祁连山国家公园植被覆盖变化地形分异效应
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

S157.1;TP79

基金项目:

甘肃省林业公益性行业研究专项“祁连山国家公园体制试点”(201904019)。


Effects of Terrain Factors on Vegetation Cover Change in National Park of Qilian Mountains
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    [目的] 分析祁连山国家公园不同时间植被覆盖变化情况以及不同高程、坡度、坡向等地形条件下植被覆盖变化的空间分异性,为祁连山生态环境修复和保护提供参考依据和数据支撑。[方法] 利用祁连山2006,2014,2019年3期遥感影像,采用像元二分模型估算植被覆盖度,结合趋势分析法和地形面积修正法,对不同地形条件下植被覆盖空间分异性及变化特征进行分析。[结果] ①祁连山植被覆盖度空间分布格局为西北部低,东南部高,总体以较低植被覆盖度为主。2006—2019年,祁连山植被覆盖度整体呈增加趋势,增加面积约占46.7%,减少面积约占33.3%,植被恢复状况较好,其中,低和较低植被覆盖度面积减小,其他等级植被覆盖度面积均有不同程度的增加。②祁连山植被覆盖变化在不同高程范围内存在明显差异:3 200 m以下中低海拔区域呈增加趋势,2 200 m以下低海拔区域增加特别明显;3 700 m以上中高海拔区域则呈减少趋势,且海拔越高减少趋势越明显。③随着坡度的增加,祁连山植被覆盖变化趋势由增加转为稳定再转为减少。坡度15°以下区域呈增加趋势;坡度25°以上区域呈减少趋势;坡度40°以上区域减少趋势尤其明显;坡度15°~25°范围内分布相对稳定。④从坡向来看,除平地外,祁连山植被覆盖变化类型在其他坡向上的差异较小。[结论] 祁连山植被覆盖变化在高程、坡度等地形条件下差异明显,坡向的地形效应不明显。

    Abstract:

    [Objective] The change in vegetation cover at different time and the spatial variability of vegetation cover change due to different terrain factors such as elevation, slope, and aspect were analyzed in order to provide reference and data support for the restoration and protection of the ecological environment of the national park of Qilian Mountains. [Methods] Based on remote sensing images of the Qilian Mountains in 2006, 2014, and 2019, the pixel dichotomy model was used to estimate vegetation cover, combined with the trend analysis method and the terrain area correction method in order to analyze the spatial distribution and variation characteristics of vegetation cover under different terrain conditions. [Results] ① Vegetation cover was low in the northwest and high in the southeast of Qilian Mountains. Most of the regions were covered with lower vegetation cover. Vegetation cover showed an increasing trend from 2006 to 2019. The increasing areas accounted for about 46.7% of the total area, and the decreasing areas accounted for about 33.3% of the total area. Vegetation recovery was good during this period. The area of low and lower vegetation cover decreased, while the areas of other cover levels increased to varying degrees. ② There were significant differences in vegetation cover at different elevation ranges: The low-middle elevation areas below 3 200 meters showed an increasing trend, and the low elevation areas below 2 200 meters increased significantly, while the middle-high elevation areas above 3 700 meters showed a decreasing trend. The decreasing trend was more obvious at higher altitudes. ③ As slope increased, the trend in vegetation cover change shifted from increasing to stable, and then turned to decreasing in the steep slopes. The vegetation cover change showed an increasing trend in the areas below 15° and a decreasing trend in the areas above 25°, and the decreasing trend was particularly obvious above 40°. For areas with slopes ranging between 15° and 25°, the distribution of types of vegetation cover change was relatively stable. ④ For the different slope aspects, there were no obvious distribution differences for different vegetation cover change types except in the flat land area. [Conclusion] The effects of elevation and slope factors on vegetation cover change were obvious. However, the effect of aspect factor was not obvious.

    参考文献
    相似文献
    引证文献
引用本文

李娟,龚纯伟.祁连山国家公园植被覆盖变化地形分异效应[J].水土保持通报,2021,41(3):228-237

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-01-11
  • 最后修改日期:2021-03-31
  • 录用日期:
  • 在线发布日期: 2021-07-08
  • 出版日期: