|Title:||水分收支法模擬土壤水分含量作為灌溉管理依據||Other Titles:||Soil Water Management According to the Results of Simulation of Soil Moisture Using a Water Budget Approach||Authors:||向爲民
|Keywords:||Soil water;Simulation model;Com;土壤水分;模擬模式;玉米||Issue Date:||Dec-1998||Publisher:||中華土壤肥料學會||Journal Volume:||1||Journal Issue:||4||Start page/Pages:||287-293||Source:||土壤與環境||Abstract:||
Efficient management of water could be attained through correct assessment of soil moisture, while irrigation was operated in upland. To attain this goal, a simple simulation model formulated by data of precipitation and pan evaporation was introduced to calculate the balance of water in field. The data required for analysis and validation of the model were adopted from irrigation experiment of spring crop of corn, 1988, located in Hsueh-Chia upland irrigation station in Chia-Nan area.Five surveyed data of soil moisture during initial growth stage (0-26 day after sowing, LAI ≦1), which were included in treatment A. were fitted by Least Squares method to get the parameters essential for this model, i.e., Ka, Kb (moisture exchange parameter between surface and subsoil) and Kc (the crop coefficient), respectively. Then the simulation of soil moisture in mid as well as late-seasons was made by using ka, kb and the crop coefficient curve. Another set of soil data surveyed in treatment B were also simulated for the validation of this model.
The results indicated parameters for this model were readily available from surveyed data at initial growth stage of corn，i.e., Ka=- 0.131 ±0.019，Kb= 134.58 ± 3.00, Kc=0.153 ± 0.097. And with this set of parameters, the status of soil moisture in mid and late seasons could be easily predicted through simulation. The correlation equation between observed and simulated data is: Estimated=0.9133 X (Measured) 一 17.298，n=21, R2=0.9354 and for data set of treatment B: Estimated=0.6756 X(Measured) + 42.913，n=25, R:=0.8505.
Accurate assessment of soil moisture of upland in Taiwan is easy and ready to be achieved, as long as simple climatology data and parameters from field experiment data were available. Hence, efficient management of irrigation is feasible and can be expected.
結果顯示利用玉米生育初期之調查資料可以順利取得模式的參數值；Ka=-0.131±0.019，Kb=134.58±3.00，Kc=0.153±0.097，且利用此一參數值模擬玉米生育中、後期的土壤水份含量；得到調查與推估值間的相關式為Estimated=0.9133× (Measured)-17.298，n=21，R2=0.9354取B灌溉處理的資料進行模擬，所得調查值與推估值的相關式為Estimated=0.6756 × (Measured) + 42.913，n=25，R2=0.8505。
|Appears in Collections:||農業化學組|
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