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Greenhouse crop canopy saturated water vapor pressure difference calculation method under sunny day condition

A technology of crop canopy and water vapor pressure difference, which is applied in complex mathematical operations, design optimization/simulation, climate sustainability, etc. It can solve the problems of complex measurement, error-prone, and many parameters, and achieve low measurement cost and high measurement efficiency. Small result error, simple and scientific measurement method

Active Publication Date: 2020-07-28
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0003] Aiming at the defects and problems of many parameters, complicated measurement and error-prone in the current calculation method of canopy saturated water vapor pressure difference, the present invention provides a greenhouse crop under sunny conditions Calculation Method of Canopy Saturated Water Vapor Pressure Difference

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  • Greenhouse crop canopy saturated water vapor pressure difference calculation method under sunny day condition
  • Greenhouse crop canopy saturated water vapor pressure difference calculation method under sunny day condition
  • Greenhouse crop canopy saturated water vapor pressure difference calculation method under sunny day condition

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Embodiment 1

[0026] Embodiment 1: This embodiment provides a calculation method for the saturated water vapor pressure difference of the greenhouse crop canopy under sunny conditions, and the method includes the following steps:

[0027] Step 1. Use the plant growth monitor to collect the greenhouse environmental parameters and canopy solar radiation in the solar greenhouse at different time points from 0:00 to 12:00 and 12:30 to 23:30, and monitor the growth of crops in real time conditions, the collection time is 7:00, 10:00, 12:00, 15:00 and 18:00 every day, and the canopy saturated water vapor pressure difference at different time points in the two periods is calculated;

[0028] Step 2. Simulate the relationship between the indoor canopy solar radiation and the saturated water vapor pressure deficit in the two periods of 0:00-12:00 and 12:30-23:30 respectively to obtain the saturated water vapor pressure deficit and Regression model for indoor canopy solar radiation:

[0029] From 0:...

Embodiment 2

[0034] Embodiment 2: This embodiment provides a calculation method for the saturated water vapor pressure difference of the greenhouse crop canopy under sunny conditions. in the greenhouse. The geographical location of this area is 114.52° east longitude and 30.23° north latitude. It is a monsoon climate zone, with northerly wind prevailing in winter and southerly wind prevailing in summer. Uneven distribution, less rainfall in summer and autumn.

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Abstract

The invention belongs to the field of canopy saturated water vapor pressure difference calculation, and particularly relates to a greenhouse crop canopy saturated water vapor pressure difference calculation method. The method comprises the following steps: measuring air temperature, humidity and total radiation at a crop canopy height (2.0 m) in a greenhouse; calculating and obtaining the water vapor pressure depletion (VPD) of the canopy in the greenhouse; carrying out numerical simulation on the VPD by adopting a piecewise analysis method; obtaing the fitting function of saturated water vapor pressure depletion and indoor canopy solar radiation in two time periods of 0: 00-12: 00 and 12: 30-23: 30. A new method is provided for calculation of greenhouse crop canopy water vapor pressure difference, and the method has guiding significance for research on microclimate change characteristics and microclimate simulation of the sunlight greenhouse.

Description

technical field [0001] The invention belongs to the technical field of canopy saturated water vapor pressure difference, and in particular relates to a calculation method for greenhouse crop canopy saturated water vapor pressure difference. Background technique [0002] Vapor Pressure is the partial pressure of water vapor in atmospheric pressure, and the moisture content in the air is directly related to the water vapor pressure. The partial pressure at which water vapor in the air reaches saturation at a certain temperature is called the saturated water vapor pressure e 0 (T). The higher the temperature, the greater the ability of the air to store moisture, and the greater the saturated water vapor pressure. Actual water vapor pressure e a is the partial pressure of water vapor in the actual atmospheric pressure. When the air is not saturated, the actual water vapor pressure e a Specific saturation water vapor pressure e 0 (T) small. The difference between the satur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06F30/20G06F111/10
CPCG06F17/18Y02A90/10
Inventor 葛建坤
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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