Soil CO2 Emission, Microbial Biomass, and Basal Respiration of Chernozems under Different Land Uses

• Published in: Eurasian soil science Vol. 52; no. 9; pp. 1091 - 1100
• Main Authors: Sushko, S. V., Ananyeva, N. D., Ivashchenko, K. V., Kudeyarov, V. N.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-09-2019; Springer Nature B.V
• Subjects: Biomass; Carbon dioxide; Carbon dioxide emissions; Chemical properties; Chemicophysical properties; Earth and Environmental Science; Earth Sciences; Ecosystems; Emission analysis; Emission measurements; Forests; Geotechnical Engineering & Applied Earth Sciences; Growing season; Land use; Microorganisms; Moisture content; Organic chemistry; Organic soils; Respiration; Seasons; Soil; Soil Biology; Soil chemistry; Soil properties; Soil surfaces; Soil temperature; Soil water; Soils; Steppes; Subsoils; Temperature; Water content; Chernozems; forest-steppe; microbial respiration; Technosols; substrate-induced respiration
• ISSN: 1064-2293; 1556-195X
• DOI: 10.1134/S1064229319090096

—
The relationships between the soil CO
2
emission and microbial properties have been studied in Haplic Chernozem of steppe, forest (oak), bare fallow of the reserve area and in Urbic Technosols of Kursk city. The CO
2
emission was monthly measured (May–October) from the soil surface (EM
surf
) and two subsoil layers at the depths of 10 and 20 cm (EM
10
, EM
20
), and the soil temperature and water content were simultaneously recorded. Overall, 360 soil samples have been taken from the layers 0–10, 10–20, and 20–30 cm for determining the microbial properties (microbial biomass carbon, C
mic
; basal respiration, BR). Soil chemical properties (the organic C content, total C, N, P, K, and Ca; and pH) have been measured in the samples taken in July. The EM
surf
of steppe averaged 24 g СО
2
/(m
2
day), which was 1.6, 1.5 and 6 times higher than that of forest, urban, and fallow soils, respectively. In the forest, EM
10
and EM
20
were two times higher than reference EM
surf
; they were similar in the fallow and urban soils; and they were by 34% lower in the steppe soil. The soil CO
2
emission of studied ecosystems depended weakly on soil temperature and water content during the growing season. The C
mic
and BR (0–10 cm) of undisturbed ecosystems (steppe, forest) were higher by, on average, 3–5 and 2–4 times, respectively, than those of disturbed (fallow, urban) ecosystems. The positive correlations between EM
surf
and C
mic
, BR (0–10 cm) were found (
r
= 0.56 and 0.74, respectively). The seasonal average EM
surf
for different land uses was controlled mainly (78%) by soil BR (linear regression). Therefore, the EM
surf
from Chernozems of different land uses during the growing season might be predicted on the basis of BR measurements (0–10 cm).