怀远县气候态的转变特征及农业生产的响应OA

Based on the temperature,precipitation and sunshine duration data from 1981 to 2020 at the National Basic Meteorological Station in Huaiyuan County,Anhui Province,this study adopted the linear trend analysis method to explore the differences in climate change between 2 climatic state(P1:1981-2010;P2:1991-2020)and their impacts on agricultural production.The results showed that,in terms of temperature,the annual average temperature in P2 increased by 0.3℃compared with P1.Spring presented a climatic tendency rate of 0.42℃/10 a,which was the dominant season contributing to regional warming.In terms of precipitation,the annual average precipitation in P2 was 955.6 mm,an increase of 18.6 mm relative to P1,while the annual average rainy days were 101.8 days with little difference between the two periods.Precipitation increased obviously in spring and summer,with an increment of 6.5 mm and 8.6 mm,respectively.For sunshine duration,the annual sunshine hours decreased significantly in P2 compared with P1.Sunshine duration declined in summer,autumn and winter,among which autumn had the most obvious reduction of-15.1 h,whereas spring sunshine hours increased by 8.5 h.The analysis on agricultural impacts indicated that rising temperature,dramatic precipitation fluctuation and reduced sunshine duration advanced the whole growth period of winter wheat and delayed the growth period of single-cropping rice.Climate warming also reduced soil fertility,facilitated weed propagation and pest larva overwintering,and further raised agricultural production costs.Therefore,targeted measures should be formulated according to local agricultural development conditions to establish a climate-adaptive agricultural technology system and promote the sustainable development of agriculture in the future.