Sensitivity analysis of the SWAP(Soil-Water-Atmosphere-Plant)model under different nitrogen applications and root distributions in saline soils  

作　　者：Guoqing LEI Wenzhi ZENG Yonghua JIANG Chang AO Jingwei WU Jiesheng HUANG 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072(China) [2]School of Remote Sensing and Information Engineering,Wuhan University,Wuhan 430079(China) [3]State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079(China)

出　　处：《Pedosphere》2021年第5期807-821,共15页土壤圈（英文版）

基　　金：the financial support from the Major Program of the National Natural Science Foundation of China(Nos.51879196 and 51790533);the China Postdoctoral Science Foundation Funded Project(No.2020M682475);the Fundamental Research Funds for the Central Universities,China(No.IWHR-SKL-KF201814)。

摘　　要：Sensitivity analysis is important for determining the parameters in the model calibration process.In our study,a variance-based global sensitivity analysis(extended Fourier amplitude sensitivity test,EFAST)was applied to an agro-hydrological model(the SWAP(Soil-Water-Atmosphere-Plant model)model).The sensitivities of 20 parameters belonging to 4 categories(soil hydraulics,solute transport,root water uptake,and environmental stresses)for the simulated accumulated transpiration,dry matter(DM),and yield of sunflowers were analyzed under three nitrogen application rates(N1,N2,and N3),four salinity levels(S1,S2,S3,and S4),and three root distributions(R1,R2,and R3).The results indicated that for predominantly loamy soils,the high-impact parameters for accumulated transpiration,DM,and yield were the soil hydraulic parameters(αand n),critical stress index for compensatory root water uptake(ωc),the salt level at which salt stress starts(Pi),the decline of root water uptake above Pi(SSF),residual water content(θr),saturated water content(θs),and relative uptake of solutes by roots(TSCF).We also found that nitrogen application did not change the order of the parameter impacts on accumulated transpiration,DM,and yield.However,TSCF replacedαas the highest-impact parameter for the accumulated transpiration,DM,and yield at high salinity levels(S2 and S3).Furthermore,αwas also the highest-impact parameter for DM and yield under different root distributions,but the highest-impact parameters for transpiration wereωc,α,andθs under R1,R2,and R3,respectively.Nitrogen application could be neglected when considering the interactive effects of nitrogen application,salinity level,and root distribution on the transpiration,DM,and yield.Additionally,the mean values and uncertainties of the transpiration,DM,and yield were similar in all scenarios,except S3,which showed a sharp decrease in the mean values.We suggest determining the above eight parameters(α,n,ωc,Pi,SSF,θr,θs,and TSCF)and the saturated vertical hydraulic conductiv

关 键 词：accumulated transpiration agro-hydrological model dry matter hydraulic parameter SUNFLOWER YIELD 

分 类 号：S156.41[农业科学—土壤学]