In order to explore the law of photosynthetic active radiation in winter sunlight greenhouse in Panjin and serve the local facility agriculture better,based on the observed data of sunlight greenhouse microclimate and...In order to explore the law of photosynthetic active radiation in winter sunlight greenhouse in Panjin and serve the local facility agriculture better,based on the observed data of sunlight greenhouse microclimate and of the nearby weather station during winter in 2012,the methods of correlation analysis and stepwise regression analysis were adopted to study characteristics of photosynthetic active radiation in sunlight greenhouse and the ratio of photosynthetic active radiation to global radiation under different weather types during winter,and to set up forecast models of photosynthetic active radiation in sunlight greenhouse under different weather types during winter.The results showed that：（1） the daily variation of photosynthetic active radiation in sunlight greenhouse on sunny and cloudy days were both obvious,and photosynthetic active radiation in sunlight greenhouse was 1-38 W/m^2 when it＇s cloudy.（2） ηPARon typical cloudy day was the highest,on cloudy day was secondary and on sunny day was the minimum during winter;（3） the methods of stepwise regression analysis were respectively adopted to set up models of the highest daily maximum photosynthetic active radiation,the total daily photosynthetic active radiation,daily maximum global radiation,and the total daily global radiation in sunlight greenhouse associated with climate outside,the models passed the 0.01 level of significance,and fitting test had been carried out：4 factors were fitted well on sunny and cloudy day,but fitted poor on overcast day.展开更多
Energy-saving solar greenhouse vegetables cultivating is to create and improve microclimate environment with greenhouse in those seasons impossible for open cultivation production and in order to achieve the purpose o...Energy-saving solar greenhouse vegetables cultivating is to create and improve microclimate environment with greenhouse in those seasons impossible for open cultivation production and in order to achieve the purpose of harvest in advance or in delay. Since a greenhouse needs huge construction expenses and high production costs, only though the improvement of facility utilization can we obtain better economic benefits. Vegetable germination and seedling stage need a long time for ground, so they need smaller standing area. So we concentrated in a small area of cultivation can not only create a suitable environment easily, nurture strong age seedling, but also can avoid greenhouse waste. Make transplanting to greenhouse after Seedlings breeding can effectively reduce the fertility cycle and substantially increase greenhouse utilization.展开更多
The relationships of nitrous oxide(N2O)and methane(CH4)emissions to other environmental parameters have been studied extensively in Antarctic terrestrial ecosystems.However,the effects of sunlight on soil N2O and CH4 ...The relationships of nitrous oxide(N2O)and methane(CH4)emissions to other environmental parameters have been studied extensively in Antarctic terrestrial ecosystems.However,the effects of sunlight on soil N2O and CH4 fluxes are neglected across the Antarctic tundra.Here,fluxes of N2O and CH4 from maritime Antarctic tundra soils were measured in the absence and presence of sunlight during three summers.The N2O fluxes averaged-4.6±1.2μg·m^-2·h^-1 in the absence of sunlight and 5.7±1.5μg·m^-2·h^-1 in its presence;CH4 fluxes averaged 119.8±24.5μg·m^-2·h^-1(absence)and-40.5±28.3μg·m^-2·h^-1(presence).The correlations between N2O and CH4 fluxes and other environmental variables(e.g.,soil moisture,temperature,organic and inorganic material)were not statistically significant(P>0.05)at all sites.On average,sunlight significantly increased N2O emissions and CH4 uptake by 10.3μg·m^-2·h^-1 and 160.3μg·m^-2·h^-1,respectively.This study indicates that sunlight is critical for accurately estimating N2O and CH4 budgets from maritime Antarctica and necessary for constraining the role of their emissions from tundra soil.展开更多
基金Supported by Special Program for Scientific Research in Public Service Industry"Studies on Professional Weather Report for Agricultural Production in Northeast China"(GYHY201206024)~~
文摘In order to explore the law of photosynthetic active radiation in winter sunlight greenhouse in Panjin and serve the local facility agriculture better,based on the observed data of sunlight greenhouse microclimate and of the nearby weather station during winter in 2012,the methods of correlation analysis and stepwise regression analysis were adopted to study characteristics of photosynthetic active radiation in sunlight greenhouse and the ratio of photosynthetic active radiation to global radiation under different weather types during winter,and to set up forecast models of photosynthetic active radiation in sunlight greenhouse under different weather types during winter.The results showed that：（1） the daily variation of photosynthetic active radiation in sunlight greenhouse on sunny and cloudy days were both obvious,and photosynthetic active radiation in sunlight greenhouse was 1-38 W/m^2 when it＇s cloudy.（2） ηPARon typical cloudy day was the highest,on cloudy day was secondary and on sunny day was the minimum during winter;（3） the methods of stepwise regression analysis were respectively adopted to set up models of the highest daily maximum photosynthetic active radiation,the total daily photosynthetic active radiation,daily maximum global radiation,and the total daily global radiation in sunlight greenhouse associated with climate outside,the models passed the 0.01 level of significance,and fitting test had been carried out：4 factors were fitted well on sunny and cloudy day,but fitted poor on overcast day.
文摘Energy-saving solar greenhouse vegetables cultivating is to create and improve microclimate environment with greenhouse in those seasons impossible for open cultivation production and in order to achieve the purpose of harvest in advance or in delay. Since a greenhouse needs huge construction expenses and high production costs, only though the improvement of facility utilization can we obtain better economic benefits. Vegetable germination and seedling stage need a long time for ground, so they need smaller standing area. So we concentrated in a small area of cultivation can not only create a suitable environment easily, nurture strong age seedling, but also can avoid greenhouse waste. Make transplanting to greenhouse after Seedlings breeding can effectively reduce the fertility cycle and substantially increase greenhouse utilization.
基金supported by the National Natural Science Foundation of China(Grant nos.41776190,41976220)。
文摘The relationships of nitrous oxide(N2O)and methane(CH4)emissions to other environmental parameters have been studied extensively in Antarctic terrestrial ecosystems.However,the effects of sunlight on soil N2O and CH4 fluxes are neglected across the Antarctic tundra.Here,fluxes of N2O and CH4 from maritime Antarctic tundra soils were measured in the absence and presence of sunlight during three summers.The N2O fluxes averaged-4.6±1.2μg·m^-2·h^-1 in the absence of sunlight and 5.7±1.5μg·m^-2·h^-1 in its presence;CH4 fluxes averaged 119.8±24.5μg·m^-2·h^-1(absence)and-40.5±28.3μg·m^-2·h^-1(presence).The correlations between N2O and CH4 fluxes and other environmental variables(e.g.,soil moisture,temperature,organic and inorganic material)were not statistically significant(P>0.05)at all sites.On average,sunlight significantly increased N2O emissions and CH4 uptake by 10.3μg·m^-2·h^-1 and 160.3μg·m^-2·h^-1,respectively.This study indicates that sunlight is critical for accurately estimating N2O and CH4 budgets from maritime Antarctica and necessary for constraining the role of their emissions from tundra soil.
