Method for determining evapotranspiration rate of referential crops

A technology for evapotranspiration and crops, applied in the field of agricultural scientific research, can solve the problem of inability to take into account the simplicity of calculation and accurate results, and achieve the effect of simple calculation and accurate calculation results.

Inactive Publication Date: 2009-04-29
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

[0015] The purpose of the present invention is to overcome the problems in the prior art that cannot balance the simplicity of calculation and the accuracy o

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  • Method for determining evapotranspiration rate of referential crops
  • Method for determining evapotranspiration rate of referential crops
  • Method for determining evapotranspiration rate of referential crops

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Embodiment Construction

[0040] The present invention will be described in more detail below through specific examples.

[0041] The process of obtaining the K value map in this embodiment is relatively complicated, and generally speaking, it includes three steps: one, calculate the K value of the site according to the climatological data of 811 meteorological stations in mainland China; two, perform spatial interpolation, based on the 811 stations The K value of the spatially continuous distribution of the K value, that is, the K value map; third, obtain the K value of the location where the reference crop water demand needs to be estimated, as well as the average maximum temperature and the average minimum temperature within the time period for which the reference crop water demand needs to be estimated.

[0042] The first step is the foundation, and the workload is the largest. The present embodiment calculates the pET of different stations, different years, and different climates for the climatolo...

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Abstract

The invention discloses a method for determining the evapotranspiration of a reference crop, which belongs to the field of agricultural scientific research. The method comprises the following steps: calculating the evapotranspirations pET0 and hET0 of 72 pentads each year of m meteorological sites in n years; calculating the ratio of pET0 to hET0; and then calculating the average value Ks of the ratio based on the pentads and the average value Ksj of the ratio based on years in each pentad; obtaining the Ks and the Ksj at any position in a target area through a spatial interpolation method; calculating the hET0 aiming at a target location in the target area; and calculating the evapotranspiration of the reference crop at the target location based on that ET0 is equal to K * hET0, wherein K is equal to Ks or Ksj. The method needs fewer basic meteorological data, and only needs the average maximum and minimum temperatures in a period of time to be measured; besides, the method is simple and convenient for calculation, is easy to master, and does not lose accuracy at the same time, is suitable to calculate the reference crop evapotranspiration at any place and in any time period in the range of the main land.

Description

technical field [0001] The invention relates to a method for determining reference crop evapotranspiration, in particular to a method for accurately calculating reference crop evapotranspiration in an area only by limited meteorological data. It belongs to the field of agricultural science research. Background technique [0002] The terrestrial water cycle composed of rainfall, water surface evaporation, soil evaporation, plant transpiration and other processes is the basic element for maintaining terrestrial ecosystems. Among them, soil evaporation and plant transpiration are collectively called evapotranspiration (ET), and crop evapotranspiration is the formula for crop irrigation. The basic basis of the system and regional irrigation water demand planning must be considered in many fields such as regional water balance, farmland irrigation, and water resource management. However, in the process of measuring crop evapotranspiration, there are often many influencing factor...

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Application Information

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IPC IPC(8): G01N33/24G01V9/02A01G7/00
Inventor 龙怀玉段淑辉张认连雷秋良
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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