Temporal and spatial variations of agriculture critical temperatures in Liaoning Province and their impacts on agricultural eco-environment

ObjectiveThis paper discussed the influence of agricultural critical temperature variation on agricultural production in the whole Liaoning Province under climate change background,which provided scientific basis for rational planning of agricultural production layout and full utilization of agricultural ecological resources to improve crop yield.MethodBased on the current climate change featuring global warming,daily temperature data of 22 meteorological sta-tions in Liaoning Province from 1960 to 2014 were used. Supported by Matlab and ArcGIS technologies,the analysis was carried by focusing on the temporal and spatial variation characteristics of agricultural boundary temperature in Liaoning province,which covered beginning day,ending day,average duration days and accumulated temperature,as well as its influence on agricultural production.ResultIn terms of 10℃agricultural critical temperature in Liaoning,The climatic tendency rate of beginning day was-0.445 d/10 years,and the climate tendency rate of ending day was 1.757 d/10 years, and the climate tendency rate of average duration days was 2.202 d/10 years,and the temperature tendency rate of the ac-cumulate temperature was 53.73℃·d/10 years. The beginning day of agriculture critical temperatures shifted earlier while the ending day postponed,the duration days became longer and accumulate temperature gradually increased from 1960 to 2014 in Liaoning Province,the variation range was closely related to latitude and geographical location. As for the spatial changes,the beginning day of agricultural boundary temperature was postponed from southwest to northeast,and the en-ding day was postponed from northeast to southwest,accumulate temperature was descended from southwest to northeast.ConclusionIn the future,the planting trend in Liaoning Province should be based on the mountainous hilly region of western Liaoning,and it should be extended to the central plain areas and the lowland and hilly areas of eastern Liaoning. In the agricultural production process,chemical fertilizers and pesticides should be reasonably used to promote the sus-tainable development of the agricultural ecological environment.