Study on Relationship Between Meteorological Factors and Grain Crops in Drought-Prone Areas of Songnen Plain from 1971 to 2020
To explore the effects of temperature and precipitation changes on corn and rice in drought-prone areas of Songnen Plain,based on the data of temperature,precipitation and yield from 10 meteorological stations in Qiqihar City during 1971 to 2020,the long-term change trends of temperature and precipitation in the growing season of crops in the study area were analyzed by using linear trend fitting,multiple linear regression and R/S analysis.And the relationship model between meteorological factors and meteorological yield of maize and rice was established,the future change trends of temperature and precipitation were explored.Results showed that during 1971-2020 growing season,monthly average temperature and minimum temperature showed an increasing trend,while the maximum temperature had no significant change.The precipitation in the growing season increased significantly,and the monthly precipitation showed a slight fluctuation upward trend.The number of years with abnormal or close to abnormal cold(warm)during the growing season and each month was 27 years,the cold years were mainly concentrated in the 1970s to 1980s,the warm years were mainly in the 21st century.And the number of years with abnormal or close to abnormal precipitation was 24 years,mainly in the 1990s.The minimum temperature,the maximum temperature and the precipitation in August and the mean temperature in July were correlated with the meteorological yield of maize(P＜0.05).The maximum temperature,the minimum temperature and the precipitation in September and the minimum temperature in July were correlated with the meteorological yield of rice(P＜0.05).The results indicated that the water and heat conditions from midsummer to early autumn significantly influenced the yield formation of maize and rice.In the future,the temperature and precipitation conditions of crop growing season in the study area will continue to show a warm and humid trend,and there is still a large space for the utilization of local climate resources by maize and rice.
Hurst indexspatial and temporal distribution of temperature and precipitationQiqiharSongnen Plaindrought-prone areascornrice
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