城市草地植被根系层土壤水分对降雨的响应及蒸散发特性  

Response of the soil moisture to rainfall andevapotranspiration in root layer of urban grassland vegetation

作　　者：罗迪文 黄金柏[1] 黄涌增 顾准 朱超凡 LUO Diwen;HUANG Jinbai;HUANG Yongzeng;GU Zhun;ZHU Chaofan(School of Hydraulic Science and Engineering,Yangzhou University,Yangzhou,225127,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225127

出　　处：《扬州大学学报（自然科学版）》2020年第5期39-44,共6页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41271046);扬州市科协资助项目(202068);扬州大学青蓝工程资助项目;2019年扬州大学科技创新培育基金资助项目(2019CXJ069).

摘　　要：利用土壤水分观测结果,分析不同降雨过程对土壤水分的影响;根据0~30 cm土层和根系层(0~10 cm)土壤含水量对表面阻抗rs等参数进行率定,并结合Penman-Monteith(P-M)公式得到相应土层小时蒸散发量ET30和ET10.结果表明,降雨前表层(0~5.5 cm)土壤水分越低,根系层降雨响应时间越短;未达到饱和前,随着雨强增大,土壤水分增速变快,且25 cm及以下土层土壤水分受降雨影响较小;ET 10约占ET 30的78%,即蒸散发所消耗的水分主要由根系层提供.研究结果为城市化背景下草地植被土壤水分运动的深入研究提供基础数据.Based on the observation results of soil moisture,the effects of different rainfall processes on soil water are analyzed.The surface resistance parameters(rs)are calibrated according to the soil water content for the depths of 0—30cm and of the root layer(0—10 cm).Penman-Monteith(P-M)model is adopted to calculate the hourly ET 30 and ET 10 in the corresponding soil layers.The results indicate that the response time for the soil water in root layer is much shorter with the less soil water in the topsoil(0—5.5cm),the increase rate of soil water raises with the increase of rainfall intensity in the unsaturated state,the soil water of 25 cm and below is less affected by rainfall.ET 10 accounts for about 78%of ET 30,which demonstrates the water consumed by ET is mainly provided by the soil water in the root layer.The results provide basic data for the further researches on the soil water movement of grassland vegetation under the background of urbanization.

关 键 词：草地植被 降雨 蒸散发 土壤水分 

分 类 号：S152.7[农业科学—土壤学]