| Cite this article: | 侯永浩,王楠,丁蓓蓓,等.灌溉总量限制条件下不同灌水频率对冬小麦产量及地下水变化的影响——以河北省太行山山前平原为例[J].灌溉排水学报,2022,(12):-. |
| HOU Yonghao,WANG Nan,DING Beibei,et al.灌溉总量限制条件下不同灌水频率对冬小麦产量及地下水变化的影响——以河北省太行山山前平原为例[J].灌溉排水学报,2022,(12):-. |
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| Effects of Different Irrigation Frequencies on Winter Wheat Yield and Groundwater Variations under the Limitation of a Fixed Irrigation Amount: A Simulation Study on a Piedmont Plain of Taihang Mountain in Hebei Province |
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HOU Yonghao1, WANG Nan1, DING Beibei1, ZHANG Xueliang2
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1.College of Land Science and Technology, China Agricultural University, Beijing;2.China Agricultural University
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| Abstract: |
| 【Objective】Quantitatively estimating the effects of limited irrigation amount during winter wheat growth period in a shallow groundwater overexploited region ─ a piedmont plain of Taihang Mountain in Hebei Province is very important. To solve the dilemma between water and food in this region, it is curial to explore an optimized water distribution scheme that could reduce yield loss and improve the efficiency of groundwater well irrigation.【Method】We designed three scenarios with the same irrigation quota of 90 mm but applying different irrigation frequencies, and simulated the winter wheat yield, variation rate of shallow groundwater table, and water balance in the soil profile (2 m deep) using a modified SWAT model. Based on the index of crop groundwater irrigation productivity, the optimized irrigation scheme of the 22 subbasins in the study area was selected. 【Result】①The scheme by applying two rounds of irrigation corresponding to the jointing and heading stages with the norm of 45 mm (i.e., “45 mm-twice” scheme) had the relatively highest winter wheat yield, with an average yield reduction of approximately 20% compared with the farmers’ historical irrigation schedule. ②The scheme by applying one round of irrigation at the jointing stage with the norm of 90 mm (i.e., “90 mm-once” scheme) would cause a relatively large percolation, so it has a better effect on groundwater conservation than the other two schemes; ③The percolation and actual evapotranspiration of the scheme by applying three rounds of irrigation with the norm of 30 mm (i.e., “30 mm-three times” scheme) was similar to that of the “45 mm-twice”scheme, but the soil evaporation is higher under the “30 mm-three times” scheme, while the crop transpiration is lower. Thus, the utilization efficiency of groundwater as irrigation source was higher under the “45 mm-twice” scheme. ④In order to maximize the contribution of well irrigation to increasing winter wheat yield, 13 subbasins (~54% of the study area) should applied the “90 mm-once” scheme, 8 subbasins (~40% of the study area) should applied the “45 mm-twice” scheme, and the “30 mm-three times” scheme was recommended for only one subbasin (~6% of the study area).【Conclusion】The limited irrigation scheme for winter wheat (limiting the irrigation quota to 90 mm) could mitigate the declining rate of the shallow groundwater table by 60-75%, but the winter wheat yield would decrease by 20-25% at the same time. Different regions should reasonably allocate the limited water resources according to the heterogeneous underlying surface. The optimized scheme with varied irrigation frequency should be selected with the consideration of the trade-off between groundwater conservation and crop production, to improve the efficiency of well irrigation in the study area. |
| Key words: limited irrigation scheme; irrigation frequency; winter wheat; crop groundwater irrigation productivity; SWAT model |
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