摘要
研究锡林郭勒盟潜在蒸散量(PET)和干燥指数(IA)的时空分布特征,了解该地区的干旱状况,对进一步研究该地区植被状况、环境变化和农业水资源管理具有重要意义。利用研究区及周边共11个气象站点1957-2016年的气象资料,根据彭曼蒙特斯模型(P-M模型)和干燥指数(IA)计算公式,得到潜在蒸散量(PET)和IA值,采用3种突变检测方法、径向基函数插值法和偏相关分析,探讨了PET和IA的时空变化特征及其影响因素。研究结果表明:研究区1957-2016年多年平均PET为875.82 mm,多年平均IA为0.6156,均呈增加趋势;PET年内分布主要集中在夏季,占比达46.28%,冬季最小,占比仅有4.15%,IA春季最大,最为干旱,夏季最小,相对湿润;PET和IA均呈自东北向西南增加的趋势;PET在1984和1998年发生突变,IA在1998和2001年发生突变;PET和IA对风速敏感程度最强。1957-2016年研究区干旱化程度呈增加趋势,多年统计表明春季最旱,空间分布上由东北至西南干旱化程度增加。
[Background]To study the spatial and temporal distribution characteristics of potential evapotranspiration(PET)and drying index(IA)in Xilingol League and to understand the drought situation in this area are of great significance for further study of vegetation status,environmental change and agricultural water resources management in this area.[Methods]Based on the meteorological data of 11 weather stations in and around the study area from 1957 to 2016,the PETand IAvalues were obtained using Penman-Montes model(P-M model)and IAformulas.Three mutation detection methods,radial basis function interpolation method and partial correlation analysis were used to explore the temporal and spatial characteristics of PETand IAand their influencing factors.[Results]From 1957 to2016,the average PETwas 875.82 mm and IAwas 0.6156,which showed an increasing trend;the distribution of PETwas mainly concentrated in summer,accounting for 46.28%,the smallest in winter,accounting for only 4.15%,the largest in spring,the driest in summer,the smallest in relative humidity.Both PETand IAshowed an increasing trend from northeast to southwest;the mutation of PET occurred in 1984 and 1998,IAabrupt change occurred in 1998 and 2001;PETand IAwere the most sensitive to wind speed.[Conclusions]The degree of drought in the study area increased from 1957 to2016.Statistics for many years showed that the drought was the most severe in spring,and the degree of drought in spatial distribution increased from northeast to southwest.
作者
马梓策
于红博
曹聪明
张巧凤
MA Zice;YU Hongbo;CAO Congming;ZHANG Qiaofeng(College of Geographical Science,Inner Mongolia Normal University,010022,Hohhot,China)
出处
《中国水土保持科学》
CSCD
北大核心
2019年第6期19-26,共8页
Science of Soil and Water Conservation
基金
国家自然科学基金“锡林河流域蒸散量估算模型建立及长时间序列蒸散分析研究”(41661009)
内蒙古自然基金“锡林郭勒草原长时间序列干旱监测及对植被的影响研究”(2017MS0408)
内蒙古教育厅“锡林郭勒草原干旱灾害风险评估研究”(NJZY17047)
关键词
潜在蒸散量
干燥指数
气候因子
变化趋势
锡林郭勒盟
potential evapotranspiration
drying index
climate factors
tendency
Xilingol League
