Day scale primary productivity estimation method based on photoresponse segmentation characteristics

Abstract

Disclosed is a day scale primary productivity estimation method based on photoresponse segmentation characteristics. The method includes that (1) a primary productivity in a time period from sunrise to noon is calculated, then the primary productivity is multiplied by 2 to obtain a 'daytime' primary productivity, the primary productivity in the time period from sunrise to noon is divided into two sections, and time lengths corresponding to a first section of middle time t1 and a second section of middle time t2 are Dt1 and Dt2 respectively; (2) instantaneous temperature and radiation which are in daytime and correspond to the t1 and t2 are calculated by an air temperature and radiation diurnal variation formula; (3) an instantaneous photosynthetic rate which the t1 and the t2 correspond to is calculated by a photosynthetic rate model; and (4) the instantaneous photosynthetic rate is combined with the time lengths and a segmentation method is utilized to convert the instantaneous photosynthetic rate to the 'daytime' primary productivity. According to the day scale primary productivity estimation method based on the photoresponse segmentation characteristics, the time scale transformation from 'instant' to 'day' is performed, the 'day' scale primary productivity can be accurately estimated, and the calculating efficiency is greatly improved.

Description

technical field [0001] The invention relates to the large field of global carbon cycle calculation and the research direction of primary productivity space-time scale conversion, in particular to a day-scale primary productivity estimation method based on light response segmentation features. Background technique [0002] Primary Productivity The photosynthetic capacity of the earth's vegetation is a key factor for the carbon balance of terrestrial ecosystems. Photosynthesis occurs on the "instantaneous" scale. However, when people conduct long-term carbon cycle dynamic analysis, they generally need to use "daily" or "monthly" data as the basis, especially "daily" scale data, which is fast and accurate. The efficient conversion of photosynthesis on the "instantaneous" scale to primary productivity on the "daily" scale is of great significance for the study of carbon dynamics in large regions. In the current research on the scale conversion from "instantaneous" to "day", eit...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low calculation accuracy or low calculation efficiency of existing "instantaneous" to "daily" scale primary productivity calculations, the present invention provides a day-scale primary productivity estimation method based on light response segmentation features, Using the segmental characteristics of photosynthetic rate to light response, the time scale conversion of primary productivity from "instantaneous" to "day" is performed, with high accuracy and high calculation efficiency

Images