Improvement of operational method for controlof CO2 emission from the soil surface

Abstract

Today, there is a high availability of various systems to assess the CO2 emissions from the soil surface by means of
(single and multichannel) infrared analyzers. In connection with large expenditures of labor and imperfect field’s
methods for measuring emissions of CO2 from soil it was the task to investigate promising, from our point of view,
instrumental method of monitoring carbon dioxide emissions from soil using a portable gas analyzer
testo535.Portable gas analyzer testo 535 - is a precision instrument for measuring CO2 in the air and work area in an
isolated area. Areas of observation for research CO2 emissions under different crops using a portable gas analyzer
testo 535 were laid on Experimental Field "Korotychanske" State Enterprise of National Scientific Center «Institute for
Soil Science and Agrochemistry Research named after O.N. Sokolovsky» (now Grakivske) in April 2012. Soil
experimental fields – podzolized chernozem low humus heavy loam on loess like loam. In order to achieve better
reproducibility of the results it was carried out experimental study of several problematic issues: defining optimal
exposure experiment and establishment of optimal stereometry indicators for respiration’s camera. The experimental
results show that to improve the accuracy and objectivity of measurements we should choose a 15-minute exposure,
the working chamber with an average volume of 2,3 dm
3 absorption of infrared vertical fixing probe at a distance from
the ground 1,5-2 cm. According to the research of the method of measurement, this was later tested at pilot sites and
soil monitoring network in Kharkiv region. During 2012 – 2014 years on stationary experience it was conducted
periodic research monitoring the dynamics of intensity of respiration using a portable instrument testo 535.
Observations on the dynamics of soil CO2 emissions showed that plant crops almost a third defines the total
variability in CO2 concentration in the layer of air above the soil, primarily due to the contribution of root respiration.