【摘要】 基于2016、2017年生长季原位气象监测数据,利用Shuttleworth-Wallace(S-W)模型模拟了科尔沁沙地主要固沙植物小叶锦鸡儿(Caragana microphylla)群落的蒸散发,对蒸散组分进行了拆分,并利用涡度相关系统对模拟蒸散发值进行了验证。结果表明:2016、2017年生长季小叶锦鸡儿群落蒸散发量分别为345.4、325.2 mm,土壤蒸发量分别为93.8、83.8 mm,植被蒸腾量分别为251.6、241.4 mm,土壤蒸发占总蒸散发分别为27.2%、25.8%。30 min尺度上模拟值与实测值一致性较高,模拟精度大体表现为晴天>阴天>雨天。持续干旱和降水后,小叶锦鸡儿蒸腾耗水规律明显不同,持续干旱时期小叶锦鸡儿保持较低的蒸腾耗水,且具有明显的"午休"现象,连续降水后小叶锦鸡儿"午休"消失,蒸腾耗水增强。饱和水汽压差是影响小叶锦鸡儿蒸散发的主要因子。更多还原

【Abstract】 This paper focus on the main sand-fixing vegetation Caragana microphylla in the Horqin Sandy Land, China. Based on routine meteorological data in growing seasons between 2016 and 2017, the actual evapotranspiration its components of Caragana microphylla community were simulated by Shuttle-Wallace(S-W) model. Simulated Evapotranspiration values were compared to the eddy covariance method. During 2016 growing season, the evapotranspiration of the community C. microphylla were founded to be 345.4 mm, which consisted of 93.8 mm of evaporation and 251.6 mm of transpiration. It means that evaporation accounted for 27.2% of evapotranspiration. During 2017 growing season, the evapotranspiration of the community C. microphylla were founded to be 325.2 mm, which consisted of 83.8 mm of evaporation and 241.4 mm of transpiration. It means that evaporation accounted for 25.8%. The simulated ET was close to the eddy covariance observed ET at the 30 min time-scale. The simulation performance of the S-W model for clear days was better than that for cloudy or rainy days. In the period of continuous drought and after precipitation, water consumption and transpiration of C. microphylla was different significantly. During drought period, C. microphylla maintained lower transpiration and appeared "midday depression". However after precipitation, the "midday depression" was disappeared, and transpiration was increased significantly. At last, we get conclusion that C. microphylla’s evapotranspiration was mainly affected by vapor pressure deficit.更多还原