北京奥林匹克森林公园地表反照率动态及其影响因素  

Dynamics of surface albedo and its controlling factors in Beijing Olympic Forest Park

作　　者：郝文静 于海群 王华玺 周彩贤 张峰 田赟[1,2,4] 贾昕 查天山[1,2,4] HAO Wen-jing;YU Hai-qun;WANG Hua-xi;ZHOU Cai-xian;ZHANG Feng;TIAN Yun;JIA Xin;ZHA Tian-shan(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of State Forestry Administration on Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Liupanshan Forestry Department of Guyuan City,Jingyuan 756401,Ningxia,China;Beijing Engineering Research Center of Soil and Water Conservation,Beijing Forestry University,Beijing 100083, China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]水土保持国家林业局水土保持重点实验室(北京林业大学),北京100083 [3]宁夏固原市六盘山林业局,宁夏泾源756401 [4]北京市水土保持工程技术研究中心(北京林业大学),北京100083

出　　处：《生态学杂志》2019年第2期427-435,共9页Chinese Journal of Ecology

基　　金：北京市科技计划项目(Z171100002217030);国家自然科学基金项目(31670710;31670708);中央高校基本科研业务费专项(2015ZCQ-SB-02)资助

摘　　要：地表反照率是地表能量和水文循环的关键要素。本研究基于2013—2015年对北京奥林匹克森林公园城市绿地生态系统气象要素的连续观测,探讨城市绿地生态系统地表反照率的动态及其影响因素。结果表明:地表反照率日变化为08:30—12:00逐渐减小,12:00—17:00比较接近,早晨与下午的反照率差异为0.03,地表反照率日变化不对称的主要因素是早晨植物叶片表面的露水;地表反照率的季节变化特征为冬季(0.15)>春季(0.13)>秋季(0.12)>夏季(0.11),在生长期内,地表反照率受空气温度和土壤含水量的共同影响;在展叶期,地表反照率主要受空气温度的影响,与空气温度呈线性负相关,而与土壤含水量没有相关性;在完全展叶期和落叶期,地表反照率受空气温度和土壤含水量共同的影响,与空气温度和土壤含水量均呈负指数相关,但当空气温度大于24.0℃时,空气温度对其无影响。Surface albedo is a key factor of surface energy and hydrological cycles. Based on continuous monitoring of meteorological factors in an urban greenland in the Beijing Olympic Forest Park from 2013 to 2015,we explored the dynamics of surface albedo and its controlling factors.The diurnal variation in surface albedo gradually decreased from 08: 30 am to 12: 00 pm,and then remained relatively constant to 17: 00 pm. Surface albedo in the morning was 0. 03 higher than that in the afternoon. The asymmetry of daily surface albedo was due to the formation of dew on leaf surface in the morning. Surface albedo was the highest in winter( 0. 15) and lowest in summer( 0.11). Surface albedo in spring and autumn was 0.13 and 0.12,respectively. During the growing season,surface albedo was affected by temperature and soil water content. During leaf expanding period,surface albedo was mainly affected by air temperature but not by soil water content,showing a negative linear relationship with air temperature. During expanding leaf and deciduous periods,surface albedo was affected by both air temperature and soil water content,showing a negative exponential relationship with air temperature and soil water content. However,surface albedo was decoupled with air temperature when it was greater than 24.0 ℃.

关 键 词：城市绿地 地表反照率 空气温度 土壤含水量 

分 类 号：P422[天文地球—大气科学及气象学] X16[环境科学与工程—环境科学]