Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems
Abstract Global change in the Arctic promotes deeper soil thaw and enhanced soil microbial activity, increasing nitrogen (N) and phosphorus (P) availability to plants and microbes in strongly nutrient‐limited ecosystems. This critical, positive climate feedback has been examined through fertilizatio...
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ftdoajarticles:oai:doaj.org/article:b358738b87dc46cbb056998d2f507e06 2023-05-15T15:01:57+02:00 Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems Jennie R. McLaren Kate M. Buckeridge 2019-07-01T00:00:00Z https://doi.org/10.1002/ecs2.2735 https://doaj.org/article/b358738b87dc46cbb056998d2f507e06 EN eng Wiley https://doi.org/10.1002/ecs2.2735 https://doaj.org/toc/2150-8925 2150-8925 doi:10.1002/ecs2.2735 https://doaj.org/article/b358738b87dc46cbb056998d2f507e06 Ecosphere, Vol 10, Iss 7, Pp n/a-n/a (2019) extracellular enzyme activity fertilization long term microbial biomass moist non‐acidic tundra nutrient limitation Ecology QH540-549.5 article 2019 ftdoajarticles https://doi.org/10.1002/ecs2.2735 2022-12-31T13:28:59Z Abstract Global change in the Arctic promotes deeper soil thaw and enhanced soil microbial activity, increasing nitrogen (N) and phosphorus (P) availability to plants and microbes in strongly nutrient‐limited ecosystems. This critical, positive climate feedback has been examined through fertilization experiments that describe short‐term (<10 yr) above‐ or belowground responses to combined NP additions, with evidence of enhanced shrub growth, nutrient availability, and soil organic matter decomposition. There has been less opportunity for long‐term comparisons of both above‐ and belowground responses with factorial N and P additions in different systems, despite broad awareness that ecosystem response can shift with time, and the potential for decoupled above‐ vs. belowground or N vs. P responses, currently and with further predicted global change. We examined the response of the plants, soil microbes, and soil nutrients, to factorial N and P additions in the moist acidic tundra (MAT; 26 yr of nutrient additions) and moist non‐acidic tundra (MNT; 16 yr). Aboveground, the MAT plant community continues to change as predicted by earlier studies: Functional groups responded independently to N and P, but NDVI‐biomass, especially of Betula nana, only increased with N addition. Unlike shorter‐term MNT studies, the MNT vegetation, which does not include B. nana, shows few new fertilization responses. Belowground responses were not predicted by aboveground responses in either MAT or MNT. In contrast to the N response aboveground, MAT microbial biomass responded positively and microbial phosphatase activity negatively to P additions, implying possible release from microbial P limitation. Critically, earlier published results of declines in soil total carbon (C) with combined NP addition in the MAT are not present in the long term. We make two conclusions: (1) Arctic ecosystems are not universally N‐limited but also exhibit complex responses to P alone or in combination with N; and (2) the presence or absence of key ... Article in Journal/Newspaper Arctic Betula nana Tundra Directory of Open Access Journals: DOAJ Articles Arctic Ecosphere 10 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
extracellular enzyme activity fertilization long term microbial biomass moist non‐acidic tundra nutrient limitation Ecology QH540-549.5 |
spellingShingle |
extracellular enzyme activity fertilization long term microbial biomass moist non‐acidic tundra nutrient limitation Ecology QH540-549.5 Jennie R. McLaren Kate M. Buckeridge Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
topic_facet |
extracellular enzyme activity fertilization long term microbial biomass moist non‐acidic tundra nutrient limitation Ecology QH540-549.5 |
description |
Abstract Global change in the Arctic promotes deeper soil thaw and enhanced soil microbial activity, increasing nitrogen (N) and phosphorus (P) availability to plants and microbes in strongly nutrient‐limited ecosystems. This critical, positive climate feedback has been examined through fertilization experiments that describe short‐term (<10 yr) above‐ or belowground responses to combined NP additions, with evidence of enhanced shrub growth, nutrient availability, and soil organic matter decomposition. There has been less opportunity for long‐term comparisons of both above‐ and belowground responses with factorial N and P additions in different systems, despite broad awareness that ecosystem response can shift with time, and the potential for decoupled above‐ vs. belowground or N vs. P responses, currently and with further predicted global change. We examined the response of the plants, soil microbes, and soil nutrients, to factorial N and P additions in the moist acidic tundra (MAT; 26 yr of nutrient additions) and moist non‐acidic tundra (MNT; 16 yr). Aboveground, the MAT plant community continues to change as predicted by earlier studies: Functional groups responded independently to N and P, but NDVI‐biomass, especially of Betula nana, only increased with N addition. Unlike shorter‐term MNT studies, the MNT vegetation, which does not include B. nana, shows few new fertilization responses. Belowground responses were not predicted by aboveground responses in either MAT or MNT. In contrast to the N response aboveground, MAT microbial biomass responded positively and microbial phosphatase activity negatively to P additions, implying possible release from microbial P limitation. Critically, earlier published results of declines in soil total carbon (C) with combined NP addition in the MAT are not present in the long term. We make two conclusions: (1) Arctic ecosystems are not universally N‐limited but also exhibit complex responses to P alone or in combination with N; and (2) the presence or absence of key ... |
format |
Article in Journal/Newspaper |
author |
Jennie R. McLaren Kate M. Buckeridge |
author_facet |
Jennie R. McLaren Kate M. Buckeridge |
author_sort |
Jennie R. McLaren |
title |
Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
title_short |
Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
title_full |
Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
title_fullStr |
Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
title_full_unstemmed |
Decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
title_sort |
decoupled above‐ and belowground responses to multi‐decadal nitrogen and phosphorus amendments in two tundra ecosystems |
publisher |
Wiley |
publishDate |
2019 |
url |
https://doi.org/10.1002/ecs2.2735 https://doaj.org/article/b358738b87dc46cbb056998d2f507e06 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Betula nana Tundra |
genre_facet |
Arctic Betula nana Tundra |
op_source |
Ecosphere, Vol 10, Iss 7, Pp n/a-n/a (2019) |
op_relation |
https://doi.org/10.1002/ecs2.2735 https://doaj.org/toc/2150-8925 2150-8925 doi:10.1002/ecs2.2735 https://doaj.org/article/b358738b87dc46cbb056998d2f507e06 |
op_doi |
https://doi.org/10.1002/ecs2.2735 |
container_title |
Ecosphere |
container_volume |
10 |
container_issue |
7 |
_version_ |
1766333960065908736 |