Day-scale primary productivity estimation method based on instantaneous photosynthetic rate integration

A primary productivity and photosynthetic rate technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of not taking into account the diurnal variation characteristics of meteorological elements, limiting global carbon, and overestimating or underestimating primary productivity.

Inactive Publication Date: 2013-04-03
ZHEJIANG UNIV
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Problems solved by technology

In the current research on the conversion from "instantaneous" to "day" scale, either the diurnal variation characteristics of meteorological elements are not considered, or the mechanism model of the relationship between photosynthetic rat...

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  • Day-scale primary productivity estimation method based on instantaneous photosynthetic rate integration
  • Day-scale primary productivity estimation method based on instantaneous photosynthetic rate integration
  • Day-scale primary productivity estimation method based on instantaneous photosynthetic rate integration

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] refer to Figure 1~Figure 3 , a method for estimating primary productivity on a "day" scale based on instantaneous photosynthesis rate integration, the measurement method comprising the following steps:

[0048]1) Instantaneous photosynthetic rate calculation: By coupling the Farquhar model, the model of the relationship between CO2 intercellular concentration and photosynthetic rate, and Ball-Berry models, the cubic equation of photosynthetic rate is obtained, and the instantaneous photosynthetic rate is obtained by solving the equation;

[0049] 2) Instantaneous meteorological data model based on daily average meteorological data: use the law of daily variation of meteorological data, and use sine function to simulate the daily variation characteristics of temperature and radiation data.

[0050] 3) "Day" scale primary productivity calculation: Substituting t...

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Abstract

The invention relates to a day-scale primary productivity estimation method based on instantaneous photosynthetic rate integration, and the method comprises the following steps of (1) calculation of instantaneous photosynthetic rate: establishing a cubic equation through a relationship formula among the coupled instantaneous photosynthetic rate, intercellular carbon dioxide (CO2) concentration and stomatal conductance, and calculating the instantaneous photosynthetic rate; (2) simulation of instantaneous weather data: simulating the instantaneous weather by utilizing a sinusoidal function through the characteristic that the temperature and radiation diurnal variation follows the sinusoidal variation principle; and (3) calculation of day-scale primary productivity integration: substituting the instantaneous photosynthetic rate solved in the step (1) in the simulated weather data to form a function adopting the time as a variable, utilizing a trapezoid or simpson formula to integrate the time, and acquiring the day-scale primary productivity. By utilizing the diurnal variation principle characteristics of the weather data and combining the instantaneous photosynthetic rate calculation formula, the measurement precision is high.

Description

technical field [0001] The invention relates to the large field of global carbon cycle parameter measurement and the small field of primary productivity time scale conversion, in particular to a "day" scale primary productivity estimation method based on instantaneous photosynthetic rate numerical integration. Background technique [0002] Primary productivity is a key factor in the carbon balance of terrestrial ecosystems, and it is also the initial source of ecosystem carbon flux. Ecosystem carbon flux is characterized by different time scales, including "instantaneous", "hour", "day", "month" and "year". Although most of the mechanism models are established on the instantaneous scale, since most of the meteorological data are "day" scale data, the "day" scale primary productivity estimation data based on meteorological data is the most widely used in ordinary research. , so it is necessary to establish the conversion of primary productivity from the "instantaneous" scale...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王福民周斌黄敬峰徐俊锋
Owner ZHEJIANG UNIV
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