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《Ecology and Environmental Sciences》 2013-08
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Variation characteristics of reference crop evapotranspiration from 1960 to 2011 in Shandong province

WANG Xi;LIU Lanmei;XU Zhenghe;JIANG Lijuan;WANG Xiuru;Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, College of Soil and Water Conservation, Beijing Forestry University;School of Resources and Environment, University of Jinan;Beijing City Pinggu DistrictWater Bureau;  
To study variation characteristics of reference crop evapotranspiration(ET0) in Shandong province,this study chose Cheng Shantou Station which located in semi-humid areas,and Huimin Station,Jinan Station,Weifang Station,Dingtao Station and Yanzhou Station which situated in humid region to analyse decadal,inter-annual and annual variation tendency of ET0 by distance average analysis,regression analysis and geographical information system,using daily meteorological data from 1960 to 2011 provided by National Climatic Data Center.Influencing factors of ET0 were found through partial correlation analysis and standardized partial regression coefficient.The results showed that the decadal mean ET0 in semi-humid region was greater than that in humid region.Both the greatest and the smallest value of the mean ET0 were showed in 1970s.The maximum mean ET0 was 1 269.2 mm in Jinan Station,while the minimum was 900.8 mm in Cheng Shantou Station.In all of these stations,the greatest change of annual ET0 was in Jinan Station with the range of 351.9 mm,and the minimal change appeared in Dingtao Station with the range of 157.8 mm.The biggest inter-annual fluctuation was in Weifang Station with the standard deviation of 74.4 mm and the smallest was in Dingtao Station with the standard deviation of 51.4 mm.The annual ET0 decreased differently in these 6 stations,annual ET0 in Weifang Station and Yanzhou Station decreased very significantly,and it reduced significantly in Jinan Station and Dingtao Station.When it came to the spatial distribution regularities of annual average value of ET0,the sequence in descending was Jinan Station,Weifang Station,Huimin Station,Yanzhou Station,Dingtao Station,and Cheng Shantou Station.ET0 had higher values in summer and the lower ones in winter.In spring,the greatest average ET0 showed in central region,which reached 409.0 mm,while,it was only 237.2 mm in the northeast coastal zone.The spatial distribution of average ET0 in summer was somewhat similar to that of annual average ET0,but there was reduction in a small area taking Huimin Station as center.In autumn and winter,it was greater in the central and northeast area,the greatest in the northeast,the smaller in the southwest and northwest,and the smallest in the southwest.ET0 change curve of the five sites in semi-humid areas on annual scale was single peak type with the peak in June,the 162th day of the year,whereas,ET0 change in humid climate areas in a year showed double-peak curves,and the peaks occurred in May,the 150th day and autumn,and September,the 270th day respectively.The correlation between ET0 and meteorological elements in Shandong Province reached very significant level in addition to the lowest temperature in Cheng Shantou Station.Main meteorological elements which influenced ET0 variation in humid climate and semi-humid climate in Shandong Province were the highest temperature and the average temperature.
【Fund】: 水利部公益性行业科研专项(201201115)
【CateGory Index】: S311
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