摘要
先通过SEBAL模型估算了乌裕尔河下游沼泽旱地交错区1992年7月9日、1994年7月15日、1995年7月18日、1999年7月13日4个时相的日蒸散量,并通过P-M公式与作物系数进行时间尺度扩展得到了这4个时相所处月份的蒸散量,最后对日蒸散量、作物系数、月蒸散量的特征及其影响因素进行分析。结果表明:日蒸散量的频率分布图呈双峰结构,分别体现了旱地的蒸散特征、湿地与水体的蒸散特征;平均日蒸散量依照1994-07-15、1999-07-13、1995-07-18、1992-07-09的顺序依次降低;时相1994-07-15的平均日蒸散量与平均作物系数最高;通过逐步回归分析发现日平均风速、日照时数、日最低气温对参考作物日蒸散量的影响较为明显。
Daily evapotranspiration （ET） of 1992 - 07 - 09, 1994 - 07 - 15, 1995 - 07 - 18 and 1999 - 07 - 13 was estimated by using SEBAL model over lower reaches of Wuyu＇ er River. Monthly ET of July for each phase was obtained by using P - M equation and crop coefficient. Lastly, characteristics of daily ET, monthly ET, crop coefficient and their affecting factors were analyzed. The results indicated that： the frequency distribution maps of daily ET had two distinct apices, one was caused by the evapotranspiration characteristics of dry-land, and the other was caused by wetland and water-body; according to mean daily ET the sequence from high to low was 1994 - 07 - 15, 1999 - 07 - 13, 1995 - 07 - 18 and 1992- 07 - 09 ; the phase of 1994 - 07 - 15 presented the highest mean daily ET and mean crop coefficient; daily mean wind velocity, sunshine time and minimum daily air temperature played great influence on daily reference evapotranspiration. This study would provide important reference for the study of crop water requirement, ecological water demand, evapotranspiration characteristics of different land - use types and water resources management over the study area.
出处
《干旱地区农业研究》
CSCD
北大核心
2009年第5期216-224,234,共10页
Agricultural Research in the Arid Areas
基金
中国科学院知识创新工程领域前沿项目(C08Y46)
国家自然科学基金项目(40871187)
关键词
遥感
蒸散
SEBAL
P—M公式
作物系数
remote sensing
evapotranspiration
SEBAL
P - M Equation
crop coefficient
