摘要
西南干旱河谷地区植被退化严重,而地形是影响植被空间分布、调节生态系统的重要因素,分析喜德县植被盖度与地形因子的空间耦合及异质性对于区域生态修复、植被保护具有重要意义。本文基于Landsat 8多光谱遥感影像数据,结合DEM等地理信息数据,运用地学统计、地理加权回归等方法,对凉山州喜德县植被盖度与地形因子的空间耦合关系进行分析。结果表明:(1)研究区地形整体上呈现出“西北和东南高,东北和西南低”的特征,植被在空间上呈集聚分布模式,孙水河干暖河谷地带植被盖度偏低;(2)在全局上,植被盖度对宏观地形因子的响应较为一致,随着地形起伏度、地表切割深度、地表粗糙度的增大,植被盖度均呈现上升趋势,但对海拔、坡度、坡向、坡向变率等微观地形因子的响应差异较大;(3)在局部上,植被盖度对各地形因子的响应存在显著的空间异质性,主要表现为研究区西北、南部区域植被盖度与海拔、地表粗糙度呈显著的负相关,西部县界凹侧植被盖度与地形起伏度呈显著的正相关。研究结果可为当地政府在不同地形环境下实施生态治理提供科学支撑。
As vegetation degradation is severe in the dry valley area of Southwest China,and the terrain is an essential factor affecting the spatial distribution of vegetation and regulating the ecosystem,it is of great significance for regional ecological restoration and vegetation protection to analyze the spatial coupling and heterogeneity of vegetation coverage with terrain factors in Xide County.Based on Landsat8 multi-spectral remote sensing image data,DEM,and other geographic information data,the spatial coupling relationship between vegetation coverage and terrain factors in Xide County of Liangshan Prefecture is analyzed by geostatistics,geographically weighted regression,and other methods.The results indicate that:(1)As a whole,the spatial distribution of topography presents the characteristics of“high in northwest and southeast but low in northeast and southwest”;vegetation is in a spatial agglomeration distribution pattern;the vegetation coverage in the dry and warm valleys of the Sunshui River is relatively low;(2)On the whole,the vegetation coverage has a fairly consistent response to the macro-terrain factors;the vegetation coverage shows an increasing trend as the topographic relief,surface cutting,and surface roughness increases but different responses to altitude,slope,aspect,aspect and other micro-terrain factors;(3)Locally,there is significant spatial heterogeneity in the response of vegetation coverage to geomorphological factors;to be specific,vegetation coverage with altitude and surface roughness in the northwest and southern regions of the study area shows a negative correlation,while vegetation coverage with topographic relief on the concave side of west boundary of the county presents a significantly positive correlation.The research results will provide scientific support for local governments to implement ecological governance in different terrain environments.
作者
李晓静
张斌
刘守江
覃发超
唐毅
LI Xiao-jing;ZHANG Bin;LIU Shou-jiang;QIN Fa-chao;TANG Yi(School of Geographical SciencesChina West Normal University,Nanchong Sichuan 637009,China;Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion on Dry Valleys,China West Normal University,Nanchong Sichuan 637009,China;No.405 Geological Exploration Team,Sichuan Bureau of Geology&Mineral Resources,Chengdu Sichuan 611830,China)
出处
《西华师范大学学报（自然科学版）》
2022年第2期129-136,共8页
Journal of China West Normal University(Natural Sciences)
基金
国家自然科学基金项目(41971015)。
关键词
植被盖度
地形因子
空间异质性
地理加权回归
干旱河谷
vegetation coverage
terrain factors
spatial heterogeneity
geographically weighted regression
dry valley
