[Objective] The aim was to explore the change of illumination resources of protected agriculture in frost period to lay foundation for sustainable development of protected agriculture. [Method] The characters of illum...[Objective] The aim was to explore the change of illumination resources of protected agriculture in frost period to lay foundation for sustainable development of protected agriculture. [Method] The characters of illumination changes of protected agriculture in production period were analyzed based on climate tendency and stan- dard deviation in 1961-2010. [Resull] The production period of protected agriculture is from October to April of following year, when both of solar radiation and illumina- tion hour were declining and climate tendencies were -0.066 9 and -2.036 9 h/y. In 2001-2010, daily illumination hour reduced 0.49 h. Additionally, from December to February of the following year, total solar radiation and illumination hour were de- clining and the climate tendencies were -0.019 2 and -0.458 9 h/y. In general, the reduction of illumination resource significantly affects protected agriculture. Therefore, structure of greenhouse and management of cultivation should be improved to pro- mote protected agriculture. [Conclusion] The research provides references for pro- tected agriculture development in western part of Liaoning.展开更多
In order to resolve the frost-heave problem of highway foundation,firstly,the author discussed the law to frost heave of highway roadbed and gave an analysis on its influencing factors,such as soil,water and temperatu...In order to resolve the frost-heave problem of highway foundation,firstly,the author discussed the law to frost heave of highway roadbed and gave an analysis on its influencing factors,such as soil,water and temperature.Meanwhile,sand clay and silt are given a classification according to frost heave ratio.Secondly,the roadbed frozen damage shows to frost heave and froze boiling based on the frost heave law and its influencing factors.In addition,taking some highway as an example and some principle suggestion was given through the theory on providing frostbite methods for highway foundation frost heave in seasonal frozen area.Specially,an effective method,STYROFOAM extruded polystyrene foam was introduced.展开更多
基金Supported by Application and Promotion of Breeding, Introduction and Cultivation Technology of New Variety of Vegetable in Liaoning (2008209001)~~
文摘[Objective] The aim was to explore the change of illumination resources of protected agriculture in frost period to lay foundation for sustainable development of protected agriculture. [Method] The characters of illumination changes of protected agriculture in production period were analyzed based on climate tendency and stan- dard deviation in 1961-2010. [Resull] The production period of protected agriculture is from October to April of following year, when both of solar radiation and illumina- tion hour were declining and climate tendencies were -0.066 9 and -2.036 9 h/y. In 2001-2010, daily illumination hour reduced 0.49 h. Additionally, from December to February of the following year, total solar radiation and illumination hour were de- clining and the climate tendencies were -0.019 2 and -0.458 9 h/y. In general, the reduction of illumination resource significantly affects protected agriculture. Therefore, structure of greenhouse and management of cultivation should be improved to pro- mote protected agriculture. [Conclusion] The research provides references for pro- tected agriculture development in western part of Liaoning.
文摘In order to resolve the frost-heave problem of highway foundation,firstly,the author discussed the law to frost heave of highway roadbed and gave an analysis on its influencing factors,such as soil,water and temperature.Meanwhile,sand clay and silt are given a classification according to frost heave ratio.Secondly,the roadbed frozen damage shows to frost heave and froze boiling based on the frost heave law and its influencing factors.In addition,taking some highway as an example and some principle suggestion was given through the theory on providing frostbite methods for highway foundation frost heave in seasonal frozen area.Specially,an effective method,STYROFOAM extruded polystyrene foam was introduced.
