| Difference of water utilization between irrigated and rainfed potato in the agro\|pastoral ecotone of northern China |
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| DOI：10.7606/j.issn.1000-7601.2023.04.12 |
| Key Words: potato irrigation rainfed water use efficiency APSIM-Potato the agro\|pastoral ecotone |
| Author Name | Affiliation | | TANG Jianzhao | Hebei Technology Innovation Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang, Hebei 050011, China | | WANG Rende | Hebei Technology Innovation Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang, Hebei 050011, China | | ZHOU Haitao | Zhangjiakou Academy of Agricultural Sciences, Zhangjiakou, Hebei 075000, China | | ZHANG Xinjun | Zhangjiakou Academy of Agricultural Sciences, Zhangjiakou, Hebei 075000, China | | GUO Fenghua | Hebei Technology Innovation Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang, Hebei 050011, China | | LIU Jianfeng | Hebei Technology Innovation Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang, Hebei 050011, China | | XIAO Dengpan | College of Geography Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China | | BAI Huizi | Hebei Technology Innovation Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang, Hebei 050011, China |
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| Abstract: |
| In order to reveal the impacts of “irrigated to rainfed” on potato yield and water utilization in the agro\|pastoral ecotone of northern China, in this study, 27 sites evenly distributed in the agro\|pastoral ecotone of northern China were selected. A fully validated APSIM\|Potato model driven by climate data, soil data and management data was used to simulate potato yield and water utilization under irrigated and rainfed conditions. Results showed that: potato yields ranged from 15 900 to 35 600 kg·hm2, from 16 400 to 34 800 kg·hm-2 and from 16 600 to 34 800 kg·hm-2 under continuous irrigation of 10 years, 20 years and 30 years in the agro\|pastoral ecotone of northern China, and the corresponding yields were 12 800~30 600, 13 900~29 100 kg·hm-2 and 12 700~25 500 kg·hm-2 under the rainfed condition. The irrigated potato yield was higher in the western agro\|pastoral ecotone (APE), and the rainfed yield was higher in the eastern APE. Soil water content before planting were 163~388 mm, 161~394 mm and 154~398 mm under continuous irrigation of 10 years, 20 years and 30 years, and the values decreased by 31.8%, 35.3% and 36.9% under rainfed condition. The groundwater consumptions were 5 360~21 330 m3·hm-2, 8 910~43 680 m3·hm-2 and 19 920~65 770 m3·hm-2 under continuous irrigation of 10 years, 20 years and 30 years, and the consumption of groundwater was higher in the western APE. Under rainfed condition, the groundwater recoveries were 860, 1 445 m3·hm-2 and 1 580 m3·hm-2, and the recovery was higher in the eastern APE. Water use efficiency of potato ranged from 54.8 to 94.6 kg·hm-2·mm-1, from 54.7 to 93.2 kg·hm-2·mm-1 and from 54.6 to 93.9 kg·hm-2·mm-1 under continuous irrigation of 10 years, 20 years and 30 years, and the values decreased by 2.7%, 1.1% and 6.0% under rainfed condition. The results of our study can be helpful for decision\|making departments to adjust potato planting pattern based on the local water resources condition. |
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