基于Landsat影像的黄河砒砂岩区植被地形耦合效应OA
Vegetation topographic coupling effect in the Yellow River arsenic sandstone area based on Landsat images
黄河砒砂岩区生态环境脆弱、土壤侵蚀剧烈,研究该区域植被覆盖动态与地形因子的耦合机制,对促进生态恢复具有重要理论价值.基于2000-2024年Landsat遥感数据,采用线性回归方法分析植被覆盖时空变化趋势;结合数字高程模型,系统探讨植被覆盖度与高程、坡度、坡向及地形位指数等地形因子的关联特征;并运用地理探测器,揭示地形因子对植被覆盖空间分异的驱动作用.结果表明:(1)近25a来研究区植被覆盖度整体呈上升趋势,均值介于0.34～0.52之间;(2)覆土、覆沙区以高植被覆盖为主,裸露砒砂岩区则多为低植被覆盖;(3)植被覆盖随海拔与坡度升高呈"先升后降"的趋势,分别在1200～1300 m和5°～15°区间达到峰值;坡向间差异不显著;植被主要分布于地形位指数为0.38～0.7的中地形位等级;(4)各因子对植被覆盖的影响程度依次为:高程>坡度>地形位指数>坡向,任意两因子交互作用均表现为非线性增强,其中高程与地形位指数的交互解释力最强(q值为0.22).黄河砒砂岩区的植被覆盖持续改善,与地形因子耦合关系显著,研究结果可为黄河砒砂岩区的植被精准配置与黄河流域高质量发展提供科学支撑.
Research on the dynamic changes in vegetation coverage and itscoupling effect with terrain factors can provide theoretical support for vegetation restoration in the Yellow River arsenic sandstone area,a fragile ecologi-cal environment affected by severe erosion.We examined the vegetation coverage characteristics and trends in the Yellow River arsenic sandstone area over the past 25 years using Landsat series data and linear regression analysis.Terrain data were used to explore the coupling law of vegetation coverage for terrain factors such as ele-vation,slope,slope direction,and topographic index,and combined with geographic detectors to reveal the driv-ing mechanism of terrain factors on vegetation coverage.(1)From 2000 to 2024,the average vegetation coverage in the Yellow River arsenic sandstone area was between 0.34 and 0.52,showing an overall upward trend;(2)Veg-etation coverage was generally high in the soil-covered and sand-covered areas and low in exposed arsenic sand-stone areas;(3)With increasing altitude and slope,vegetation coverage in the arsenic sandstone areas showed a trend of initial increase followed by a decrease,reaching the maximum at 1200-1300 m and 5°-15°,respectively,and showing strong fluctuation;in terms of topographical position,vegetation was mainly distributed at the medi-um topographical position between 0.38 and 0.7;(4)The factors driving vegetation coverage were ranked in the following descending order based on their degree of influence:elevation>slope>topographic index>slope direc-tion.The relationship between any two factors was nonlinear enhanced,with the largest q value(0.22)being ob-served for elevation vs.topographic index.The overall vegetation coverage in the Yellow River arsenic sandstone area is currently increasing,and the coupling effect with topographic factors is obvious.The results of this study provide scientific support for precise vegetation allocation in the Yellow River arsenic sandstone area,contribut-ing to the high-quality development of the Yellow River Basin.
张璐;彭彬;徐佳怡;韩珈琦;杨文杰;王咏
华北水利水电大学测绘与地理信息学院,河南 郑州 450046华北水利水电大学测绘与地理信息学院,河南 郑州 450046华北水利水电大学测绘与地理信息学院,河南 郑州 450046华北水利水电大学测绘与地理信息学院,河南 郑州 450046华北水利水电大学测绘与地理信息学院,河南 郑州 450046华北水利水电大学测绘与地理信息学院,河南 郑州 450046
砒砂岩植被覆盖度时空分异地形效应地理探测器
arsenic sandstonevegetation coveragespatial-temporal differenceterrain effectgeodetic detector
《干旱区研究》 2026 (2)
313-324,12
国家自然科学基金项目(32101591)河南省科技攻关项目(232102321108)
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