Characteristics Of Agricultural Climate Resources Changes In Dabie Mountain Area And Evaluation Of Tea Climate Production Potential Under The Background Of Climate Chang

Based on the historical meteorological data of 35 national meteorological stations in the Dabie Mountains from 1971 to 2020 and ASTER GDEM 30-meter resolution digital elevation data,this paper adopts commonly used climate statistical analysis methods,stepwise correction method and spatial interpolation of meteorological elements.The spatial-temporal variation characteristics of basic agroclimatic resources and agroclimatic resources of the main growing season of crops in the last 50 years were analyzed,and the spatial-temporal distribution characteristics of spring frost of tea in Dabie Mountain area were analyzed,and the potential production of photosynthesis,light temperature and climate were evaluated.It is expected to provide theoretical basis for agricultural industry in Dabie Mountain area to cope with climate change,make full use of climate resources,efficiently seek benefits and avoid disadvantages,and rationally optimize industrial layout,which has positive practical guiding significance for scientific and efficient development of tea industry and help the industry to alleviate poverty.1.The spatial distribution characteristics of agroclimatic resources in Dabie Mountain area are obvious,and the heat resources have obvious latitudinal and altitudinal variation characteristics.The spatial distribution of all heat factors is increases from north to south and from high altitude to low altitude.The spatial distribution of sunshine duration basically showed a decreasing trend from north to south.The annual sunshine duration and the distribution characteristics of sunshine duration in each crop growing season were slightly different.The spatial distribution of precipitation basically showed an increasing trend from north to south and from low altitude to high altitude,while the spatial distribution of average relative humidity basically showed an increasing trend from north to south and from high altitude to low altitude.The spatial distribution characteristics of precipitation and relative humidity were slightly different in different crop growing seasons.2.The agroclimatic resources of Dabie Mountain area at the end of the 20th century to the early21st century significant mutations occur,and there were regional differences in the trend of agroclimatic resources change.The general heat resources were significantly increased,and the increasing trend is as follows:the north of Dabie Mountain area>the south of Dabie Mountain area>the core mountain area;the annual sunshine duration and the sunshine duration of rice,winter wheat,summer corn and rapeseed growing season in overall turbulence decline,the descending trend is as follows:the north of Dabie Mountain area>the core mountain area>the south of Dabie Mountain area,the sunshine duration in spring tea growing season have different trends with different area,specifically,the north of Dabie Mountain area is declining,and the south is increasing more than the core mountain area;the annual precipitation and precipitation in the growing season of rice and summer maize showed an overall trend of shock rise,the increasing trend is as follows:the core Mountain area>the south of Dabie Mountain area>the north of Dabie Mountain area,while the precipitation in the growing season of winter wheat,rape and spring tea showed a general trend of shock decline,The descending trend is as follows:the south of Dabie Mountain area>the north of Dabie Mountain area>the core mountain area,and the annual average relative humidity showed a general trend of decline in different degrees,the descending trend is as follows:the north of Dabie Mountain area>the south of Dabie Mountain area>the core mountain area.3.The number of spring frost occurrence days in Dabie Mountain area decreased significantly,and the trend of decline was more obvious in recent 10 years.The decreasing trend of spring frost occurrence days in northern Dabie Mountain area was greater than that in southern Dabie Mountain area.The average occurrence days of total spring frost,mild,moderate and severe spring frost were9.6,5.2,3.0 and 1.4 days respectively.4.In the growing season of tea in Dabie Mountains,the photosynthesis（Y_Q）,photo-thermal（Y_T）and climatic potential productivity（Y_W）showed different trends and spatial distribution characteristics.Y_Q showed a significant decreasing trend,Y_T and Y_w showed a non-significant increasing and decreasing trend,respectively.In spatial distribution,Y_Q increases from south to north,Y_T decreases from low elevation to high elevation and from south to north,and Y_W decreases from south to north and increases from low elevation to high elevation.The mean values of Y_Q,Y_Tand Y_W were 51.50,37.81 and 25.21 t·hm^-2,respectively.The promotion effect of temperature on Y_Wwas roughly offset with the inhibition effect of solar radiation and precipitation,resulting in a dynamic balance trend of Y_W.