西辽河流域1952年~2007年参考作物蒸散量的变化趋势
Change Tendency of Reference Crop Evapotranspiration in Xiliaohe Basin
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文摘
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西辽河流域在区域和国家粮食安全中的地位重要,随着社会经济的发展,用水量增加导致水资源紧缺,参考作物蒸散量可为该区作物灌溉和区域灌溉需水量提供定量依据,本文采用Penman-Monteith模型计算了西辽河流域11个气象台站1952年~2007年来的月和年参考作物蒸散量,采用Kendall秩次相关法,对变化趋势进行了相关分析.研究结果表明:①西辽河流域多年平均蒸散量介于861~1330mm之间,空间分布呈现中部高,四周低的态势,月最高气温是西辽河流域年内参考作物蒸散量变化的主导因素;②近55年来,西辽河流域年际蒸散量变化整体呈增加趋势,但增加不显著,季节分布情况而言,多数站点春季和夏季参考作物蒸散量呈增加趋势,秋季和冬季呈减少趋势;③夏季蒸散量的变化是西辽河流域年蒸散量变化的主导因素. |
其他语种文摘
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Xiliaohe basin plays an important role in regional and national grain security. With the development of society and economy, water consumption increased dramatically, which has caused water shortage and in succession, caused various environmental problems, such as grassland degeneration, trees dwarfing and so on. Water shortage has become a primary limiting factor of agricultural development in Xiliaohe basin. Thus, practical irrigation system and plan have become a key step to effectively use water resources and formulate regional water resources planning. To formulate crop irrigation system and irrigation water plan, we must start from reference crop evapotranspiration. Penman Monteith is the most common method to research reference crop evapotranspiration domestically and abroad. This paper selected meteorological elements such as temperature, precipitation, wind, humidity, sunshine duration and others and used the Penman-Monteith equation to calculate monthly and annual reference crop evapotranspiration of the 11 weather stations in Xiliaohe River basin from 1952 to 2007. The meteorological data were provided by National Weather Service of China. The paper took Tongyu and Wengniute as two typical weather stations to analyze the change tendency of reference crop evapotranspiration by using Kendall's rank correlation method, the correlation between reference crop evapotranspiration and various meteorological factors .The resultes indicated: 1) The average reference crop evapotranspiration in Xiliaohe basin was 861 to 1330mm, and its spatial distribution in the middle part was higher than the surrounding areas; 2) The monthly reference crop evapotranspiration change in Xiliaohe basin was a single-peak curve from 1952 to 2006. There was an obvious seasonal variation: the value of reference crop evapotranspiration in summer was the highest throughout the year, while the lowest value appeared in winter. To specify, the peak value occurred in May, being followed by June, July and August; 3) The monthly highest temperature is the predominant factor of the seasonal change of reference crop evapotranspiration in the Xiliaohe basin. Sunshine duration mostly affected reference crop evapotranspiration in summer while the average temperature mainly affected reference crop evapotranspiration in winter; 4)For 55 years, the change tendency presented a slow increase in inter-annual reference crop evapotranspiration in Xiliaohe basin, and of most weather stations, reference crop evapotranspiration rose in spring and summer and dropped in autumn and winter. The change of reference crop evapotranspiration in summer was the predominant factor of its change in Xiliaohe basin. The results we reached in this research can provide decision support for local agricultural production, water resources utilization, regional ecological restoration and reconstruction. |
来源
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资源科学
,2009,31(3):479-484 【核心库】
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关键词
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参考作物蒸散量
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Penman-Monteith模型
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Kendall秩次相关法
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西辽河流域
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地址
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中国科学院,地理科学与资源研究所, 北京, 100101
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1007-7588 |
学科
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环境保护管理 |
基金
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国家自然科学基金
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文献收藏号
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CSCD:3520298
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