水土保持研究2018，Vol.25Issue(3)：224-231,8.
基于MODISNDVI数据的陕甘宁地区植被覆盖时空变化及其对极端气候的响应
Spatiotemporal Changes of Vegetation in the Shaanxi-Gansu-Ningxia Region and Response to Climatic Extremes Based on MODIS NDVI Data
摘要
Abstract
Droughts,precipitation and other extreme climatic events often impact on vegetation.Base on daily precipitation,temperature (average,maximum,and minimum) data from 14 meteorological stations and a satellite-derived normalized difference vegetation index (NDVI) from MODIS dataset,we investigated relationship between vegetation change and climatic extremes in Shaanxi-Gansu-Ningxia region during 2000-2014.The results showed that the vegetation coverage of the study region exhibited the significant increase,with a linear tendency being 0.066/decade (p＜0.01) during 2000 2014.Annual NDVI during 2000-2014 for grassland,shrub-land,cultivated vegetation,needle leaved forest and broad-leaf forest exhibited the significant increase in a linear trend of 0.06/decade,0.058/decade,0.077/decade,0.039/decade and 0.036/decade (p＜0.01),respectively.As for spatial distribution,NDVI showed thedecreasing trend from southeast to northwest,the areas in Yulin and Yan'an exhibited the significant increase because of the ecological engineering construction.All of the climatic extremes had no significantly change trend except the TXx.On the monthly scale,vegetation coverage and different vegetation types significantly positively responded to precipitation extremes and temperature extremes (TMAXmean,TMINmean,TNx,TNn,TXn and TXx) (p＜0.01).All of the precipitation extremes and temperature extremes indicted significant positive relationship with NDVI in the spring and autumn (p＜0.01).However,only the relationship between precipitation extremes (RX1day and RX5day) and NDVI was significant in summer.The vegetation showed the significant negative relation to RX5day in winter (p＜0.05).Time lags analysis demonstrated that NDVI responded to precipitation extremes (RX1day and RX5day) and temperature extremes (TMAXmean and TXx) a lag of 1 month.关键词
NDVI/时空变化/极端气候指数/相关分析/陕甘宁地区Key words
NDVI/spatiotemporal variation/climate extremes/correlation analysis/Shaanxi-Gansu-Ningxia region分类
农业科技引用本文复制引用
赵安周,张安兵,赵延旭,范倩倩,赵玉玲..基于MODISNDVI数据的陕甘宁地区植被覆盖时空变化及其对极端气候的响应[J].水土保持研究,2018,25(3):224-231,8.基金项目
河北省自然科学基金(D2017402159) （D2017402159）
邯郸市科学技术研究与发展计划项目(1724230057-1/1723209055-2) （1724230057-1/1723209055-2）
河北省社会科学发展研究课题(201703060201) （201703060201）
