Canopy Temperature Change Rule And Its Affecting Factors Of The Winter Wheat In Beijing Daxing District

Water shortage has become the main factors of agricultural development in our country, it is impendent to carry out water-saving agriculture. Beijing daxing district is located in the semi-arid areas, the water resources is relatively shortage in the spring winter wheat irrigation. Canopy temperature can reflect the water status. Canopy temperature is one of the important indicator in irrigation decision So based on the irrigation of winter wheat canopy temperature control index of the experimental study in order to ensure real-time right amount of irrigation water is the basic way to reduce the waste of water resources and the development of sustainable agriculture.Field trials were conducted at the China institute of water resources and hydropower research daxing irrigation experimental station. Handheld infrared thermometer were used to monitor winter wheat canopy temperature. The LI-6400 photosynthetic apparatus were used to monitor the photosynthetic rate, transpiration rate and stomatal conductance. TRIME were used to monitor soil moisture. The temperature sensor were used to monitor soil temperature. The physiological and ecological indexes were measured by artificial. Automatic meteorological station were used to monitor meteorological factors. Analyzed the winter wheat canopy temperature change rule and its affecting factors under the condition of different irrigation. Main results are as follows:1. The canopy temperature of wheat in different water treatment is the most obvious difference in the filling stage. In the daytime, different water treatment of canopy temperature difference is more obvious under the different water treatment.2. The relationship between winter wheat canopy temperature and 0-100 cm soil water content is significant. The canopy temperature and 0-70 cm soil volumetric moisture content correlation is higher., it can be the basis of Monitoring the soil moisture content volume by canopy temperature.3. Winter wheat canopy temperature and solar radiation was significantly positive correlation in certain reproductive period. The relationship between canopy temperature and atmospheric temperature and is significant. Canopy temperature and relative humidity has significant negative correlation relationship.4. In heading- filling stage, the temperature difference is strongly influenced by transpiration rate. Photosynthetic rate change rule is contrary to canopy-air temperature.5. In jointing stage of winter wheat canopy temperature value can't be a good reflection of the crop leaf area index, the correlation between the two is not big, the canopy temperature of the water treatment and spike grain number basic show the opposite trend.6. Canopy temperature and the change trend of soil temperature and air temperature, canopy temperature influence on soil temperature is mainly manifested in the lower of the soil.Experimental results show that community: The change of the winter wheat canopy temperature and atmospheric temperature has a close relationship. Different water treatment of winter wheat canopy temperature and 0-70 cm soil volumetric water content relevance is good, it can be used to show the winter wheat water status in the body.