Variation Of Accumulated Temperature In Heilongjiang Province In Recent 60 Years And Division Of Accumulated Temperature Zones

As a major agricultural province in my country,Heilongjiang Province is particularly important in agricultural production,and one of the most important factors affecting agricultural production is temperature resources.As one of the most important temperature indicators,accumulated temperature plays a key role in guiding agricultural production,improving the professional level of relevant practitioners,improving the planting structure of crops,and ensuring food security.Since the 1980 s,the phenomenon of climate warming has been unusually significant.In some areas of Heilongjiang Province,the accumulated temperature of ≥ 10℃ has exceeded3000 ℃ · d,resulting in the inconsistency between the planning of agricultural production and planting structure and the actual accumulated temperature,resulting in some heat resources.On the other hand,some farmers and growers have suffered serious low temperature disasters due to their blind pursuit of high-yield and cross-regional planting.Therefore,it is imperative to finely divide the accumulated temperate zone.Based on the daily average temperature data of 83 meteorological observation stations in Heilongjiang Province from 1961 to 2020,this paper uses the five-day moving average method to calculate the starting and ending dates,continuous days and accumulated temperature of ≥ 10 ℃ limit temperature in Heilongjiang Province from 1961 to2020.The temporal and spatial evolution trends of average temperature,≥ 10 ℃ accumulated temperature and continuous days in Heilongjiang Province in the past 60 years and the correlation between the four temperature indicators and the average temperature were analyzed.Using ACRGIS software,Kriging spatial interpolation method was used to interpolate them,and three methods were proposed.A new plan for accumulating temperature in Heilongjiang Province,drawing a new accumulating temperature zoning map,analyzing and discussing the future trend of accumulated temperature and its impact on agriculture,with a view to adjusting crop planting layout for Heilongjiang Province and coping with the effects of current climate change on crops.Influence,ensure stable and high yield,and formulate relevant policies in Heilongjiang Province to provide theoretical reference,in order to facilitate the sustainable development of agriculture in Heilongjiang Province.The main findings of this study are as follows:(1)From 1961 to 2020,the average temperature in Heilongjiang Province,the accumulated temperature of ≥10℃,and the continuous days of the limit temperature of ≥10℃ showed a significant increase in time,and the rate of increase was the largest in the 1990 s.The initial date of the limit temperature is continuously advanced,and the end date is continuously delayed.In terms of spatial distribution,there is a significant latitudinal distribution law,decreasing from the southwest of Heilongjiang Province to the east to the north.(2)The response degree of each temperature resource index in Heilongjiang Province to the change of annual average temperature is ≥10℃ accumulated temperature,continuous days,start date,and end date.The early start date has a higher response to climate warming than the late end date.(3)The accumulated temperature of ≥ 10℃ in Heilongjiang Province shows a significant increasing trend with the change of the year,and the accumulated temperature limit expands obviously to the north and east.From the perspective of spatial distribution,the range of accumulated temperature ≥2700℃·d has the most significant change,and the coverage area has rapidly changed from Heilongjiang to Heilongjiang.The southwestern part of the province expands to the southern and eastern parts of Heilongjiang Province,including most counties and cities in Heilongjiang Province,basically covering the first,second,and third accumulated temperature zones;the boundaries of regions belonging to 2700-2500℃·d expand to the north To the Nenjiang-Xunke-Aihui line in the original third accumulated temperature zone;the accumulated temperature in the original fourth accumulated temperature zone gradually increased to 2500-2300 ℃ · d;the accumulated temperature in the southern Jiagdaqi area of the Greater Khingan Mountains,which belonged to the original fifth accumulated temperature zone It reached2300-2100℃·d;the area of the original sixth accumulated temperature zone was further reduced,and the accumulated temperature in the southern region gradually increased to 2100-1900℃·d.(4)This paper proposes three schemes for the re-division of the accumulated temperature zone in Heilongjiang Province: Scheme 1 retains the division method of the original accumulated temperature zone in Heilongjiang Province and expands the area of high accumulated temperature zone;The temperature is raised to 2900℃,and the lower limit is raised to 2100℃;the third option reduces an accumulated temperature zone,increases the spacing to 300℃,the upper limit is raised to 2900℃,and the lower limit is raised to 2000℃.After comparative analysis,the author believes that for the re-division of the accumulated temperate zone in Heilongjiang Province,the second option is more suitable than the first and third options.