Forest ecological system respiration carbon flux determination method

Abstract

The invention provides a forest ecological system respiration carbon flux determination method, which comprises the following steps of obtaining the concentration of atmosphere CO2 at different heights in a target forest layer in the preset time period and the delta 13C isotope value in the atmosphere CO2; obtaining the forest ecological system respiration delta 13C isotope value according to the concentration of atmosphere CO2 and the delta 13C isotope value; obtaining the delta 13C isotope value in the CO2 generated by respiration of tree branches to be tested in the target forest in the preset time period and the delta 13C isotope value in the CO2 generated by respiration of soil; determining the proportion relationship of each respiration ingredient in the forest ecological system according to the obtained delta 13C isotope value in the CO2 generated by respiration of tree branches to be tested and the delta 13C isotope value in the CO2 generated by respiration of soil; obtaining the carbon flux of the soil to be tested; substituting the obtained carbon flux of the soil to be tested into the proportion relationship of each respiration in the forest ecological system; obtaining the forest ecological system respiration carbon flux. The carbon flux change of the atmosphere and the plants can be precisely measured in the forest ecological system under the complicated terrain conditions.

Description

technical field [0001] The invention relates to the technical field of forest ecosystem respiration measurement, in particular to a method for measuring forest ecosystem respiration carbon flux. Background technique [0002] The carbon cycle of forest ecosystem is very important in the global carbon cycle and plays an irreplaceable role in regulating atmospheric carbon dioxide. The annual carbon sequestration of forest ecosystems is about 2.4±0.4Pg, accounting for 90% of the carbon sequestration of terrestrial ecosystems (2.6±0.8Pg), even more than the carbon sequestration of global marine ecosystems (2.2±0.2Pg) . [0003] In the process of studying the global carbon cycle, due to the complexity and diversity of terrestrial ecosystems, it is difficult to accurately measure the carbon flux. Therefore, researchers usually treat the carbon sink of terrestrial ecosystems as the remainder of the global carbon balance equation. The forest is the most complex among all types of t...

AI Technical Summary

Problems solved by technology

However, eddy correlation technology also has restrictions on its implementation, which requires the atmospheric state of the measured area to be in a steady state, the underlying surface is uniform, and there is no carbon exchange between the underlying surface and the instrument.

However, in practical applications, the measured area is often not under ideal conditions, which also poses a problem for the application of eddy correlation technology.

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