Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil
Arctic tundra fires have been increasing in extent, frequency and intensity and are likely impacting both soil nitrogen (N) and phosphorus (P) cycling and, thus, permafrost ecosystem functioning. However, little is known on the underlying microbial mechanisms, and different fire intensities were neg...
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ftdoajarticles:oai:doaj.org/article:d6e97662bc9046448eb2f52d045ccac5 2023-10-09T21:48:35+02:00 Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil Elisabeth Ramm Per Lennart Ambus Silvia Gschwendtner Chunyan Liu Michael Schloter Michael Dannenmann 2023-10-01T00:00:00Z https://doi.org/10.1016/j.geoderma.2023.116627 https://doaj.org/article/d6e97662bc9046448eb2f52d045ccac5 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S001670612300304X https://doaj.org/toc/1872-6259 1872-6259 doi:10.1016/j.geoderma.2023.116627 https://doaj.org/article/d6e97662bc9046448eb2f52d045ccac5 Geoderma, Vol 438, Iss , Pp 116627- (2023) Arctic Fire intensity Nitrogen Phosphorus Soil microbiome qPCR Science Q article 2023 ftdoajarticles https://doi.org/10.1016/j.geoderma.2023.116627 2023-09-10T00:34:17Z Arctic tundra fires have been increasing in extent, frequency and intensity and are likely impacting both soil nitrogen (N) and phosphorus (P) cycling and, thus, permafrost ecosystem functioning. However, little is known on the underlying microbial mechanisms, and different fire intensities were neglected so far. To better understand immediate influences of different fire intensities on the soil microbiome involved in nutrient cycling in permafrost-affected soil, we deployed experimental fires with low and high intensity on an Arctic tundra soil on Disko Island, Greenland. Soil sampling took place three days postfire and included an unburned control. Using quantitative real-time PCR, copy numbers of 16S and ITS as well as of 17 genes coding for functional microbial groups catalyzing major steps of N and P turnover were assessed.We show that fires change the abundance of microbial groups already after three days with fire intensity as key mediating factor. Specifically, low-intensity fire significantly enhanced the abundance of chiA mineralizers and ammonia-oxidizing archaea, while other groups were not affected. On the contrary, high-intensity fire decreased the abundance of chiA mineralizers and of microbes that fix dinitrogen, indicating a dampening effect on N cycling. Only high-intensity fires enhanced ammonium concentrations (by an order of magnitude). This can be explained by burned plant material and the absence of plant uptake, together with impaired further N processing. Fire with high intensity also decreased nirK-type denitrifiers. In contrast, after fire with low intensity there was a trend for a decreased nosZ : (nirK+nirS) ratio, indicating – together with increased nitrate concentrations – an enhanced potential for nitric oxide and nitrous oxide emissions. Concerning P transformation, only gcd was affected in the short term which is important for P solubilization.Changes in gene numbers consistently showed the same contrasting pattern of elevated abundance with low fire intensity and decreased ... Article in Journal/Newspaper Arctic Greenland permafrost Tundra Directory of Open Access Journals: DOAJ Articles Arctic Greenland Geoderma 438 116627 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic Fire intensity Nitrogen Phosphorus Soil microbiome qPCR Science Q |
spellingShingle |
Arctic Fire intensity Nitrogen Phosphorus Soil microbiome qPCR Science Q Elisabeth Ramm Per Lennart Ambus Silvia Gschwendtner Chunyan Liu Michael Schloter Michael Dannenmann Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
topic_facet |
Arctic Fire intensity Nitrogen Phosphorus Soil microbiome qPCR Science Q |
description |
Arctic tundra fires have been increasing in extent, frequency and intensity and are likely impacting both soil nitrogen (N) and phosphorus (P) cycling and, thus, permafrost ecosystem functioning. However, little is known on the underlying microbial mechanisms, and different fire intensities were neglected so far. To better understand immediate influences of different fire intensities on the soil microbiome involved in nutrient cycling in permafrost-affected soil, we deployed experimental fires with low and high intensity on an Arctic tundra soil on Disko Island, Greenland. Soil sampling took place three days postfire and included an unburned control. Using quantitative real-time PCR, copy numbers of 16S and ITS as well as of 17 genes coding for functional microbial groups catalyzing major steps of N and P turnover were assessed.We show that fires change the abundance of microbial groups already after three days with fire intensity as key mediating factor. Specifically, low-intensity fire significantly enhanced the abundance of chiA mineralizers and ammonia-oxidizing archaea, while other groups were not affected. On the contrary, high-intensity fire decreased the abundance of chiA mineralizers and of microbes that fix dinitrogen, indicating a dampening effect on N cycling. Only high-intensity fires enhanced ammonium concentrations (by an order of magnitude). This can be explained by burned plant material and the absence of plant uptake, together with impaired further N processing. Fire with high intensity also decreased nirK-type denitrifiers. In contrast, after fire with low intensity there was a trend for a decreased nosZ : (nirK+nirS) ratio, indicating – together with increased nitrate concentrations – an enhanced potential for nitric oxide and nitrous oxide emissions. Concerning P transformation, only gcd was affected in the short term which is important for P solubilization.Changes in gene numbers consistently showed the same contrasting pattern of elevated abundance with low fire intensity and decreased ... |
format |
Article in Journal/Newspaper |
author |
Elisabeth Ramm Per Lennart Ambus Silvia Gschwendtner Chunyan Liu Michael Schloter Michael Dannenmann |
author_facet |
Elisabeth Ramm Per Lennart Ambus Silvia Gschwendtner Chunyan Liu Michael Schloter Michael Dannenmann |
author_sort |
Elisabeth Ramm |
title |
Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
title_short |
Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
title_full |
Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
title_fullStr |
Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
title_full_unstemmed |
Fire intensity regulates the short-term postfire response of the microbiome in Arctic tundra soil |
title_sort |
fire intensity regulates the short-term postfire response of the microbiome in arctic tundra soil |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.geoderma.2023.116627 https://doaj.org/article/d6e97662bc9046448eb2f52d045ccac5 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland permafrost Tundra |
genre_facet |
Arctic Greenland permafrost Tundra |
op_source |
Geoderma, Vol 438, Iss , Pp 116627- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S001670612300304X https://doaj.org/toc/1872-6259 1872-6259 doi:10.1016/j.geoderma.2023.116627 https://doaj.org/article/d6e97662bc9046448eb2f52d045ccac5 |
op_doi |
https://doi.org/10.1016/j.geoderma.2023.116627 |
container_title |
Geoderma |
container_volume |
438 |
container_start_page |
116627 |
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1779311667431079936 |