摘要
在田间试验观测基础上,采用SWAP模型分析黄河下游簸箕李引黄灌区农田排水再利用下的土壤盐分季节性变化以及地下水位对土壤盐分剖面分布的影响,模拟农田排水补灌对作物产量的效应。研究结果表明,咸排水补灌引起的土壤盐分积聚主要在冬小麦生长期,夏玉米生长期内并不明显,有效地控制地下水位有助于减少土壤盐分累积量,维系作物根区的盐分平衡。利用含盐量为4mg/cm3以下的农田排水在冬小麦生长后期水分亏缺阶段进行补灌,可在基本不影响随后夏玉米产量的基础上,不同程度地改善冬小麦产量。对缺水严重的黄河下游引黄灌区,农田排水再利用是缓解水资源供需矛盾、改善作物产量的一种有效水管理措施。
Based on on-farm observations and experiments, SWAP Model was used to analyze the seasonal variation of soil salt and impact of groundwater table on the distribution of soil salt under conditions of drainage water reuse in Bojili Irrigation District in the lower reaches of the Yellow River, and simulate the effect of supplementary irrigation by surface drainage water on crop's yield. It's indicated from the study that soil salt accumulation caused from saline drained-water irrigation occurs mainly in the growth period of winter wheat, not serious in the growth period of summer maize. The efficient control of groundwater table would simultaneously help to reduce the salt accumulated in the soil profile and thus help in maintenance of salt balance within root zone. The reuse of drainage water with salt content up to 4 mg/cm^3 for irrigate in winter wheat during later stage results in yield improvements over deficit irrigation without affecting the subsequent summer maize yields. The reuse of drainage water, thus offers opportunities for improving irrigation water management in winter wheat for the irrigation districts in the lower reaches of the Yellow River facing water shortage.
出处
《灌溉排水学报》
CSCD
北大核心
2004年第5期1-5,共5页
Journal of Irrigation and Drainage
基金
中国欧盟重大科技合作项目(ERBIC18CT970170)
