Estimation of evapotranspiration from artificial forest in mountainous areas of western Loess Plateau based on HYDRUS-1D model  

作　　者：LU Rui ZHANG Mingjun ZHANG Yu QIANG Yuquan CHE Cunwei SUN Meiling WANG Shengjie 

机构地区：[1]College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China [2]Key Laboratory of Resource Environment and Sustainable Development of Oasis,Gansu Province,Lanzhou 730070,China

出　　处：《Journal of Arid Land》2024年第12期1664-1685,共22页干旱区科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(42071047,41771035);the Basic Research Innovation Group Project of Gansu Province(22JR5RA129);the Excellent Doctoral Program in Gansu Province(24JRRA152).

摘　　要：Evapotranspiration is the most important expenditure item in the water balance of terrestrial ecosystems,and accurate evapotranspiration modeling is of great significance for hydrological,ecological,agricultural,and water resource management.Artificial forests are an important means of vegetation restoration in the western Loess Plateau,and accurate estimates of their evapotranspiration are essential to the management and development of water use strategies for artificial forests.This study estimated the soil moisture and evapotranspiration based on the HYDRUS-1D model for the artificial Platycladus orientalis(L.)Franco forest in western mountains of Loess Plateau,China from 20 April to 31 October,2023.Moreover,the influence factors were identified by combining the correlation coefficient method and the principal component analysis(PCA)method.The results showed that HYDRUS-1D model had strong applicability in portraying hydrological processes in this area and revealed soil water surplus from 20 April to 31 October,2023.The soil water accumulation was 49.64 mm;the potential evapotranspiration(ET_(p))was 809.67 mm,which was divided into potential evaporation(E_(p);95.07 mm)and potential transpiration(T_(p);714.60 mm);and the actual evapotranspiration(ET_(a))was 580.27 mm,which was divided into actual evaporation(E_(a);68.27 mm)and actual transpiration(T_(a);512.00 mm).From April to October 2023,the ET_(p),E_(p),T_(p),ET_(a),E_(a),and T_(a) first increased and then decreased on both monthly and daily scales,exhibiting a single-peak type trend.The average ratio of T_(a)/ET_(a) was 0.88,signifying that evapotranspiration mainly stemmed from transpiration in this area.The ratio of ET_(a)/ET_(p) was 0.72,indicating that this artificial forest suffered from obvious drought stress.The ET_(p) was significantly positively correlated with ET_(a),and the R^(2) values on the monthly and daily scales were 0.9696 and 0.9635(P<0.05),respectively.Furthermore,ET_(a) was significantly positively correlated with temperature,solar rad

关 键 词：potential evapotranspiration actual evapotranspiration EVAPORATION TRANSPIRATION HYDRUS-1D model Loess Plateau soil water content 

分 类 号：S715.4[农业科学—林学]