鄱阳湖流域NDVI时空变化及其与地表径流的关系  

Spatio-temporal Changes of NDVI and Their Relationships with Runoff in the Poyang Lake Basin

作　　者：邵步粉[1] 周锁铨[1] 顾婷婷[1] 李强[1] 

机构地区：[1]南京信息工程大学/气象灾害省部共建教育部重点实验室,南京210044

出　　处：《中国农业气象》2010年第2期288-294,共7页Chinese Journal of Agrometeorology

基　　金：国家自然基金(40775061/D0507);中科院遥感所(SK050004);江苏省气象灾害重点试验室(KLME050212)

摘　　要：根据鄱阳湖流域4个子流域1982-1999年归一化植被指数(NDVI)数据集和4个水文站的径流数据,采用年代际差异变化、相关分析、Morlet小波分析方法,对鄱阳湖4个子流域NDVI和径流关系进行研究,并从年内、年际两个角度研究各子流域的NDVI时空变化特征。结果表明:分析期内鄱阳湖流域各子流域多年平均NDVI的年内变化趋势一致,年平均NDVI总体上都呈增加趋势,NDVI主要受到降水、径流的影响。相关分析显示,整个流域年NDVI与径流量间呈显著正相关,径流量与滞后3个月的植被NDVI间相关性最高;子流域的径流量普遍存在着12个月、部分存在35、62个月左右周期的震荡信号,各信号频率分布的时间域及其强度存在着差异,其中12个月周期最强,短周期强于长周期;NDVI与径流量具有同等的周期变化特点。Based on the 8km resolution multi-temporal NOAA AVHRR-NDVI datasets and the daily runoff data from four hydrometrical stations during 1982-1999,the characteristics of NDVI and runoff and their relationships in four sub-regions of Poyang Lake Basin were studied at annual and inter-annual scales by using the methods of inter-decadal variations,correlation analysis and Morlet wavelet analysis. The results indicated that the mean annual NDVI increased all in four sub-regions from 1982 to 1999 and the inter-annual NDVI varied with the same trend. NDVI was mainly influenced by precipitation and runoff. The correlation coefficient between NDVI and runoff were positive and significant statistically in the whole region,and NDVI maximally respond to the variation of runoff with a lag of about 3 months. The runoff generally oscillated with a cycle of about 12 months in all sub-regions,and in several sub-regions,it oscillated with the cycle of about 35 and 62 months. The frequency distribution of each oscillation signal was different,not only in time domain but also in intensity,of which the cycle of 12 months was the strongest of all and the short cycle was stronger than the long cycle. The NDVI had the same characteristics of cycle oscillation as that of runoff.

关 键 词：鄱阳湖流域 径流 NDVI 相关分析 MORLET小波分析 

分 类 号：S16[农业科学—农业气象学]