长江流域kNDVI的时空演变特征分析  

Characterization of the Spatial and Temporal Evolution of Vegetation kNDVI in Yangtze River Basin

作　　者：彭德静 刘娜 湛紫微 Peng Dejing;Liu Na;Zhan Ziwei(School of Geography and Tourism,Hengyang Normal University,Hengyang 421002,Hunan,China)

机构地区：[1]衡阳师范学院地理与旅游学院,湖南衡阳421002

出　　处：《绿色科技》2025年第5期212-216,共5页Journal of Green Science and Technology

摘　　要：长江流域跨度大,地形气候复杂,生态环境脆弱,研究长江流域植被动态变化对于长江流域植被资源管理、生态建设和保护具有重要意义。通过核归一化植被指数kNDVI,研究2000-2022年长江流域植被时空演变趋势,揭示长江流域植被kNDVI的时空演变特征。结果表明:(1)长江流域kNDVI的均值空间分布整体上呈现出东高西低的趋势。除了长江流域西部,长江的上游源头河段,kNDVI在绝大部分区域都高于0.4。(2)长江流域在2000-2022年,kNDVI整体上呈现缓慢波动上升趋势。夏季kNDVI较高;冬季kNDVI较低,但也呈现上升趋势。(3)长江流域的kNDVI从空间上看大部分地区呈现出上升趋势。kNDVI在冬春季节呈现上升趋势的面积最多,夏秋季节相反。还发现长江流域北部秦岭附近地区的kNDVI在秋季呈现下降趋势。The Yangtze River Basin spans a large area with complex topography and climate and fragile ecological environment,and the study of the dynamic change of vegetation in the Yangtze River Basin is of profound significance for the management of vegetation resources,ecological construction and protection in the Yangtze River Basin.In this study,the spatial and temporal evolution trend of vegetation in the Yangtze River Basin from 2000 to 2022 is investigated by using the kernel normalized vegetation index kNDVI to reveal the spatial and temporal evolution characteristics of vegetation kNDVI in the Yangtze River Basin.The results show that:①the spatial distribution of the mean value of vegetation kNDVI in the Yangtze River Basin shows an overall trend of high in the east and low in the west.Except for the western part of the Yangtze River Basin,the vegetation kNDVI values of the upper headwater reaches of the Yangtze River were higher than 0.4 in most regions;②during the period of 2000-2022,the vegetation kNDVI of the Yangtze River Basin as a whole showed a slowly fluctuating upward trend.The vegetation kNDVI value is higher in summer;the vegetation kNDVI value is lower in winter;but it also shows an increasing trend;③vegetation kNDVI in the Yangtze River Basin showed an increasing trend in most areas from a spatial point of view.Vegetation kNDVI showed the most area with an increasing trend in the winter and spring seasons,and the opposite in the summer and fall seasons.This study also found that vegetation kNDVI in the northern part of the Yangtze River Basin near the Qinling Mountains showed a decreasing trend in the fall.

关 键 词：植被变化 kNDVI 长江流域 趋势 

分 类 号：Q948[生物学—植物学]