Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting
30 ECTS thesis approved in partial fulfillment of a double Nordic Master MSc degree in environmental changes at higher latitudes (EnCHiL), from University of Lund and Agricultural University of Iceland. With warming in soils due to climate change, a series of secondary factors arise, which have mult...
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ftskemman:oai:skemman.is:1946/45827 2024-09-15T17:34:29+00:00 Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting Franklin Harris 1992- Landbúnaðarháskóli Íslands 2023-06 application/pdf http://hdl.handle.net/1946/45827 en eng http://hdl.handle.net/1946/45827 Microbial Ecology Soil Carbon Dynamics High Latitudes Climate Change Moisture Stress Isotopes Respiration Trait Based Ecology Soil Microbes Environmental Changes in High Latitudes EnCHiL Umhverfisbreytingar á norðurslóðum Jarðvegur Vistfræði Örveruvistfræði Thesis Master's 2023 ftskemman 2024-08-14T04:39:52Z 30 ECTS thesis approved in partial fulfillment of a double Nordic Master MSc degree in environmental changes at higher latitudes (EnCHiL), from University of Lund and Agricultural University of Iceland. With warming in soils due to climate change, a series of secondary factors arise, which have multifaceted effects on soil microbial communities. Of these, alterations to soil moisture are among the most crucial to understanding how microbial functions will change in the face of climate change. As living organisms, microbes must adapt to their environment, and their adaptations are reflected in their response to contemporary events. How they respond can determine the fate of soil organic matter and have relevant feedback to climate systems. In this thesis, I address how the legacy effects of a soil microbial community affect its response to a drying and rewetting event in terms of resilience and resistance, as well as how these strategies can affect carbon dynamics in subarctic ecosystems. I achieved this by taking soil samples from study sites that have undergone two-year warming in Abisko, Sweden. I then subjected them to a drying and rewetting cycle, assessing the samples as they dried down and subsequently responded to being rewet. During this time, I measured bacterial and fungal growth via stable isotope probing as well as respiration via gas chromatography. I found that while moisture was affected, microbial resistance was unaffected by warming treatments. However, resilience was affected by warming treatments. Responses also differed primarily based on NDVI, possibly indicating the importance of plant inputs of carbon to the microbial response. Possible conceptual frameworks are then used to explain the observations, notably the YAS framework. Implications for carbon budgeting and models are inferred from these findings. I conclude that interactions between microbes and moisture and plant inputs impact microbial response to moisture stress in warming experiments and that future experiments may want to ... Master Thesis Abisko Iceland Subarctic Skemman (Iceland) |
institution |
Open Polar |
collection |
Skemman (Iceland) |
op_collection_id |
ftskemman |
language |
English |
topic |
Microbial Ecology Soil Carbon Dynamics High Latitudes Climate Change Moisture Stress Isotopes Respiration Trait Based Ecology Soil Microbes Environmental Changes in High Latitudes EnCHiL Umhverfisbreytingar á norðurslóðum Jarðvegur Vistfræði Örveruvistfræði |
spellingShingle |
Microbial Ecology Soil Carbon Dynamics High Latitudes Climate Change Moisture Stress Isotopes Respiration Trait Based Ecology Soil Microbes Environmental Changes in High Latitudes EnCHiL Umhverfisbreytingar á norðurslóðum Jarðvegur Vistfræði Örveruvistfræði Franklin Harris 1992- Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
topic_facet |
Microbial Ecology Soil Carbon Dynamics High Latitudes Climate Change Moisture Stress Isotopes Respiration Trait Based Ecology Soil Microbes Environmental Changes in High Latitudes EnCHiL Umhverfisbreytingar á norðurslóðum Jarðvegur Vistfræði Örveruvistfræði |
description |
30 ECTS thesis approved in partial fulfillment of a double Nordic Master MSc degree in environmental changes at higher latitudes (EnCHiL), from University of Lund and Agricultural University of Iceland. With warming in soils due to climate change, a series of secondary factors arise, which have multifaceted effects on soil microbial communities. Of these, alterations to soil moisture are among the most crucial to understanding how microbial functions will change in the face of climate change. As living organisms, microbes must adapt to their environment, and their adaptations are reflected in their response to contemporary events. How they respond can determine the fate of soil organic matter and have relevant feedback to climate systems. In this thesis, I address how the legacy effects of a soil microbial community affect its response to a drying and rewetting event in terms of resilience and resistance, as well as how these strategies can affect carbon dynamics in subarctic ecosystems. I achieved this by taking soil samples from study sites that have undergone two-year warming in Abisko, Sweden. I then subjected them to a drying and rewetting cycle, assessing the samples as they dried down and subsequently responded to being rewet. During this time, I measured bacterial and fungal growth via stable isotope probing as well as respiration via gas chromatography. I found that while moisture was affected, microbial resistance was unaffected by warming treatments. However, resilience was affected by warming treatments. Responses also differed primarily based on NDVI, possibly indicating the importance of plant inputs of carbon to the microbial response. Possible conceptual frameworks are then used to explain the observations, notably the YAS framework. Implications for carbon budgeting and models are inferred from these findings. I conclude that interactions between microbes and moisture and plant inputs impact microbial response to moisture stress in warming experiments and that future experiments may want to ... |
author2 |
Landbúnaðarháskóli Íslands |
format |
Master Thesis |
author |
Franklin Harris 1992- |
author_facet |
Franklin Harris 1992- |
author_sort |
Franklin Harris 1992- |
title |
Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
title_short |
Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
title_full |
Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
title_fullStr |
Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
title_full_unstemmed |
Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
title_sort |
legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting |
publishDate |
2023 |
url |
http://hdl.handle.net/1946/45827 |
genre |
Abisko Iceland Subarctic |
genre_facet |
Abisko Iceland Subarctic |
op_relation |
http://hdl.handle.net/1946/45827 |
_version_ |
1810484321376534528 |