【摘要】 为掌握宁夏归一化植被指数(normalized difference vegetation index,NDVI)与气候生产力的时空变化特征及其关系,本文基于2000—2017年遥感影像数据,采用一元线性回归分析、Thornthwaite Memorial模型及相关分析等方法进行分析。结果表明:宁夏南部林区和引黄灌区植被指数高于中部干旱带且NDVI以0.041 (10 a)-1的速率呈显著增加趋势;18 a间宁夏植被指数轻度增加区域占64.12%;宁夏气候生产力在空间上呈东南向西北逐渐递减变化,年降水量与气候生产力的时间变化趋势基本一致;大部分地区NDVI与气候生产力在空间上呈正相关,呈负相关区域占4.92%;两者的线性拟合度达0.731。更多还原

【Abstract】 This paper examines the spatiotemporal variation characteristics and relationship of normalized difference vegetation index(NDVI) of Ningxia versus its climate productivity based on remote sensing images of 2000-2017, using methods of univariate linear regression analysis, a Thornthwaite memorial model, correlation analysis, etc. The results show that the NDVI of the southern Ningxia forest area and the irrigation districts with irrigation water diverted from the Yellow River is higher than that of the central arid zone, and in recent years it is increasing significantly at a rate of 0.041(10 a)-1. During the 18 years, vegetation index in Ningxia increased slightly, accounting for 64.12%. The climatic productivity is decreasing gradually across Ningxia from southeast to northwest, and the time trend in annual precipitation is similar to that in climatic productivity. In most areas, NDVI is positively correlated with climatic productivity in pixel scale, with negative correlation covering only 4.92% of the total area. Linear fitting degree of these two parameters is 0.731.更多还原