[Objective]The research aimed to study the influence of climatic variation on rice production in Anqing zone.[Method]Based on temperature and precipitation data in rice growth period(May-November)during 1980-2009,by u...[Objective]The research aimed to study the influence of climatic variation on rice production in Anqing zone.[Method]Based on temperature and precipitation data in rice growth period(May-November)during 1980-2009,by using five-year sliding average method,the moving average charts of temperature and rainfall were made.The variation characteristics of main factors(temperature and precipitation)which affected rice growth were analyzed.By using line moving average simulation method,the climatic yield was separated,and the influence of climatic factor on rice yield in Anqing zone was analyzed.[Result]In recent 30 years,the temperature presented rise trend in rice growth period in Anqing zone.Started from 1993,the rise was obvious.But the rainfall had decline trend,and the rainfall was stable after 2000.These were the climatic background for that rice yield had a wave of quick increase after 2000.Seen from the separated results of trend yield and meteorological yield,the variation range of relative meteorological yield was big,and the maximum yield reduction reached 27.5%.In recent 30 years,there were four yield reduction years.The relationship between meteorological yield of rice and temperature was positive correlation except in September.The excessive rainfall in the rice harvest period had unfavorable influence on rice yield.The drought was the main meteorological agricultural disaster which affected rice yield in the zone.[Conclusion]The research provided the theoretical basis for improving grain yield in Anqing zone.展开更多
[Objective]The research aimed to study the variability and variation characteristics of climate in northern winter wheat zone during 1961-2004.[Method]Based on the meteorological data(temperature,precipitation and sun...[Objective]The research aimed to study the variability and variation characteristics of climate in northern winter wheat zone during 1961-2004.[Method]Based on the meteorological data(temperature,precipitation and sunshine)of 55 meteorological stations in northern winter wheat zone during 1961-2004 and the yield data of winter wheat,by using the linear regression,correlated coefficient and climatic tendency rate,the spatial and temporal evolution characteristics of agricultural climatic resources(sunshine hours,temperature and precipitation)in northern winter wheat zone were analyzed.[Result]The annual average temperature,precipitation and sunshine hours in northern winter wheat zone during 1961-2004 all presented certain zonal distribution in the space.The precipitation and temperature gradually decreased from south to north.The sunshine hours gradually increased from south to north.The annual average temperature overall presented rise trend in northern winter wheat zone in 44 years,but the rise rate had difference in the different areas.The rise of annual average temperature in the high-latitude zone was more obvious than that in the low-latitude zone.The annual rainfall overall presented decrease trend,and the tendency rate of annual precipitation had significant difference in the different areas.The decrease rates of rainfalls in the central and western areas were bigger than that in other areas.The annual sunshine hours overall presented decline trend.In most areas,the tendency rate of annual sunshine hours was negative.But there was certain difference in the different areas.The zones where the decrease amplitude was smaller scattered in the west,and included central Shaanxi,south of Shanxi and some areas in southeast of Shandong.The decrease amplitudes were bigger in south of Henan,northwest of Shandong and south of Hebei.[Conclusion]The research provided theoretical basis for understanding the historical evolution of climate in northern winter wheat zone.展开更多
文摘[Objective]The research aimed to study the influence of climatic variation on rice production in Anqing zone.[Method]Based on temperature and precipitation data in rice growth period(May-November)during 1980-2009,by using five-year sliding average method,the moving average charts of temperature and rainfall were made.The variation characteristics of main factors(temperature and precipitation)which affected rice growth were analyzed.By using line moving average simulation method,the climatic yield was separated,and the influence of climatic factor on rice yield in Anqing zone was analyzed.[Result]In recent 30 years,the temperature presented rise trend in rice growth period in Anqing zone.Started from 1993,the rise was obvious.But the rainfall had decline trend,and the rainfall was stable after 2000.These were the climatic background for that rice yield had a wave of quick increase after 2000.Seen from the separated results of trend yield and meteorological yield,the variation range of relative meteorological yield was big,and the maximum yield reduction reached 27.5%.In recent 30 years,there were four yield reduction years.The relationship between meteorological yield of rice and temperature was positive correlation except in September.The excessive rainfall in the rice harvest period had unfavorable influence on rice yield.The drought was the main meteorological agricultural disaster which affected rice yield in the zone.[Conclusion]The research provided the theoretical basis for improving grain yield in Anqing zone.
基金Supported by Special Item of Public Welfare Industry Science Research(GYHY201006025)
文摘[Objective]The research aimed to study the variability and variation characteristics of climate in northern winter wheat zone during 1961-2004.[Method]Based on the meteorological data(temperature,precipitation and sunshine)of 55 meteorological stations in northern winter wheat zone during 1961-2004 and the yield data of winter wheat,by using the linear regression,correlated coefficient and climatic tendency rate,the spatial and temporal evolution characteristics of agricultural climatic resources(sunshine hours,temperature and precipitation)in northern winter wheat zone were analyzed.[Result]The annual average temperature,precipitation and sunshine hours in northern winter wheat zone during 1961-2004 all presented certain zonal distribution in the space.The precipitation and temperature gradually decreased from south to north.The sunshine hours gradually increased from south to north.The annual average temperature overall presented rise trend in northern winter wheat zone in 44 years,but the rise rate had difference in the different areas.The rise of annual average temperature in the high-latitude zone was more obvious than that in the low-latitude zone.The annual rainfall overall presented decrease trend,and the tendency rate of annual precipitation had significant difference in the different areas.The decrease rates of rainfalls in the central and western areas were bigger than that in other areas.The annual sunshine hours overall presented decline trend.In most areas,the tendency rate of annual sunshine hours was negative.But there was certain difference in the different areas.The zones where the decrease amplitude was smaller scattered in the west,and included central Shaanxi,south of Shanxi and some areas in southeast of Shandong.The decrease amplitudes were bigger in south of Henan,northwest of Shandong and south of Hebei.[Conclusion]The research provided theoretical basis for understanding the historical evolution of climate in northern winter wheat zone.
