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| DOI：10.13522/j.cnki.ggps. 2023340 |
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| Change trend of water requirement of alfalfa and its response to climate warming in Northern of Shanxi Province |
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LI Mengwei, FAN Zihan, ZHAO Yongqiang, WANG Dayong,
MI Xiaonan, YANG Qian, LUAN Qing, CHANG Qing
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1. Shanxi Climate Center, Taiyuan 030006, China; 2. Shanxi Forestry and Grassland Engineering Station, Taiyuan 030000, China
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| Abstract: |
| 【Objective】To improve the quality production level of alfalfa (Medicago sativa L.) and high-quality development of green animal husbandry in northern Shanxi, it is necessary to adjust the crop structure of alfalfa to adapt to the impact of climate change. 【Method】Based on the method of Penman-Monteith equation modified by FAO, daily data of average temperature, relative humidity, precipitation, wind speed and sunshine duration at 6 meteorological stations in northern of Shanxi Province from 1972 to 2019 and the growth period data of Alfalfa were selected to analyze the spatio-temporal variation characteristics of water requirement of Alfalfa and the impact of climate change. 【Result】The results showed that the largest water requirement of alfalfa in growing season mainly concentrated in Huairen City and Shanyin County. Then Ying County, Pinglu District and Shuocheng District in the middle; Youyu County has the smallest ecological water requirement. The water requirement of alfalfa significantly decreased as a whole, the annual water requirement of alfalfa in northern of Shanxi Province was 751 mm and the average decrease was 11 mm/10 a. 【Conclusion】The water requirement of alfalfa was closely related to local meteorological conditions. Compared with other meteorological elements, the variations of wind speed and sunshine duration had more important effects on water requirement of alfalfa in northern of Shanxi. The increasing temperature increased the water requirement of alfalfa, the increase of water requirement in different regions was not completely equivalent, and the impact of climate warming on water requirement in mountainous areas and cold regions was more obvious. |
| Key words: climate warming; alfalfa; water requirement; Northern Shanxi |
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