| Effects of climate warming on potato sowing time in the semi\|arid area of Loess Plateau in North Shanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2023.02.30 |
| Key Words: climate warming potato optimum sowing period yield semi\|arid area of Loess Plateau in North Shanxi Province |
| Author Name | Affiliation | | MA Yali | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | LUAN Qing | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | LI Xiaozhen | Datong Meteorological Bureau,Datong, Shanxi 037010, China | | LIU Wenping | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | LI Fen | Shanxi Meteorological Disaster Prevention Technological Center,Taiyuan, Shanxi 030032, China | | BAN Shenglin | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | LI Haitao | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | ZHANG Na | Shanxi Climate Center,Taiyuan, Shanxi 030006, China | | ZHANG Yiwei | Shanxi Climate Center,Taiyuan, Shanxi 030006, China |
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| Abstract: |
| Climate change mainly characterized by climate warming has a great impact on potato phenology, growth and yield. It is of great significance to study the change characteristics of potato heat resources and suitable sowing date in growing season for adjusting variety layout and rational utilization of climate resources.Based on the data of ground meteorological observation stations and agrometeorological observation stations from 1981 to 2016,the variation characteristics of potato climatic resources in North Shanxi Province and their impact on potato yield were studied by trend analysis and correlation analysis methods. Based on the principle of accumulated temperature stability, a meteorological yield prediction model was established to calculate the suitable sowing date of maximum meteorological yield, and the effect of climate change on potato trial sowing date was analyzed.The temperature of potato growing season in North Shanxi showed an increasing trend of 0.32℃·10a-1, and the accumulated temperature ≥5℃ had an increasing trend of 47.0℃·d·10a-1. The climatic factors that had a significant impact on potato yield in North Shanxi under the background of climate warming were mainly the average temperature in the emergence~branching period, the accumulated temperature, sunshine hours and water demand in the whole growth period, the emergence~branching period, the inflorescence formation period~availability,and the number of days with the highest temperature ≥30℃ in the whole growth period. Temperature and sunshine had basically negative effects, precipitation was a negative effect in the vegetative growth period, and a positive effect in the reproductive growth period. In North Shanxi Province, the optimum sowing period of potatoes tended to advance with climate warming. In 1980s, the optimum sowing period was from the end of early May to mid\|May. In 1990s, the optimum sowing period was in early May. In the first decade of the 21st century, the optimum sowing period was from late April to early May.After 2010, the optimum sowing period of potatoe advanced to mid\|late April to late April. It is suggested that mid\|late maturing varieties should be planted in the semi\|arid basin area of Loess Plateau in North Shanxi Province, and the sowing period should be as early as possible, mid\|late April to late April should be selected. Mid\|late maturing varieties should be planted at high altitude areas or early sowing date should be covered with plastic film, which can be sown from mid\|late April to early May. |
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