CAJ | 학술논문

基于新型MOD16遥感数据集，在产品数据精度验证的基础上，利用GIS与RS技术统计分析关中地区2000—2012年间实际蒸散发（ET ）时空演变特征及不同土地利用类型蒸散差异。结果表明：（1） MOD16－ET在关中地区数据精度良好，验证相对误差和相关系数分别为10．38％和0．69；（2）关中地区多年ET均值为520．05 mm · a－1，空间分布大致呈西南－东北递减的三级阶梯格局，四季ET空间分布与多年平均情况基本一致。（3） ET空间分布受地表覆盖类型影响显著，各地类蒸散强度排序依次为林地（623．67 mm·a－1）＞草地（504．51 mm·a－1）＞园地（460．86 mm·a－1）＞农田（448．89 mm·a－1）＞裸地（408．77 mm·a－1）；（4）关中地区ET年际变化趋势以0．87 mm·a－1的速率增加，空间分布呈东部减小西部增加的趋势，其中春、夏季变化区域面积比例较大且以增加趋势为主，秋、冬季节绝大部分地区ET年际变化不甚明显。关中地区年内各月ET大致呈先升后降的变化趋势，且蒸散量主要集中于夏季。
기우신형MOD16요감수거집，재산품수거정도험증적기출상，이용GIS여RS기술통계분석관중지구2000—2012년간실제증산발（ET ）시공연변특정급불동토지이용류형증산차이。결과표명：（1） MOD16－ET재관중지구수거정도량호，험증상대오차화상관계수분별위10．38％화0．69；（2）관중지구다년ET균치위520．05 mm · a－1，공간분포대치정서남－동북체감적삼급계제격국，사계ET공간분포여다년평균정황기본일치。（3） ET공간분포수지표복개류형영향현저，각지류증산강도배서의차위임지（623．67 mm·a－1）＞초지（504．51 mm·a－1）＞완지（460．86 mm·a－1）＞농전（448．89 mm·a－1）＞라지（408．77 mm·a－1）；（4）관중지구ET년제변화추세이0．87 mm·a－1적속솔증가，공간분포정동부감소서부증가적추세，기중춘、하계변화구역면적비례교대차이증가추세위주，추、동계절절대부분지구ET년제변화불심명현。관중지구년내각월ET대치정선승후강적변화추세，차증산량주요집중우하계。
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 .