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| DOI：10.13522/j.cnki.ggps.2022665 |
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| Analysis of Water Supply and Demand Balance of Typical Crops in Rainfed Land of Loess Plateau in Inner Mongolia |
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WANG Guoshuai, XU Bing, TANG Pengcheng, TIAN Delong, ZHANG Chen, REN Jie, LI Zekun
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1. Institute of Water Resources for Pastoral Area Ministry of Water Resources, Hohhot 010018, China,
2. Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station,
China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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| Abstract: |
| water resources in the Loess Plateau are extremely scarce and supplies and demands of crop water under different hydrological year are not clear. This study takes maize in rainfed area of the Loess Plateau as the research object. Based on the daily meteorological data from 1981 to 2020 in the Loess Plateau, through the division of different hydrological years and based on the water balance theory, the water demand characteristics of maize at different growth periods and the relationship between water demand and precipitation were analyzed. The results showed that the water demand of Maize in the whole growth period was 499.6 mm, and the average water consumption intensity is 3.42 mm/d. The peak water consumption periods of maize is from three leaf to jointing stage and from jointing to tasseling stage, and the water consumption intensity is 4.42 mm/d and 4.85 mm/d, respectively. The water demand of maize was the largest in the three leaf to jointing stage and jointing to tasseling stage, accounting for 40.73% and 31.04% of the whole water demand, respectively. The precipitation in high, normal, low flow years can not meet the water demand of maize. The water surplus and deficit in the sowing to three leaf stage, three leaf to jointing stage, jointing to tasseling stage and tasseling to maturity stage of maize was 9.10, -67.5, 30.10 mm and -16.8 mm (high flow year); -2.30、-107.60、-42.2、-22.3 mm(normal flow year); -18.8, -142.9, -88.7, -37.9 mm(low flow year), respectively. It is necessary to take water supplement measures to ensure the growth of crops. The results of this study can provide reference for regulate and contrtol of agricultural water resources in the Loess Plateau area of Inner Mongolia. |
| Key words: Loess Plateau; hydrological year; maize; water demand; surplus and deficit; water consumption intensity |
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