Relations On Microclimate And Climate Of Winter Wheat In Its Main Development Stages

Winter wheat is one of main grain crops of our country .It has different demand for meteorological factors according to different growth stage . To master farmland small-scale climate factor in different growth stages has important significance on scientific planting winter wheat . At present , the research of this domain mainly focus on qualitative research and the mutual relations of farmland temperature ,moisture and soil moisture . However, the research on related regular of farmland small-scale date and weather station data is seldom involved. This dissertation analyze the temperature of active layer , relative moisture of active layer and earth temperature in farmland of winter wheat in different growth stage and their according data of weather station, find out the regular by contrastion.The dissertation in documentary summary introduce the daily changeable character and reasons of farmland small-scale factors and field small-scale of factor firstly, explore the present conditions and developing trend of the research about quantitative relation and research of the relation of farmland small-scale climate and large-scale climate as well. The dissertation select WEN county 6, lankao 8, yu 34, yu 66, yunong9676, yu 64 and observe the temperature of active layer ,the moisture of cative layer and earth temperature of six kinds of winter wheat breeds and select six observing time: winter stage jointing stage ,booting stage, anthesis stage and grain-filling stage. And get the same time data of weather station. By contrast to thedata of farmland small-scale climate and the that of weather station , find there are evident relevance between small-scale climate data of field and according data of weather station and analyze the probable reasons causing to it.By analyzing, it can be concluded that winter stage is the early stage of winter wheat's development stage , and the character of field microclimate are not obvious, and the difference of microclimate and climate is also not obvious .During the jointing stage and booting stage , because the character of field microclimate are obvious, the difference of microclimate and climate is also obvious. The difference of microclimate and climate in anthesis stage and grain-filling stage of late development stage is situated in between them. The relative temperature of active layer in daytime generally below that of weather station and the difference is large, but at night the difference is much small. And as well as the earth temperature. Except whiter stage, the relative moisture of active layer in other four stages is generally above that of weather station in a whole day . It can be concluded that it has obvious relevance by analyzing the relation between the temperature of active layer, the relative moisture of active layer, earth temperature and that of weather station .