Variation Law Of Meteorological Factors In Yanbian And Its Impact On Rice Yield

In order to clarify the changing law of meteorological factors in Yanbian Prefecture and the effect of climate change on rice yield,the meteorological data of Yanbian Prefecture from 1961 to 2019 and the rice yield data of Yanbian Prefecture from 1994 to 2018 were investigated.By Microsoft Excel 2010,Fortran,ArgGis 10.0 and SPSS 13.0 data statistical analysis,The changes of heat resources,water resources and light resources during the whole growth period of rice in 8 counties(cities)and 4 main production areas in Yanbian Prefecture were analyzed,and the effects of climate change on rice yield were studied,the rice yield model was established based on this model.The rice yield model can be used to guide production practice and has application value,the results show that(1)from 1961 to 2019,the heat resources in the growing season of rice in Yanbian Prefecture showed an increasing trend,and the heat resources showed a spatial distribution characteristic of high in east and low in west.There are differences in the heat conditions of different rice growing periods in different counties(cities)The annual precipitation during rice growing period has great variability,uneven spatial distribution and obvious regional difference.The average sunshine hours of rice in Yanbian Prefecture showed a slow decreasing trend,and the spatial distribution was more in the West and less in the east(2)from 1994 to 2018,the average sown area of rice in Yanbian Prefecture showed a fluctuating downward trend.The total yield of rice in Yanbian Prefecture was more than five million tons in 25 years,and the yield per unit area changed greatly in 25 years.(3)from 1994 to 2018,the percentage of increase or decrease in per unit yield of rice in adjacent two years in Yanbian Prefecture had a significant positive correlation with the mean maximum temperature and mean sunshine hours in growing season.In this paper,25 main meteorological indexes,including monthly average temperature,maximum temperature,minimum temperature,monthly precipitation and Sunshine Duration,were selected and correlated analysis was carried out.Finally,the main meteorological factors and critical period affecting rice yield were determined,and the regression equation was established and tested.The results showed that the rice yield model was ideal.