| Effects of climate change on yield of summer maize in Ningjin County of Hebei Province |
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| DOI：10.7606/j.issn.1000-7601.2022.01.13 |
| Key Words: climatic yield summer maize typical low yield year typical high yield year |
| Author Name | Affiliation | | YANG Li | Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | | LIU Haijun | Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | | TANG Xiaopei | Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China |
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| Abstract: |
| The impact of climate factors on summer maize yield in typical years in plain area of Hebei Province, especially the impact of extreme climate factors, plays an important role in stable yield and high\|yield management of summer maize. In this study, M-K test and Senslope were used to analyze the climateand yield data of summer maize growth period from 1982 to 2018 in Ningjin County of Hebei Province. The summer maize yield was separated into climatic yield and trend yield by using HP filter. Then the relationship between climatic yield and climate change was analyzed. The years with large yield changes were selected, and the main climate factors were revealed. The results showed that the total sunshine hours (3.76 h·a-1), relative humidity (0.10%·a-1) and wind speed (0.01 m·s-1·a-1) in maize planting season decreased significantly, and the average temperature (0.03℃·a-1) and minimum temperature (0.05℃·a-1)increased significantly.The annual average of actual maize yield was 4 997 kg·hm-2, and the range of climatic yield was -1 649~932 kg·hm-2. The actual yield and trend yield showed a significant upward trend.Analysis of the impact of climate factors on summer maize yield in typical high yield and low yield years indicated that insufficient precipitation, especially at tasseling\|maturity period, and extreme high temperature at sowing\|jointing period significantly affected maize yield. In 1986 and 1991, the precipitation from tasseling to maturity was 32% and 43% less than the annual average, resulting in 56% and 29% yield reduction.From June 24 to 29 of 2009 during sowing to jointing period, the daily maximum temperature was about 40℃. After August 20, the precipitation reached 207 mm. The high temperature at seedling stage and excessive precipitation at later growth stage also reduced the yield by 25%. In summary, the slightly lower temperature during maize growth period, especially at jointing\|maturity period and sufficient precipitation were beneficial to maize yield. |
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