ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Multi-timescale Temperature Change in Puyang, Henan Province and Its Effects on Grain Production
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Abstract:
The characteristics of multi-timescale temperature change in Puyang, Henan Province and its effects on grain production caused by the warming-up climate are analyzed. The results are as follows. The temperatures in winter and in summer float respectively with the value 0.23—0.46℃/10a and -0.05—0.11℃/10a, while the annual average is 0.14℃/10a. The annual high temperature (daily maximum temperature as high as or higher than 35℃)/low temperature(daily minimum temperature as low as or lower than -10℃) day decrease at 3.36 days per 10-year and 2.35 days per 10-year. The first day when the average daily temperature keeps above 0℃ steadily shifts 4.91 days earlier per 10-year, while the last day shifts 1.02 days later per 10-year. Besides, the last day when the average daily temperature keeps above 20℃ steadily shifts 2.0 days later per 10-year. There have been 17 warm winters ever since 1987 in puyang, with the most typical ones happening after 1995.The breed of wheat introduced to Puyang gets weaker in winter nature with postponed sowing date, shorter overwintering period and longer growing period. As a consequence, plant diseases and insect pests tend to be more serious and much agricultural chemical and fertilizer have to be applied. It shows that the local climate is changing with the tendency of warmer winter and cooler summer. Therefore, the damage caused by high or low temperature decreases, the efficiency of accumulated temperature increases and plants obtain a longer growing and milking period. Ever since the mid-1990s, more events of unusual warm winter happen. The last ten-year are the warmest one for the last 50 years. Mean while, the annual change of the average temperature in winter is with larger amplitude, while the temperature in spring tends to be poor in stability. Although there exist more advantages for the local grain production in warmer climate, disadvantages stand out at the same time. It is necessary to study how to ensure grain safety by pursuing gains and avoiding losses.
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