水稻生長模擬DSSAT模式參數最佳化與應用

傳統水稻灌溉以漫灌為主，並透過不同灌溉期距與灌溉水深來達到節水效果，因灌溉期距的調整會影響灌溉用水量及水稻產量。本研究選用臺灣嘉南農田水利會灌溉技術推廣中心於2018年及2019年一期作水稻試驗所取得之滲漏計試驗區12個坵塊資料。研究分析Decision Support System for Agrotechnology Transfer ( DSSAT)模式之參數最佳化值，並評估不同灌溉期距對水稻產量之影響。本研究利用Extended Fourier Amplitude Sensitivity Test ( EFAST)方法建立滲漏計試驗區12個坵塊之模式作物品種參數值，利用灰關聯度分析各坵塊之最佳參數組合。再將作物品種參數進行檢定，其結果為平均值之參數為最佳；臺南11號作物品種參數P1、P2R、P5、P2O、G1、G2、G3、G4，其分別為643.1、123.4、531.2、11.26、37.99、0.026、1.501、1.065。最後，灌溉期距調整對產量之影響，其結果為在不同灌溉期距之總水深與灌溉期距3天之灌溉總水深相比，而產量在灌溉期距為8天時最佳，其產量率可增加8.47 %，且可節水56.77 %。

關鍵字

水稻； DSSAT模式；灌溉期距；灰關聯分析

並列摘要

Traditional paddy field irrigation mainly uses flood irrigation and achieves water-saving effects through different irrigation intervals and irrigation water depths. The adjustment of irrigation intervals affects irrigation water consumption and rice yield. In this study,12 blocks of lysimeter obtained from the Irrigation Technology Extension Center of Taiwan Chia-Nan Irrigation Association in 2018 and 2019 were selected. The study analyzed the optimized parameter of the Decision Support System for Agrotechnology Transfer (DSSAT) model and further assessed the impacts of different irrigation intervals on rice. The Extended Fourier Amplitude Sensitivity Test (EFAST) method as used to establish the parameter values of the model crop varieties of the 12 plots in the lysimeter test area. The optimal parameter combination of each plot was analyzed using grey relational analysis. The crop variety (Tainan 11) parameters were tested, and the average value was the best. The crop variety parameters P1, P2R, P5, P2O, G1, G2, G3, and G4 were 643.1, 123.4, 531.2, 11.26, 37.99, 0.026, 1.501, 1.065, respectively. The different irrigation interval water depths were compared with the total irrigation water depth of 3 days, and the optimal rice yield was obtained when the irrigation interval was 8 days. The rice yield rate was increased by 8.47%, with 56.77% savings in water.