The northward expansion of peanut cultivation in China is limited by the availability of heat resourc-es,and frost poses a significant challenge to peanut planting in Northeast China.Peanut is the 3rd largest crop in Li-aoning province,which is an important exporter of peanuts in China.This paper studied the hazard of frost to peanut cultivation from a disaster-causing perspective,which is of great significance for ensuring the area stability and pro-duction safety of oil crops in emerging production areas.Based on the daily minimum temperature data of 56 meteo-rological stations in Liaoning from 1961 to 2020,the number of spring and autumn frost days were identified,as well as the first and last frost dates during the peanut growing season.The risks of spring frost and autumn frost in peanut cultivation were evaluated and the adaptability of current sowing and harvesting periods in reducing the frost risk in Liaoning was assessed.The results showed that the risk of autumn frost increased from southwest to northeast in Lia-oning,while the risk of spring frost increased from south to north.The probability of daily frost occurrence exhibited an"S"shape during autumn and an inverse"S"shape during spring.It took approximately two months for the proba-bility to increase from 0%to 100%and vice versa.The safe growth period for peanuts in Northeast China can be de-fined as the time between the corresponding date of the sowing lower limit temperature and the date of first frost.Au-tumn frost has a greater impact on peanut cultivation in Liaoning compared to spring frost.To avoid autumn freezing damage in the highest risk areas such as Fuxin city,the north-central part of Shenyang city and Tieling city,which are the main peanut-producing regions in Liaoning,it is necessary to postpone the harvesting date.While spring freezing damage in most major peanut-producing regions in Liaoning can be avoided by postponing the sowing date,the impact on the harvesting date must also be considered.Frost and wet soil during the autumn harvesting period may pose new challenges.
frosthazardpeanutNortheast Chinalow temperature disaster
国家科技期刊平台
NSTL
万方数据
