
作者
令狐雪雪
滕明塔
王佳佳
LINGHU Xuexue;TENG Mingta;WANG Jiajia(School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China)
出处
《贵州科学》
2023年第2期74-81,共8页
Guizhou Science
关键词
地表覆盖
地形
时空变化
转移特征
威宁
land cover
topography
space-time variation
transfer characteristics
Weining
作者简介
令狐雪雪(1997-),女,汉族,贵州遵义人,硕士研究生,研究方向为旅游资源开发与规划。
