Details
| Original language | English |
|---|---|
| Pages (from-to) | 311-325 |
| Number of pages | 15 |
| Journal | BIOGEOCHEMISTRY |
| Volume | 163 |
| Issue number | 3 |
| Early online date | 29 Mar 2023 |
| Publication status | Published - Apr 2023 |
Abstract
Antarctic King George Island is the fastest-warming area in the Southern Hemisphere. Organic matter inputs are scarce in this area, as they are derived from lichens, mosses, avian faeces, and minor inputs from two vascular plant species, Deschampsia antarctica É. Desv. and Colobanthus quitensis (Kunth) Bartl. Here, we examined the effects of freezing and thawing (FT) cycles on the priming effect (PE). We hypothesised that soil microorganisms preferentially use freeze-preserved soil organic carbon (SOC) exposed after thawing as an important energy source, resulting in intense PE. Two soils with contrasting clay contents were characterised by attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and incubated with and without 13C-glucose for 21 d. CO2 and 13CO2 were recorded from soil (i) without FT, (ii) one FT, and (iii) three FT cycles (− 18/12 °C). SOC exhibited low aromaticity stretching at 920 cm−1 and 1650 cm−1. Glucose-derived CO2 was maximal (26 ± 2.2 mg g−1 C) in the control soil without FT and decreased to 8.6 ± 0.1 mg g−1 C after three cycles. Glucose induced an intensely positive PE, 41–64% of basal respiration for a single FT cycle and 72–76% for no cycles. However, after three FT cycles, there was null or negative PE (− 9.5–0.4%). On average, the SOC content after net C balance increased with freezing frequency from 103 ± 14 to 212 ± 7. mg C kg−1 in low clay forming soil and from 129 ± 14 to 156 ± 2 mg C kg−1 in high clay forming soil and declined with increasing PE in both soils (R2 = 0.87, p < 0.01). Diminution in freezing frequency because of global warming will increase the positive PE, affecting the C sequestration of incipient SOC formation in maritime Antarctic soils. Graphic abstract: [Figure not available: see fulltext.]
Keywords
- Antarctic soils, Carbon isotope applications, Extreme environment, Initial soil development, Organic matter balance, Priming effect
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Chemistry
- Environmental Science(all)
- Water Science and Technology
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: BIOGEOCHEMISTRY, Vol. 163, No. 3, 04.2023, p. 311-325.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Freezing–thawing cycles affect organic matter decomposition in periglacial maritime Antarctic soils
AU - Matus, Francisco
AU - Mendoza, Daniela
AU - Nájera, Francisco
AU - Merino, Carolina
AU - Kuzyakov, Yakov
AU - Wilhelm, Kelly
AU - Boy, Jens
AU - Aburto, Felipe
AU - Jofré, Ignacio
AU - Dippold, Michaela A.
N1 - Funding Information: The authors sincerely appreciate the logistic support from INACH project RT_17_23 and MEC 80180029 (ANID-Chile). The authors are also grateful to the RUDN University Strategic Academic Leadership Program and the Universidad de La Frontera.
PY - 2023/4
Y1 - 2023/4
N2 - Antarctic King George Island is the fastest-warming area in the Southern Hemisphere. Organic matter inputs are scarce in this area, as they are derived from lichens, mosses, avian faeces, and minor inputs from two vascular plant species, Deschampsia antarctica É. Desv. and Colobanthus quitensis (Kunth) Bartl. Here, we examined the effects of freezing and thawing (FT) cycles on the priming effect (PE). We hypothesised that soil microorganisms preferentially use freeze-preserved soil organic carbon (SOC) exposed after thawing as an important energy source, resulting in intense PE. Two soils with contrasting clay contents were characterised by attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and incubated with and without 13C-glucose for 21 d. CO2 and 13CO2 were recorded from soil (i) without FT, (ii) one FT, and (iii) three FT cycles (− 18/12 °C). SOC exhibited low aromaticity stretching at 920 cm−1 and 1650 cm−1. Glucose-derived CO2 was maximal (26 ± 2.2 mg g−1 C) in the control soil without FT and decreased to 8.6 ± 0.1 mg g−1 C after three cycles. Glucose induced an intensely positive PE, 41–64% of basal respiration for a single FT cycle and 72–76% for no cycles. However, after three FT cycles, there was null or negative PE (− 9.5–0.4%). On average, the SOC content after net C balance increased with freezing frequency from 103 ± 14 to 212 ± 7. mg C kg−1 in low clay forming soil and from 129 ± 14 to 156 ± 2 mg C kg−1 in high clay forming soil and declined with increasing PE in both soils (R2 = 0.87, p < 0.01). Diminution in freezing frequency because of global warming will increase the positive PE, affecting the C sequestration of incipient SOC formation in maritime Antarctic soils. Graphic abstract: [Figure not available: see fulltext.]
AB - Antarctic King George Island is the fastest-warming area in the Southern Hemisphere. Organic matter inputs are scarce in this area, as they are derived from lichens, mosses, avian faeces, and minor inputs from two vascular plant species, Deschampsia antarctica É. Desv. and Colobanthus quitensis (Kunth) Bartl. Here, we examined the effects of freezing and thawing (FT) cycles on the priming effect (PE). We hypothesised that soil microorganisms preferentially use freeze-preserved soil organic carbon (SOC) exposed after thawing as an important energy source, resulting in intense PE. Two soils with contrasting clay contents were characterised by attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and incubated with and without 13C-glucose for 21 d. CO2 and 13CO2 were recorded from soil (i) without FT, (ii) one FT, and (iii) three FT cycles (− 18/12 °C). SOC exhibited low aromaticity stretching at 920 cm−1 and 1650 cm−1. Glucose-derived CO2 was maximal (26 ± 2.2 mg g−1 C) in the control soil without FT and decreased to 8.6 ± 0.1 mg g−1 C after three cycles. Glucose induced an intensely positive PE, 41–64% of basal respiration for a single FT cycle and 72–76% for no cycles. However, after three FT cycles, there was null or negative PE (− 9.5–0.4%). On average, the SOC content after net C balance increased with freezing frequency from 103 ± 14 to 212 ± 7. mg C kg−1 in low clay forming soil and from 129 ± 14 to 156 ± 2 mg C kg−1 in high clay forming soil and declined with increasing PE in both soils (R2 = 0.87, p < 0.01). Diminution in freezing frequency because of global warming will increase the positive PE, affecting the C sequestration of incipient SOC formation in maritime Antarctic soils. Graphic abstract: [Figure not available: see fulltext.]
KW - Antarctic soils
KW - Carbon isotope applications
KW - Extreme environment
KW - Initial soil development
KW - Organic matter balance
KW - Priming effect
UR - http://www.scopus.com/inward/record.url?scp=85151321731&partnerID=8YFLogxK
U2 - 10.1007/s10533-023-01032-z
DO - 10.1007/s10533-023-01032-z
M3 - Article
AN - SCOPUS:85151321731
VL - 163
SP - 311
EP - 325
JO - BIOGEOCHEMISTRY
JF - BIOGEOCHEMISTRY
SN - 0168-2563
IS - 3
ER -