地理研究

地理研究 ›› 2013, Vol. 32 ›› Issue (4): 617-627.doi: 10.11821/yj2013040004

• 气候与地表过程 • 上一篇    下一篇

基于MOD16产品的鄱阳湖流域地表蒸散量时空分布特征

吴桂平, 刘元波, 赵晓松, 叶春   

  1. 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京210008
  • 收稿日期:2012-03-03 修回日期:2012-11-11 出版日期:2013-04-10 发布日期:2013-04-10
  • 通讯作者: 刘元波(1969- ),男,研究员,博士生导师,主要研究方向为水文遥感。E-mail:ybliu@niglas.ac.cn
  • 作者简介:吴桂平(1980- ),男,博士,助理研究员,主要从事水文遥感及遥感图像处理方面研究。E-mail:gpwu@niglas.ac.cn
  • 基金资助:

    国家重点基础研究发展计划(2012CB417003);中国科学院知识创新工程重要方向项目(KZCX2-YW-337);中国科学院“百人计划”择优项目

Spatio-temporal variations of evapotranspiration in Poyang Lake Basin using MOD16 products

WU Guiping, LIU Yuanbo, ZHAO Xiaosong, YE Chun   

  1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, CAS, Nanjing 210008, China
  • Received:2012-03-03 Revised:2012-11-11 Online:2013-04-10 Published:2013-04-10

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摘要： 基于MOD16遥感数据集,统计分析了鄱阳湖流域2000-2010年地表蒸散量的年际和年内时空变化状况,探讨了不同地表类型下蒸散量的差异性变化特征。研究表明:①MOD16产品的精度能够满足鄱阳湖流域地表蒸散量时空变化分析的要求;②流域内平均蒸散量的年际波动较大,以2003年、2007年尤为突出,分别超出多年平均值49.28 mm和46.71 mm。ET空间格局呈现四周高、中间低的分布规律,尤其在高植被覆盖区蒸散量较大;③年内蒸散量呈单峰型分布,季节性变化特征明显,地表蒸散主要集中在5-9月份,最高值出现在7月;④土地利用特点基本影响着流域蒸散量的分布状况。蒸散强度大小按地表类型排序依次为林地>草地>农田>裸地>城镇。研究结果对鄱阳湖流域旱涝灾害成因分析、生态需水量研究等均具有一定的理论和实践参考意义。

关键词: MOD16, 鄱阳湖流域, 地表蒸散量, 时空分布, 土地利用类型

Abstract: Under the support of ArcGIS spatial analysis module,this paper mainly aims at mod16-ET product to conduct a systematic research on the spatial and temporal characteristics in the Poyang Lake Basin during 2000-2010.The results indicated that MOD16-ET product is more applicable for the analysis of spatio-temporal distribution characteristic of evapotranspiration.In addition to water bodies and wetlands,the average ET from 2000 to 2010 changed obviously,and the sudden ascent happened in 2003 and 2007,which exceeded the average ET value by 49.28 mm and 46.71 mm respectively.The spatial distribution of the ET had obvious regional characteristics.ET values in the central part of the basin are higher than those in the surrounding areas in terms of their spatial distribution,especially in the high vegetation coverage areas.Furthermore,the seasonal variation of ET shows a unimodal pattern,and its peak value occurs in July.The spatial distribution of ET is related to land cover characteristics,which have effect on the ET distribution in the Poyang Lake Basin,and the order of ET intensity by land cover types is woodland>grassland>farmland>unused land>building land.The results of the study are of great theoretical and practical significance to analyses of the cause of drought and effective use of water resources across the Poyang Lake Basin.

Key words: MOD16, Poyang Lake Basin, evapotranspiration, spatio-temporal variation, land-cover type