水利学报Issue(3)：29-36,8.
新型蒸渗仪及其在农田水文过程研究中的应用
A new large weighing lysimeter and its application to agro-hydrological process studies
摘要
Abstract
A large weighing lysimeter is installed at Yucheng Comprehensive Experimental Station for agro-hydrological studies.Features of the lysimeter include the following:1.Mass resolution equivalent to 0.016mm of water to accurately determine hourly evapotranspiration,groundwater evaporation and groundwater recharge simultaneously;2.A surface area of 3.14m2 and a soil profile depth of 5.0m to permit normal plant development,soil water extraction,soil water/groundwater exchanges and fluctuations of groundwater level;3.A special supply-drainage system to simulate field conditions of groundwater within the lysimeter,4.A soil mass of about 30Mg including both unsaturated and saturated loam.The soil mainly consists of mealy sand and light loam.The monitoring data indicate that during the growing period of winter wheat groundwater contributes16.6% of total evapotranspiration for water-table depth from 1.6m to 2.4m below ground surface.Excess irrigation reduces the amount of upward water flow from groundwater table and causes deep percolation to groundwater.关键词
GSPAC系统/蒸渗仪/蒸腾蒸发/水分转化/土壤水/地下水Key words
GSPAC system/weighing lysimeter/evapotranpiration/water exchanges/soil water/groundwater分类
农业科技引用本文复制引用
刘士平,杨建锋,李宝庆,李运生..新型蒸渗仪及其在农田水文过程研究中的应用[J].水利学报,2000,(3):29-36,8.基金项目
国家自然科学基金项目（49671013）和禹城综合试验站开放课题资助。 （）
