Data from: Flow of CO2 from soil may not correspond with CO2 concentration in soil

Frouz, Jan, Charles University

Bujalský, Luděk, Charles University

Published Jun 26, 2019 on Dryad. https://doi.org/10.5061/dryad.41sk145

Cite this dataset

Frouz, Jan; Bujalský, Luděk (2019). Data from: Flow of CO2 from soil may not correspond with CO2 concentration in soil [Dataset]. Dryad. https://doi.org/10.5061/dryad.41sk145

Abstract

The relationship between CO2 flow from soil and soil CO2 concentration was investigated at 72 permanent sampling points at two forested post-mining sites in the northwest of the Czechia. Based on the entire data set (72 points sampled monthly during the growing season), CO2 flow from the soil was positively correlated with soil CO2 concentration. CO2 concentration in deeper soil layers was positively correlated with root biomass and negatively correlated with soil microbial respiration. In individual sampling points relationship between CO2 flow and soil CO2 concentration varied from being significantly positive (30% of points) to significantly negative (7%) but mostly being non-significant (63%). The positive correlation occurred at points with high root biomass in deeper soil layers, while the negative correlation occurred at points with high soil microbial respiration per cm3 of soil. Laboratory experiments showed that the CO2 produced by microbial respiration can reduce microbial respiration but that CO2 produced by root respiration did not reduce root respiration. The results indicate that when soil ventilation is poor, microbial respiration can sufficiently increase soil CO2 concentration so as to reduce microbial respiration, which greatly increases the variability in the relationship between CO2 flow from soil and soil CO2 concentration.

Usage notes

field_data_flow_concentration

Table describes values of soil CO2 concentration measured at two depth (0-5 cm and 5-20cm) and value of CO2 flow from the soil measured the same spot, in addition, there is soil temperature measured at this spot in the same time. These data are accompanied by set soil physical and biological characteristics, which was measured for each spot at the end of measurement. See fig 1 for scheme of the measurement. The data in the table serve as basis for fig. 3 and 4.

labrsp_soil

Table describes respiration of soil in laboratory incubation experiments when respiration was measured by incubation of samples in hermetically closed bottle where CO2 was trapped in NaOH. There were two variant of NaOH addition in one he NaOH was added at the beginning of cultivation in second at the end of cultivation. There were two bottle for soil from each spot so this is a pair data. See Fig 2 in the paper for scheme of experiment. Date were basis for Fig 5.

lab_spruce

Table describes respiration of spruce seedling roots in laboratory incubation experiments when respiration was measured by incubation of samples in hermetically closed bottle where CO2 was trapped in NaOH. There were two variant of NaOH addition in one he NaOH was added at the beginning of cultivation in second at the end of cultivation. There were two comparable groups of seedlings so this is not a pair data. See Fig 2 in the paper for scheme of experiment.

Location

České Budějovice 7

Europe