A Comparison of the Field and Laboratory Methods of Measuring CO2 Emissions Released from Soil to the Atmosphere

Abstract

In the context of global climate changes the attention of the research is focused on the soil tillage technologies. Soil tillage significantly affects the amount of carbon dioxide (CO2) released from soil to the atmosphere. Research of the soil emissions is usually conducted in field conditions. The aim of this study is to increase efficiency of the research by substitution of the field method by laboratory method of measuring CO2 emissions released from soil. The INNOVA measuring devices equipped with the photoacoustic infrared detection sensor was used. The field method measurement is conducted directly in the field conditions. The laboratory method consists of collecting soil samples from the field by sampling probes and their subsequent analysis in laboratory. Soil conditions where the soil samples were taken: haplic luvisol with slightly alkaline soil reaction and medium content of humus. Measurements were conducted nine days after soil tillage by power harrow PÖTTINGER LION 301. Means of the measured values of CO2 emissions released from soil ranged from 455.580 ppm to 459.392 ppm. There were not found a statistically significant difference between field and laboratory method at 99.9% confidence level. The CO2 emissions in the surrounding air were significantly lower, mean 403.125 ppm. It means that it is possible to use soil sampling laboratory method to measure CO2 emissions released from soil to the atmosphere. Used laboratory method allows to measure CO2 emissions released from soil at the same time in 12 points and creates the possibility for long-term complex monitoring.

U kontekstu globalnih kljimatskih promena, težište istraživanja je stavljeno na tehnologije obrade zemljišta. Obrada zemljišta značajno utiče na količinu ugljen-dioksida (CO2) oslobođenog iz zemljišta u atmosveru. Istraživanje emisija iz zemljišta obično se izvodi u poljskim uslovima. Cilj ove studije je da unapredi efikasnost istraživanja zamenom poljskih metoda laboratorijskim metodama merenja emisija CO2 oslobođenog iz zemljišta. Korišćeni su merni uređaji INNOVA, opremljeni senzorima za fotoakustičnu i infracrvenu detekciju. Merenje poljskim metodom izvođeno je direktno u poljskim uslovima. Laboratorijski metod sastoji se od sakupljanja zemljišnih uslova sa terena i njihova naknadna analiza u laboratoriji. Zemljišni uslovi na mestima uzorkovanja zemljišta: ilovasti černozem blago bazne reakcije sa srednjim sadržajem humusa. Merenja su sprovedena devet dana posle obrade mašinom PÖTTINGER LION 301. Srednje vrednosti izmerenih emisija CO2 oslobođenog iz zemljišta iznosile su od 455.580 ppm do 459.392 ppm. Nije utvrđena statistički značajna razlika između poljskog i laboratorijskog metoda na nivou tačnosti 99.9%. Emisije CO2 u okolni vazduh bile su značajno manje, sa srednjom vrednošću od 403.125 ppm. To znači da je moguće primeniti laboratorijski metod na uzorcima zemljišta za merenje emisija CO2 oslobođenog iz zemljišta u atmosveru. Primenjeni laboratorijski metod dozvoljava merenje emisija CO2 oslobođenog iz zemljišta istovremeno u 12 tačaka i omogućuje dugotrajno kompleksno praćenje.