摘要
蒸散发(ET)是水文能量循环和气候系统的关键环节,研究ET的时空变化特征及其响应土地利用和气候变化的驱动机制对于理清流域水资源和气候变化的关系具有重要的意义。本文基于MOD16/ET数据集定量分析了海河流域2000-2014年ET的时空变化特征,并结合时序气温降水数据和土地利用数据,采用相关分析方法定量探索了ET与气候因子的驱动力关系。结果表明:①海河流域2000-2014年ET表现为较为显著的空间分布格局,呈现出北部和南部高、西北部和中东部低的分布特性。不同土地利用类型的多年ET呈林地>草地>耕地>其他类型的特征;②2000-2014年海河流域年均ET波动范围为371.96~441.29 mm/a,多年ET的均值为398.69 mm/a,平均相对变化率为-0.41%,整体呈下降趋势;③多年月ET与气温和降水均呈单峰型周期性变化趋势,年内月ET呈单峰变化趋势;④春秋两季的ET与降水和气温的相关性明显高于其他季节,ET与气温和降水的平均相关系数是-0.17和0.37,表明降水对于ET的响应程度强于气温;⑤驱动分区结果表明海河流域ET受气候因子驱动的主要类型是降水驱动型和降水、气温共同驱动型;⑥海河流域耕地ET变化气候因子驱动模式主要是降水、气温共同驱动型;林地、草地的驱动模式主要气温驱动型和降水驱动型,其他土地利用类型的驱动模式主要是受其他因素驱动。该研究将对海河流域水资源开发管理和区域气候调节起到科学指导作用。
Evapotranspiration(ET)is the key element linking surface water balance and hydrological energy cycle.Studying the spatiotemporal variations of ET and its driving climatic factors is of great significance for clarifying the relationship between water resources and climate change.Based on the MOD16/ET dataset,this paper quantitatively analyzed the temporal and spatial variations of ET in the Haihe River Basin from 2000 to2014.Based on the long-term observation data of air temperature and precipitation,the correlation analysis method was used to quantitatively explore the relationships between ET and various climatic factors.Results show:(1)The ET of the Haihe River Basin from 2000 to 2014 showed a relatively significant spatial distribution pattern,with higher values in the north and south,and lower values in the northwest and middle east.Distribution of the inter-annual ETs of different land use types showed a decreasing pattern for forest land,grassland,cultivated land,and other types.(2)The annual average ET of the Haihe River Basin from 2000 to 2014 ranged from 371.96 mm/a to 441.29 mm/a,with an average of 398.69 mm/a.The average relative change rate was-0.41%,which showed a downward trend.(3)The ET as well as climatic factors of air temperature and precipitation in 2000-2014 showed a uni-modal periodic variation trend,and the monthly ET showed a single peak trend within the year.(4)The correlation between ET and precipitation/air temperature in spring and autumn was significantly higher than other seasons,with their average correlation coefficients being-0.17 and0.37,respectively.This indicates that ET is positively related with precipitation and negatively related with air temperature.(5)The majority types of ET changes in the Haihe River Basin were precipitation driven as well as precipitation and air temperature combination driven.(6)The climate factor driving mode of cultivated land ET change in Haihe River Basin was mainly precipitation and temperature;the driving mode of forest land and grassland was mainly air temperature and precipitation,while the drivers of other land-use types were mainly other factors.Our findings provide scientific guidance for water resource development management and regional climate regulation in the Haihe River Basin.
作者
黄葵
卢毅敏
魏征
陈鹤
张宝忠
马文津
HUANG Kui;LU Yimin;WEI Zheng;CHEN He;ZHANG Baozhong;MA Wenjin(Key Lab of Spatial Data Mining and Information Sharing of Ministry of Education,Fuzhou University,Fuzhou 350002,China;Academy of Digital China(Fujian),Fuzhou 350002,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;National Center of Efficient Irrigation Engineering and Technology Research-Beijing,Beijing 100048,China)
出处
《地球信息科学学报》
CSCD
北大核心
2019年第12期1888-1902,共15页
Journal of Geo-information Science
基金
国家重点研发计划项目(2017YFB0503500、2017YFC0403202)
国家自然科学基金优秀青年科学基金项目(51822907)
中国水利水电科学研究院基本科研业务费专项(01881910、0145B102019、0145B492017)~~
关键词
蒸散发(ET)
时空特征
驱动因素
土地利用类型
气温
降水
海河流域
MOD16
Evapotranspiration(ET)
spatio-temporal characteristics
driving factors
land use types
air temperature
precipitation
Haihe River Basin
MOD16
