浑善达克沙地蒸散发时空变化及植被和气候响应  

Spatiotemporal variability of evapotranspiration and its responses to vegetation and climate in Otindag sandy land

作　　者：刘宏宇 宁小莉[1] 海全胜[1] 解云虎 刘美萍 LIU Hongyu;NING Xiaoli;HAI Quansheng;XIE Yunhu;LIU Meiping(Baotou Teachers′College,Inner Mongolia University of Science&Technology,Baotou014030 China)

机构地区：[1]内蒙古科技大学包头师范学院,包头014030

出　　处：《干旱区资源与环境》2022年第8期110-118,共9页Journal of Arid Land Resources and Environment

基　　金：包头师范学院科研项目(BSYKJ2021-ZQ04);国家自然科学基金青年基金项目(41901009);内蒙古自治区科学技术厅项目(201605052)资助。

摘　　要：蒸散发对于干旱半干旱区水资源管理具有重要意义,文中基于2001-2021年MODIS全球蒸散发产品,利用植被覆盖度和气象数据,采用Theil-Sen Median斜率估计、Mann-Kendall检验和偏相关分析等方法,分析浑善达克沙地近20年蒸散发的时空变化及植被和气候响应。结果表明:浑善达克沙地年均蒸散发为144.14~257.82mm,总体呈增加趋势;空间分布上东部高,中西部低,分异特征明显;大部分区域呈显著或极显著增加趋势,极小部分出现减少趋势;整个区域变异程度较小,不稳定的区域主要集中在呼日查干淖尔南部;年内变化呈先增加后减少趋势,7月达到最大值;季节上在夏季的年际变化斜率最大,冬干冷温气候区和冷性草原气候区变化趋势一致;蒸散发与植被呈显著正相关的区域主要分布在多伦县;蒸散发与气温和降水均成正相关,与降水的偏相关强度高于气温。Evapotranspiration(ET)is of great significance for water resources management in arid and semi-arid regions.Based on the MOD16 A2 data from 2001 to 2021,the meteorological data,and fractional vegetation cover(FVC),we use Theil-Sen Median slope estimation and Mann-Kendall test,and partial correlation analysis to analyze trend of ET and its responses to vegetation and climate in Otindag sandy land.The results show that the annual average ET in Otindag sandy land is 144.14 mm to 257.82 mm and shows an increasing trend.The spatial differentiation characteristics of ET are obvious,which are higher in the east and lower in the mid-west.Most areas of the study area show significantly increasing trend,while a small part shows a decreasing trend.The overall spatial variability of ET is stable,and the degree of spatial variability is higher in the south of Huri Chagannoor.The interannual variation of ET shows increase firstly and then decrease and reach the maximum value in July.Interannual variabilities of the slope of ET are the largest in summer,and the variation trend of the cold temperate zone with dry winter is consistent with the change of the cold steppe zone.The areas with a significant positive correlation between ET and FVC are concentrated in Duolun County.The correlations between ET with air temperature and precipitation are positive,and the intensity of the partial correlation with precipitation is slightly larger than that of air temperature.

关 键 词：蒸散发 时空变化 响应 浑善达克沙地 

分 类 号：S161.4[农业科学—农业气象学]