城市草地的小气候调节作用初步研究  

Microclimatic Modification of Urban Grassland in Beijing

作　　者：王修信[1] 胡玉梅[2] 刘馨[2] 高凤飞[2] 朱启疆[2] 

机构地区：[1]广西师范大学计算机科学与信息工程学院,广西桂林541004 [2]北京师范大学地理学与遥感科学学院遥感与地理信息系统研究中心

出　　处：《广西师范大学学报（自然科学版）》2007年第3期23-27,共5页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家重点基础研究发展规划"973计划"资助项目(G20000779);国家自然科学基金资助项目(40571109);北京市自然科学基金重点基金资助项目(4051003);北京师范大学与北京市教委共建资助项目(SYS100270431和JD100270540)

摘　　要：草地是城市绿地的重要组成部分,其对小气候环境的改善作用需定量评估。故于5月在北京使用涡度相关系统连续观测草地与裸地水热通量、CO2通量及其环境因素数值。结果表明晴天草地所获得的净辐射能量约1/2用于植被蒸腾和土壤蒸发,约13%用于显热;而裸地所获得的净辐射能量约1/3用于土壤蒸发,约2/5用于显热。中午草地温度比裸地温度最小低约10℃,比气温最大高约4℃。草地上水汽浓度比裸地最大高约3 g/m3,约高出1/3,具有增湿作用。在植被生长季节草地是CO2汇,是氧气的源,CO2通量日平均约-0.07 mgm-2.s-1。草地发挥着降温增湿、释氧固碳、调节小气候等生态效应。Grassland is an important part of urban green space. In this study heat, .water, carbon dioxide fluxes and the environmental variables were measured continuously with the eddy covariance systems over grassland and bare soil in May in Beijing. The results indicated about half of net radiation energy was change to transpiration and about 13% to sensible heat over grassland on sunny day. However, about one third of net radiation energy change to evaporization and about two fifth to sensible heat over bare soil. The temperature of grassland was 10% lower than that of bare soil at noon, and is higher than that of atmosphere. The vapor concentration over grassland was 3 g/m^3 more than that over bare soil, with good moisfure effect. During the growing season, grassland is the sink of carbon dioxide and the source of oxygen. The diurnal average of carbon dioxide flux reaches about -0. 07 mg· m^-2 · s^-1. Grassland has ecological effects on decreasing temperature, enhancing moisture, and modifying microclimate in urdan areas.

关 键 词：草地 小气候环境 调节作用 定量研究 

分 类 号：P343[天文地球—水文科学]