摘要
针对气候变化和人类活动对黄河流域植被生态系统的深刻影响,急需深入探索总结规律和影响程度的问题,该文基于气候数据、归一化植被指数数据,采用残差法、趋势分析、贡献率计算、重心模型和地理探测器等手段,分析了1981—2019年黄河流域植被NDVI的时空演变格局及其对自然-人为作用的响应机制。研究结果如下:①黄河流域植被NDVI空间分布上呈现东南高、西北低的格局。1981—2019年,黄河流域植被NDVI整体呈现波动增加的趋势;②1981—2019年,黄河流域植被NDVI重心在不同时间尺度下均向东北方向迁移,表明近40年黄河流域东北部植被NDVI增量要高于西南部;③近40年,气候变化与人类活动共同作用促进植被恢复区面积占比最大,表明气候变化和人类活动的共同作用在黄河流域植被NDVI时空演变过程中起主导作用。④近40年影响黄河流域植被时空演变的交互因子由高程∩坡向(0.888,1981年)转变为高程∩GDP(0.749,2019年),说明人类活动逐渐成为黄河流域植被时空演变的主导因子。
In response to the profound impact of climate change and human activities on the vegetation ecosystem of the Yellow River Basin,there is an urgent need to explore and summarize the laws and degree of impact.Based on climate data and normalized vegetation index data,this article adopts methods such as residual method,trend analysis,contribution rate calculation,center of gravity model,and geographic detectors,analyzed the spatiotemporal evolution pattern of vegetation normalized differenve vegitation index(NDVI)in the Yellow River Basin from 1981 to 2019 and its response mechanism to natural human interactions.The research results are as follows:(1)The spatial distribution of vegetation NDVI in the Yellow River Basin shows a pattern of high in the southeast and low in the northwest.From 1981 to 2019,the NDVI of vegetation in the Yellow River Basin showed an overall fluctuating and increasing trend.(2)From 1981 to 2019,the NDVI center of vegetation in the Yellow River Basin migrated to the northeast direction at different time scales,indicating that the NDVI increment of vegetation in the northeast of the Yellow River Basin was higher than that in the southwest in the past 40 years.(3)In the past 40 years,the joint effect of climate change and human activities has promoted the largest proportion of vegetation restoration areas,indicating that the joint effect of climate change and human activities plays a dominant role in the spatiotemporal evolution of vegetation NDVI in the Yellow River Basin.(4)The interaction factor affecting the spatiotemporal evolution of vegetation in the Yellow River Basin in the past 40 years has shifted from elevation slope to elevation GDP in 1981,indicating that human activities have gradually become the dominant factor in the spatiotemporal evolution of vegetation in the Yellow River Basin.
作者
王成龙
王秀艳
李佳霖
郭兵
WANG Chenglong;WANG Xiuyan;LI Jialin;GUO Bing(Beijing Geo-Vision Technology,Co.,Ltd.,Beijing 100070,China;Chinese Academy of Surveying and Mapping,Beijing 100036,China;Shandong Xingyi Space-time Information Technology Co.,Ltd.,Yantai,Shandong 264003,China;School of Civil Engineering and Geomatics,Shandong University of Technology,Zibo,Shandong 255000,China)
出处
《测绘科学》
CSCD
北大核心
2023年第10期136-146,共11页
Science of Surveying and Mapping
基金
国家自然科学基金项目(42101306,62006096)
山东省自然科学基金项目(ZR2021MD047)
山东省高等学校“青创团队计划”团队项目(2022KJ224)
福建省自然科学基金项目(2020J05146)。
关键词
时空演变
植被NDVI
重心模型
地理探测器
黄河流域
spatial-temporal evolution
vegetation NDVI
center of gravity model
geographical detectors
Yellow River Basin