A Method for Calculating Winter Wheat Crop Coefficient Based on Air Temperature Distribution and Surface Heat
A technology of winter wheat and distribution function, which is applied in the field of calculating winter wheat crop coefficient based on air temperature distribution and surface heat, can solve the problems that the limit temperature of winter wheat growth area cannot be obtained by non-experimental methods, and soil heat is not considered.
Active Publication Date: 2022-01-28
NANJING HYDRAULIC RES INST
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is that the limit temperature of the winter wheat growth area cannot be obtained by non-experimental methods in the prior art, and the influence of soil heat on the growth of winter wheat is not considered, but a method for calculating the winter wheat crop coefficient using the heat information of the winter wheat growth area is provided
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[0041] The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples: the following examples are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0042] An embodiment of the present invention provides a method for calculating the winter wheat crop coefficient based on air temperature distribution and surface heat. The present invention utilizes a large-scale weighing type lysimeter to implement the experiment on the crop coefficient of winter wheat, and the buried depth of groundwater in the lysimeter is set at 0.5, 1.0, 2.0 and 3.0m. The 0.5m and 2.0m groundwater depth tests were carried out in the 2018 / 11 growing season, and the 1.0m and 3.0m groundwater depth tests were carried out in the 2019 / 11 growing season. The test site is located in the Wudaogou Hydrology and Water Resources Experimental Station in the Huaibei Plai...
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The invention discloses a method for calculating winter wheat crop coefficient based on air temperature distribution and surface heat, including fitting the distribution function of air temperature in each growth stage, setting n probability values, and obtaining n 2 A combined scenario of upper limit temperature and lower limit temperature; correct the invalid temperature under the combination scenario of upper limit temperature and lower limit temperature, and correct the crop coefficient according to the heat stress of the atmosphere and soil on wheat; estimate the optimal solution of the parameters in the correction formula under different limit temperature scenarios ; Compare the crop coefficient of winter wheat under the optimal solution correction with the actual crop coefficient. The present invention simulates the crop coefficient of wheat through the combination of regional atmospheric and soil heat, and the examples prove that the method can comprehensively reflect the influence of dual-source heat on the wheat crop coefficient, and is suitable for simulating the crop coefficient of wheat under different heat scenarios. Constructing a robust wheat crop coefficient model has considerable practical application value.
Description
technical field [0001] The invention relates to the field of crop coefficient calculation methods, in particular to a method for calculating winter wheat crop coefficients based on air temperature distribution and surface heat. Background technique [0002] Due to the low rainfall during the winter wheat growth period (November-June of the following year), accurate estimation of wheat evapotranspiration is very important for formulating scientific irrigation plans and ensuring wheat yield. The crop coefficient is a key parameter for calculating crop evapotranspiration. [0003] Through the physiological responses of winter wheat to meteorological elements, heat is considered to be the key to affect the growth of winter wheat. In the prior art, the crop coefficient of winter wheat is obtained by simulating the effective temperature. In this method, the limit temperature is the key to screening the effective temperature. At present, due to the lack of a method to determine the...
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IPC IPC(8): G06F30/20G06F111/10
CPCG06F30/20G06F2111/10
Inventor 顾南王国庆张建云刘翠善王振龙
Owner NANJING HYDRAULIC RES INST