Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter
To increase our understanding of carbon (C) cycling and storage in soils, we used 14C to trace C from roots into four soil organic matter (SOM) fractions and the movement of soil microbes in arctic wet sedge and tussock tundra. For both tundra types, the proportion of 14C activity in the soil was 6%...
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2002
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ftcdlib:oai:escholarship.org/ark:/13030/qt4hf0k8t6 2023-05-15T14:54:16+02:00 Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter Loya, WM Johnson, LC Kling, GW King, JY Reeburgh, WS Nadelhoffer, KJ 48-1-48-8 2002-01-01 application/pdf https://escholarship.org/uc/item/4hf0k8t6 unknown eScholarship, University of California qt4hf0k8t6 https://escholarship.org/uc/item/4hf0k8t6 CC-BY CC-BY Global Biogeochemical Cycles, vol 16, iss 4 soil organic matter microbial biomass roots photosynthates Arctic tundra C-14-labeling Meteorology & Atmospheric Sciences Atmospheric Sciences Geochemistry Oceanography article 2002 ftcdlib 2021-08-23T17:10:12Z To increase our understanding of carbon (C) cycling and storage in soils, we used 14C to trace C from roots into four soil organic matter (SOM) fractions and the movement of soil microbes in arctic wet sedge and tussock tundra. For both tundra types, the proportion of 14C activity in the soil was 6% of the total 14C-CO2 taken up by plants at each of the four harvests conducted 1, 7, 21, and 68 days after labeling. In tussock tundra, we observed rapid microbial transformation of labile C from root exudates into more stable SOM. In wet sedge tundra, there appears to be delayed or indirect microbial use of root exudates. The net amount of 14C label transfered to SOM by the end of the season in both tundra types was approximately equal to the amount transferred to soils 1 day after labeling, suggesting that transfer of 14C tracer from roots to soils continued through the growing season. Overall, C inputs from living roots contributes 24 g C m-2 yr-1 in tussock tundra and 8.8 g C m-2 yr-1 in wet sedge tundra. These results suggest rapid belowground allocation of C by plants and subsequent incorporation of much of this C into storage in the SOM. Article in Journal/Newspaper Arctic Tundra University of California: eScholarship Arctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
soil organic matter microbial biomass roots photosynthates Arctic tundra C-14-labeling Meteorology & Atmospheric Sciences Atmospheric Sciences Geochemistry Oceanography |
spellingShingle |
soil organic matter microbial biomass roots photosynthates Arctic tundra C-14-labeling Meteorology & Atmospheric Sciences Atmospheric Sciences Geochemistry Oceanography Loya, WM Johnson, LC Kling, GW King, JY Reeburgh, WS Nadelhoffer, KJ Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
topic_facet |
soil organic matter microbial biomass roots photosynthates Arctic tundra C-14-labeling Meteorology & Atmospheric Sciences Atmospheric Sciences Geochemistry Oceanography |
description |
To increase our understanding of carbon (C) cycling and storage in soils, we used 14C to trace C from roots into four soil organic matter (SOM) fractions and the movement of soil microbes in arctic wet sedge and tussock tundra. For both tundra types, the proportion of 14C activity in the soil was 6% of the total 14C-CO2 taken up by plants at each of the four harvests conducted 1, 7, 21, and 68 days after labeling. In tussock tundra, we observed rapid microbial transformation of labile C from root exudates into more stable SOM. In wet sedge tundra, there appears to be delayed or indirect microbial use of root exudates. The net amount of 14C label transfered to SOM by the end of the season in both tundra types was approximately equal to the amount transferred to soils 1 day after labeling, suggesting that transfer of 14C tracer from roots to soils continued through the growing season. Overall, C inputs from living roots contributes 24 g C m-2 yr-1 in tussock tundra and 8.8 g C m-2 yr-1 in wet sedge tundra. These results suggest rapid belowground allocation of C by plants and subsequent incorporation of much of this C into storage in the SOM. |
format |
Article in Journal/Newspaper |
author |
Loya, WM Johnson, LC Kling, GW King, JY Reeburgh, WS Nadelhoffer, KJ |
author_facet |
Loya, WM Johnson, LC Kling, GW King, JY Reeburgh, WS Nadelhoffer, KJ |
author_sort |
Loya, WM |
title |
Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
title_short |
Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
title_full |
Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
title_fullStr |
Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
title_full_unstemmed |
Pulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter |
title_sort |
pulse-labeling studies of carbon cycling in arctic tundra ecosystems: contribution of photosynthates to soil organic matter |
publisher |
eScholarship, University of California |
publishDate |
2002 |
url |
https://escholarship.org/uc/item/4hf0k8t6 |
op_coverage |
48-1-48-8 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_source |
Global Biogeochemical Cycles, vol 16, iss 4 |
op_relation |
qt4hf0k8t6 https://escholarship.org/uc/item/4hf0k8t6 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766325992594341888 |