干旱区生态环境知识资源中心(Arid): 西北干旱区玛纳斯河流域植被时空变化特征及其与地形因子的空间关系

Arid

	西北干旱区玛纳斯河流域植被时空变化特征及其与地形因子的空间关系
其他题名	Spatial and Temporal Variation Characteristics of Vegetation in the Manas River Basin in Northwest Arid Region and Its Spatial Relationship with Topographical Factors
	覃金兰; 薛联青
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2020
卷号	29 期号:11 页码:2179-2188
中文摘要	在西北干旱区,植被覆盖对维持独特的陆地生态系统起着关键作用,植被生长对地形因子的变化较为敏感,地形对植被覆盖的影响受到越来越多的关注。本文综合运用RS和GIS技术研究玛纳斯河流域20002018年生长季NDVI(Normalized Difference Vegetation Index)指数的时空变化规律,通过空间叠加分析研究NDVI在高程、坡度及坡向上的变化特征,并引进分布指数p揭示3个地形因子与植被覆盖的空间分布格局,当p值>1,则表明该处为植被生长的优势地形。结果表明:近19年生长季NDVI年内变化和年际变化大致呈增长趋势,植被覆盖变化率大于0的区域占总面积的83.83%,主要分布在中游绿洲区和中上游林草混合处,植被覆盖变化速率以轻微改善(42.95%)和显著改善(40.88%)占主导。植被覆盖随着高程和坡度的增加呈先上升后下降的趋势,在高程5002 000 m达到最大值0.383,在坡度5°8°达到最大值0.303,且坡向在阴坡达到最大值0.327。针对低中高3种植被覆盖类型,在高程、坡度及坡向的3 00种地形组合当中有63个组合为优势地形。从上述结果分析得到,流域20002018年植被覆盖情况日益改善,但仍有部分区域植被覆盖在持续退化,且主要集中在阳坡,这是由于阳坡比阴坡接收更多的太阳辐射,这反而抑制了植被的光合速率,加速了地表的蒸散发,应该加强该区域的治理且利用好优势地形进行生态恢复。该研究为西北干旱区的植被生长状况提供了充分的信息,并对政府在植被覆盖地区的政策具有实际指导意义。
英文摘要	In the arid region of Northwest China, vegetation cover plays a key role in the maintenance of the unique terrestrial ecosystem. Vegetation growth is sensitive to the change of topographic factors, more and more attention has been paid to the impact of topographic factors on vegetation cover. In this paper, the integrated use of RS and GIS technology to study the Manas river basin in 2000. In the arid region of Northwest China, vegetation cover plays a key role in the maintenance of the unique terrestrial ecosystem. Vegetation growth is sensitive to the change of topographic factors, and more and more attention has been paid to the impact of topographic factors on vegetation cover. In this paper, the integrated use of RS and GIS technology to study the Manas river basin in 2000-2018 growing season NDVI (Normalized Difference Vegetation Index) index of space-time change rule, through studying spatial overlay analysis of NDVI in elevation, slope and slope upward variation characteristics, and introduced the distribution index p three terrain factors and the spatial distribution pattern of vegetation cover, when the p-value>1, the advantage of the growth of vegetation topography indicates here. The results showed that the annual and interannual changes of NDVI in the last 19 growing seasons showed an approximate growth trend, and the vegetation coverage change rate of the regions with greater than 0 accounted for 83.83% of the total area, which was mainly distributed in the middle and upper reaches of the oasis and the mixture of forest and grass. The vegetation coverage change rate was dominated by slight improvement (42.95%) and significant improvement (40.88%). With the increase of elevation and slope, vegetation cover first increased and then decreased, reaching the maximum value of 0.383 at the elevation of 500- 2 000 m, 0.303 at the slope of 5°-8°, and 0.327 at the slope direction in the shaded slope. For low, medium, and high 3 planting covered types, 63 of the 300 terrain combinations in elevation, slope, and slope direction were dominant terrain. From the above results, the increasingly improved watershed vegetation cover from 2000 to 2018, but there is still some regional vegetation coverage in the continuous degradation, and mainly concentrated in the sun, this is because the slope than the slope to receive more solar radiation, it inhibited the photosynthetic rate of vegetation, accelerate the surface evaporation, should strengthen the management of the area and make good use of advantages of terrain for ecological restoration. This study provides sufficient information for vegetation growth in arid areas of northwest China and has practical guiding significance for government policies in vegetation-covered areas.
中文关键词	玛纳斯河流域 ; 植被覆盖变化速率 ; 时空分布 ; 地形因子 ; 优势地形
英文关键词	NDVI Manas valley NDVI Vegetation cover change Spatial and temporal distribution Terrain factor Dominant terrain
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:6879845
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353738
作者单位	覃金兰, 河海大学水文水资源学院, 南京, 江苏 210098, 中国. 薛联青, 河海大学水文水资源学院, 南京, 江苏 210098, 中国.
推荐引用方式 GB/T 7714	覃金兰,薛联青. 西北干旱区玛纳斯河流域植被时空变化特征及其与地形因子的空间关系[J],2020,29(11):2179-2188.
APA	覃金兰,&薛联青.(2020).西北干旱区玛纳斯河流域植被时空变化特征及其与地形因子的空间关系.生态环境学报,29(11),2179-2188.
MLA	覃金兰,et al."西北干旱区玛纳斯河流域植被时空变化特征及其与地形因子的空间关系".生态环境学报 29.11(2020):2179-2188.