基于DNDC的春玉米水肥耦合优化方案模拟研究

doi:10.12118/j.issn.1000-6060.2025.036

Abstract

Abstract:

To investigate the effects of reducing the use of traditional fertilizers and substituting them with organic fertilizers on the growth of spring maize (Zea mays L.) under different irrigation gradients, we used a combination of field trials and crop growth modeling. Fully (75%-95% of field capacity) and partially (55%-75% of field capacity) irrigated gradients were set. Additionally, three modes of fertilizer addition, traditional, traditional reduced by one-third, and traditional reduced by one-third+organic fertilizer, were set based on the local fertilizer application rates of 225 kg·hm⁻². The effects of different water-fertilizer combinations on the yield and water use efficiency of crops in the Minqin Oasis, Gansu Province, China, could be ascertained based on a quantitative analysis using the DNDC model. The results showed that: (1) The Nash coefficients (ME) of the simulated and measured values of the standard and validation periods during 2022—2023, employing the DNDC model, were in the range of 0.72-0.98, and the coefficients of determination (R²) were >0.80. (2) The validated DNDC model exhibited good applicability in simulating the growth rates of maize plants in the Minqin Oasis. (3) The yield under different water-fertilizer application scenarios varied; that with T_240-40% (40% organic fertilizer) treatment was 1.08% lower than that with T_300-40% (40% organic fertilizer) treatment; while water use efficiency and irrigation water use efficiency increased by 17.40% and 23.65%, respectively; and the partial fertilizer productivity improved by 1.07%. T_240-40% was the most optimal water-fertilizer treatment scheme. The results of this study can provide a theoretical basis for improving the water-fertilizer use efficiency of spring maize in the Minqin Oasis.

Key words: DNDC model, maize, yield, water use efficiency, partial fertilizer productivity

LI Haolin, ZHANG Xuejie, ZHANG Hongjuan, SUN Li’na, SONG Pengcheng, LI Ping. Simulation study on water and fertilization coupling optimization scheme of spring maize based on DNDC model[J].Arid Land Geography, 2025, 48(12): 2099-2110.

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处理	灌溉梯度	施肥
处理	灌溉梯度	施肥类型	施肥量/kg·hm^-2
W1F1	充分灌溉75%~95%θ_f（W1）	传统肥（F1）	225
W1F2		传统肥减量（F2）	150
W1F3		传统肥减量+有机肥（F3）	150+75
W2F1	胁迫灌溉55%~75%θ_f（W2）	传统肥（F1）	225
W2F2		传统肥减量（F2）	150
W2F3		传统肥减量+有机肥（F3）	150+75

土壤参数		作物参数
参数类型	取值	参数类型	取值
土壤质地	砂壤土	最高产量/kg·hm^-2	6993.00
土壤容重/g·cm^-3	1.37	总需氮量/kg·hm^-2	125.82
田间持水率/cm³·cm^-3	0.20	生长积温/℃	2550.00
孔隙度	0.48	需水量/mm	150.00
pH值	9.60	最适温度/℃	30.00
表层土壤有机碳/g·kg^-1	1.00	固氮系数	1.00

情景处理	灌水定额/m³·hm^-2	施肥类型	有机肥施肥量/kg·hm^-2
T_300-100%	300	100%有机肥	225
T_300-80%		80%有机肥	180
T_300-60%		60%有机肥	135
T_300-40%		40%有机肥	90
T_300-20%		20%有机肥	45
T_240-100%	240	100%有机肥	225
T_240-80%		80%有机肥	180
T_240-60%		60%有机肥	135
T_240-40%		40%有机肥	90
T_240-20%		20%有机肥	45
T_180-100%	180	100%有机肥	225
T_180-80%		80%有机肥	180
T_180-60%		60%有机肥	135
T_180-40%		40%有机肥	90
T_180-20%		20%有机肥	45
T_120-100%	120	100%有机肥	225
T_120-80%		80%有机肥	180
T_120-60%		60%有机肥	135
T_120-40%		40%有机肥	90
T_120-20%		20%有机肥	45

Simulation study on water and fertilization coupling optimization scheme of spring maize based on DNDC model

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