1研究区概况 - 水土保持学报.doc

平坦下垫面植被蒸散特征及对气象因素的响应研究 花圣卓1,2，蔡昕3，余新晓* （1.北京林业大学水土保持学院，100083，北京；2.水利部水土保持植物开发管理中心，100038，北京；3. 北京水保生态工程咨询有限公司，100055，北京） 摘要平原区植被非均一下垫面蒸散典型日变化分析表明，全天可分为四个阶段，。采用对应时间段取平均的方法分析月蒸散变化规律，其变化趋势与日变化相似。季节变化分析表明，4月蒸散缓慢增长，5月开始逐渐上升；6月~9月期间为蒸散高峰期且波动较大；10月开始蒸散迅速降低。蒸散与常规气象因子相关分析表明，太阳辐射：夏季春季秋季，夏季晴天夏季阴天；温度：夏季秋季春季，夏季晴天夏季阴天。量化常规气象因子对蒸散的影响效应表明，太阳辐射：夏季（0.3 W﹒m-2/ W﹒m-2）春季（0.0474W﹒m-2/ W﹒m-2）秋季（0.0525W﹒m-2/ W﹒m-2），夏季晴天（0.3585W﹒m-2/ W﹒m-2）夏季阴天（0.2510W﹒m-2/ W﹒m-2）；温度：夏季（ W﹒m-2-1）春季（2.3224W﹒m-2-1）秋季（1.3516W﹒m-2-1），夏季阴天（21.0650W﹒m-2-1）夏季晴天（18.0420W﹒m-2-1）。降水事件在短期内对蒸散的影响为负效应。 关键词：蒸散；组分；气象因素 中国分类号：S715.4 Study on the evapotranspiration features of vegetation over flat underlying surface and response to meteorological factors Hua Shengzhuo1,2, Cai Xin3, Yu Xinxiao1* （1. Beijing Forest University, 100083，Beijing, China；2. China National Administration Center for Seabuckthorn Development,100038,Beijing, China; 3. Beijing Water Conservation Ecological Engineering Consulting Co.,Lt, 100055, Beijing, China） Abstract: Evapotranspiration is the important component of ecosystem hydrological and energy-balance. This study analyzed the evapotranspiration feature over flat underlying surface based on eddy covariance in Badaling Forest Farm in Beijing. We analyzed the evapotranspiration components via PT-Fi model and response to meteorological factors. The results of typical daily evapotranspiration variation in non-uniform underlying surfaces showing that the whole day were divided into 4 stages, 0:00 to 5:00 and 20:00 to 24:00 (night)was stable stage, 5:00 to 12:00 was increasing gradually stage, 12:00 to 14:00was fluctuant stage and 14:00 to 20:00 was decreasing stage. 24h averaged evapotranspiration in one month show that evapotranspiration monthly variation was accordance with the change of daily variation, expect the curve was smoother. According to the seasonal variation, evapotranspiration increased slowly from April to May, from June to September, the evapotranspiration arranged in the fastigium,