Comparison of evapotranspiration and energy partitioning related to main biotic and abiotic controllers in vineyards using different irrigation methods  

作　　者：Lei GAO Peng ZHAO Shaozhong KANG Sien LI Ling TONG Risheng DING Hongna LU 

机构地区：[1]Center for Agricultural Water Research in China,China Agricultural University,Beijing 100083,China [2]Wuwei Experimental Station for Efficient Water Use in Agriculture,Ministry of Agriculture and Rural Affairs,Wuwei 733000,China

出　　处：《Frontiers of Agricultural Science and Engineering》2020年第4期490-504,共15页农业科学与工程前沿（英文版）

基　　金：This work was funded by the National Natural Science Foundation of China(91425302,51621061);by the 111 Program of Introducing Talents of Discipline to Universities(B14002).

摘　　要：Knowledge of evapotranspiration(ET)and energy partitioning is useful for optimizing water management,especially in areas where water is scarce.A study was undertaken in a furrow-irrigated vineyard(2015)and a drip-irrigated vineyard(2017)in an arid region of northwest China to compare vineyard ET and energy partitioning and their responses to soil water content(SWC)and leaf area index(LAI).ET and soil evaporation(E)and transpiration(T)were determined using eddy covariance,microlysimeters,and sap flow.Seasonal average E/ET,T/ET,crop coefficient(Kc),evaporation coefficient(Ke),and basal crop coefficient(Kcb)were 0.50,0.50,0.67,0.35,and 0.29,respectively,in the furrow-irrigated vineyard and 0.42,0.58,0.57,0.29,and 0.43 in the dripirrigated vineyard.The seasonal average partitioning of net radiation(Rn)into the latent heat flux(LE),sensible heat flux(H)and soil heat flux(G)(LE/Rn,H/Rn,and G/Rn),evaporative fraction(EF)and Bowen ratio(β)were 0.57,0.26,0.17,0.69 and 0.63,respectively,in the furrowirrigated vineyard and 0.46,0.36,0.17,0.57 and 0.97 in the drip-irrigated vineyard.The LE/Rn,H/Rn,EF,andβwere linearly correlated with LAI.The E,Kc,Ke,E/ET,LE/Rn,LEs/Rn(ratio of LE by soil E to Rn),H/Rn,EF andβwere closely correlated with topsoil SWC(10 cm depth).Responses of ET and energy partitioning to the LAI and SWC differed under the two irrigation methods.Drip irrigation reduced seasonal average E/ET and increased average T/ET.From the perspective of energy partitioning,seasonal average H/Rn increased whereas LE/Rn,especially LEs/Rn,decreased.Compared with furrow irrigation,drip irrigation decreased the proportion of unproductive water consumption thereby contributing to enhanced water use efficiency and accumulation of dry matter.

关 键 词：crop coefficient eddy covariance microlysimeter sap flow soil evaporation TRANSPIRATION 

分 类 号：S663.1[农业科学—果树学] S274[农业科学—园艺学]