锡林郭勒草原蒸散发月季动态及相关因子分析  

Monthly and Seasonal Dynamics of ET in Xilingol Steppe and Related Factors Analysis

作　　者：张巧凤[1,2,3,4] 刘桂香[2] 于红博[1,3] 玉山[1,3] 包玉海[1,3] 

机构地区：[1]内蒙古师范大学地理科学学院,呼和浩特010022 [2]中国农业科学院草原研究所,呼和浩特010010 [3]内蒙古自治区遥感与地理信息系统重点实验室,呼和浩特010022 [4]内蒙古防灾减灾与生态安全监测实验室,呼和浩特010022

出　　处：《水土保持研究》2017年第3期164-169,共6页Research of Soil and Water Conservation

基　　金：中国农业科学院创新工程"草原非生物灾害防灾减灾团队"(CAAS-ASTIP-IGR2015-04);国家科技支撑计划子课题(2013BAK05B01);国家自然科学基金(71263033);内蒙古科技计划项目"阿尔山森林灾害监测预警与应急管理系统研究"

摘　　要：蒸散发(Evapotranspiration,ET)的时空动态对理解水热对植被的影响具有重要作用。利用MODIS MOD16A2和MOD13A3月产品数据及气象数据,通过回归分析和相关分析等方法,研究了锡林郭勒草原不同类型草地近15年(2000—2014年)的ET月季动态及相关因子。结果表明:3—10月的ET均表现出草甸草原>典型草原和沙地植被>荒漠草原,1—2月和11—12月的ET均表现出草甸草原<典型草原和沙地植被<荒漠草原。荒漠草原11月ET最大,其余各类草原均在7月达到最大值;各类草原的最小ET均为5月。各类草原3—5月和10月的ET均为下降趋势,而1月、6月、7月和12月的ET均为上升趋势。春季、夏季和秋季的ET均表现出草甸草原>典型草原和沙地植被>荒漠草原,而冬季的ET表现出草甸草原<典型草原和沙地植被<荒漠草原。荒漠草原冬季ET最大,其余各类草原的ET均在夏季达到最大值。各类草原春季和秋季的ET均为下降趋势,而夏季和冬季的ET均为上升趋势。Pearson相关分析表明3—10月及春季、夏季和秋季的ET与NDVI和降水量显著正相关,与平均气温显著负相关(p<0.05);相反,1—2月、11—12月及冬季的ET与降水量负相关,而与平均气温显著正相关(p<0.05)。Spatiotemporal dynamic of evapotranspiration（ET）plays an important role in understanding the impact of water and heat on vegetation.In the present study,MODIS MOD16A2 and MOD13A3 monthly data and meteorological data were employed to analyze the spatiotemporal dynamics of monthly and seasonal ET in different types of grasslands in recent 15years（from 2000 to 2014）in Xilingol steppe and the correlation between ET and related factors by means of regression analysis and correlation analysis.The results showed that ET decreased from east to west in Xilingol steppe and in the sequence：meadow steppe〉typical steppe and sandy vegetation〉desert steppe from March to October.In contrast,ET increased from east to west in Xilingol steppe and in the order：meadow steppe〈typical steppe and sandy vegetation〈desert steppe in January,February,November and December.The max ET appeared in November in desert steppe,but it reached the maximum value in July in other types of grasslands.The min ET all appeared in May in different types of grasslands.In all types of grasslands,ET had the decreasing trend from March to May,and October,but in January,June,July and December,it had the increasing trend,but all the changes were not significant.In spring,summer and autumn,ET decreased from east to west with meadow steppe〉typical steppe and sandy vegetation〉desert steppe.In contrast,ET increased from east to west with meadow steppe〈typical steppe and sandy vegetation〈desert steppe in winter.The max ET appeared in winter in desertsteppe,but it reached the maximum value in summer in other types of grasslands.In all types of grasslands,ET had the decreasing trend in spring and autumn,but in summer and winter,it had the increasing trend,but all the changes were not significant.Pearson correlation analysis indicated that there was significant positive correlation（p〈0.05）between ET and NDVI and precipitation from March to October and in spring,summer and autumn.On the contrary,in January,February,November,December and

关 键 词：锡林郭勒草原 蒸散发 植被指数 气象要素 相关分析 

分 类 号：S812[农业科学—草业科学]