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,2015,33(3):245~253
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
  
DOI:10.7606/j.issn.1000-7601.2015.03.39
中文关键词:  实际蒸散发量  时空变化  MOD16  土地利用类型  关中地区
英文关键词:ET  sptio-temporal change  MOD16  land using type  Guanzhong Region
基金项目:国家自然科学基金(41171310)
作者单位
喻元 陕西师范大学旅游与环境学院 陕西 西安 710119 
白建军 陕西师范大学旅游与环境学院 陕西 西安 710119 
王建博 陕西师范大学旅游与环境学院 陕西 西安 710119 
位贺杰 陕西师范大学旅游与环境学院 陕西 西安 710119 
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中文摘要:
      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。
英文摘要:
      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 distribution was showed the three step pattern as approximately decreasing from southwest to northeast. The ET spatial distribution 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 summer 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.
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