基于Landsat遥感影像资料的新疆阿尔泰山圆叶桦的空间变化特征

Spatial Variation Characteristics of Betula Rotundifolia in Xinjiang Altai Mountains

利用1990、2000、2013年6-9月阿尔泰山地区Landsat遥感影像资料,综合运用遥感技术及相关分析方法,研究近24 a阿尔泰山圆叶桦的空间分布及其动态变化。结果表明:(1)阿尔泰山圆叶桦主要分布在86.5°E-89.5°E、47.6°N-49.2°N,近24 a来阿尔泰山圆叶桦的分布面积整体呈增长趋势且幅度较大,增长速率较快;(2)圆叶桦主要分布在海拔2000~2400 m之间,其分布高度随时间整体呈上升态势,上升速率为0.87 m·(10 a)^-1;(3)圆叶桦主要分布在阴坡,占比达58%,近24 a来随着海拔上升在阳坡的分布逐渐增加、阴坡相反。

Based on the Landsat remote sensing image data in the Altai Mountains from June to September in 1990, 2000 and 2013, the spatial distribution and dynamic changes of betula rotundifolia in recent 24 years were studied by using remote sensing technology and correlation analysis method. The results are as follows:(1) Betula rotundifolia in Altai Mountains mainly distributed in the range of 86.5°E-89.5°E, 47.6°N-49.2°N. Overall, the distribution area of betula rotundifolia in Altai Mountains increased in recent 24 years and its increasing rate was faster.(2) Betula rotundifolia mainly distributed from 2000 to 2400 m altitute, and its distribution height increased overall with the rate of 0.87 m·(10 a)^-1;(3) Betula rotundifolia mainly distributed on shady slope and accounted for 58% of the total area. In the past 24 years, the distribution of betula rotundifolia on sunny slope increased gradually with the elevation rising, while that on shady slope was contrary.