草甸草原区羊草生育期蒸散量变化规律研究

Study on Evapotranspration Variation Law of Leymus Chinensis in Growth Period in Meadow Grassland

基于2005--2006年羊草生育期气象因子及生理因子野外观测试验数据，用联合国粮农组织FAO-56分册中最新双作物系数法以日为时段计算了羊草2个不同水文年的蒸散量。模拟计算的蒸腾、蒸发量与实际观测值间进行了拟合相关图、拟合优度参数法的有效性检验。用羊草生育期生理特性、冠层结构变化、气象要素和根系层土壤含水率变化对计算结果进行了分析，得出生育期各生长阶段蒸散量和日平均蒸散强度及它们的变化规律。

Based on the field experimental data of climate and physiology factors in the growth period of Leymus Chinesis （LC） from 2004 to 2006, the daily evapotranspiration of the LC in two different hydrology yeas are simulated by using new dual crop coefficient approach presented in the FAO-56. The correlogram analysis and goodness of fit test are conducted between simulation results and observation data. The simulation results are analyzed according to the physiology characteristic, canopy structures change, climate factors, and water content change in root zoon. The evapotranpiration, daily average evapotranpiration intensity and its variation law in, each growth period are gained.