干旱地区农业研究Issue(3)：245-253,9.DOI:10.7606/j.issn.1000-7601.2015.03.39
基于 MOD16的关中地区实际蒸散发时空特征分析
Analysis on sptio-temporal characteristics of ET based on MOD16 in Guanzhong Region
摘要
Abstract
Based on the new MOD16 remote sensing data sets and the precision validation ,statistically analyzed the sptio-temporal evolving characteristics and the difference of evapotranspiration (ET ) by various land using types in Guanzhong region during 2000—2012 with support of GIS and RS technology .The results showed that :(1 ) MOD16-ET data has a good precision in Guanzhong region ,the validated relative error and correlation coefficient were 10 .38%and 0 .69 ,respectively ;(2 ) The average multi-years ET in Guanzhong Region was 520 .05 mm·a-1 ,the spatial distri-bution was showed the three step pattern as approximately decreasing from southwest to northeast .The ET spatial distribu-tion in four seasons was the basic consistent with the multi-year average situation .(3) The ET spatial distribution had a significant effect by the land cover types ,the sequence of ET intensity for each land cover type is forest (623 .67 mm· a-1 ) > grassland (504 .51 mm · a-1 ) > garden (460 .86 mm · a-1 )> farmland (448 .89 mm · a-1 ) > bare land (408 .77 mm·a-1 );(4) The annual variation trend of ET in Guanzhong Region was increased at 0 .87 mm·a-1 ,the spatial distribution was showed a tendency of decreasing in east and increasing in west ,among them ,in spring and sum-mer seasons had a rather greater proportion for changing areas ,while in autumn and winter seasons ,most of Guanzhong Region has no obvious ET variation .The monthly ET roughly showed a change trend of increasing first then decreasing , also the annual ET was mainly concentrated in summer season .关键词
实际蒸散发量/时空变化/MOD16/土地利用类型/关中地区Key words
ET/sptio-temporal change/MOD16/land using type/Guanzhong Region分类
农业科技引用本文复制引用
喻元,白建军,王建博,位贺杰..基于 MOD16的关中地区实际蒸散发时空特征分析[J].干旱地区农业研究,2015,(3):245-253,9.基金项目
国家自然科学基金 （）
