【摘要】 为探明喀斯特地区地表反照率的时空分布及变化趋势,利用2001—2015年中分辨率成像光谱仪(MODIS)的地表反照率数据(MCD43B3)和增强植被指数(EVI)数据(MOD13A3)分析贵州喀斯特地表反照率时空分布特征及变化、地表反照率与植被指数的关系及其变化和农田地表反照率的变化趋势。结果表明:贵州大部分地区15年平均地表反照率为0.10~0.15,高值区主要分布在贵州中部、西部边缘和西南部;各市州的15年区域平均为0.12~0.13,无显著差异,与各市州喀斯特分布面积大小关系不大。地表反照率的季节平均差异较大,其中夏季最大,全省大部分区域为0.13~0.16;冬季最小,全省大部分区域在0.12以下;各市州15年季节平均在冬季的标准差最大,均大于0.01,表明地表反照率在冬季最复杂;各市州月平均地表反照率1—7月逐渐增大,7—12月逐渐减小。贵州地表反照率与植被指数呈正相关性,其植被指数呈上升趋势,上升最明显阶段为2006—2008年;地表反照率呈波动上升趋势,但不显著。农田地表反照率2001—2013年每年的年均值在0.126~0.137,上升趋势较小。更多还原

【Abstract】 The temporal and spatial distribution characteristics and variation,correlation between surface albedo and enhanced vegetation index(EVI),and variation trend of farmland surface albedo of karst area,Guizhou were analyzed by using the surface albedo data(MCD43 B3)and EVI data from MODIS to explore temporal and spatial distribution and variation trend of surface albedo in karst area,Guizhou.Results:The average surface albedo of most regions in Guizhou is 0.10～0.15 during 2001—2015 and the areas with a higher value distribute in Central,Western edge and Southwestern Guizhou.The average surface albedo of different regions is 0.12～0.13 during 2001—2015 and the average surface albedo value is not related to karst distribution area scale.There is an obvious difference in average surface albedo among four seasons.The surface albedo is the maximum in Summer and the surface albedo of most regions is 0.13～0.16 in Summer.The surface albedo is the minimum in Winter and the surface albedo of most regions is below 0.12 in Winter.The standard deviation of average seasonal surface albedo of different regions is the maximum(>0.01)in Winter,which indicates the surface albedo is most complex.The average monthly surface albedo of different regions gradually increases from January to July and decreases from July to December.The surface albedo is positively related to EVI.The EVI shows a rising trend and the significant rising period of EVI is during 2006—2008.The surface albedo presents a wavelike rising trend.The average annual value of farmland surface albedo is 0.126～0.137 during 2001—2013 but the rising trend is less.更多还原