Inter-annual variability of net and gross ecosystem carbon fluxes: A review
As the lifetime of regional flux networks approach twenty years, there is a growing number of papers that have published long term records (5 years or more) of net carbon fluxes between ecosystems and the atmosphere. Unanswered questions from this body of work are: 1) how variable are carbon fluxes...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2018
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/4k44w02m |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt4k44w02m |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt4k44w02m 2024-01-14T10:05:07+01:00 Inter-annual variability of net and gross ecosystem carbon fluxes: A review Baldocchi, Dennis Chu, Housen Reichstein, Markus 2018-02-01 application/pdf https://escholarship.org/uc/item/4k44w02m unknown eScholarship, University of California qt4k44w02m https://escholarship.org/uc/item/4k44w02m public Agricultural Veterinary and Food Sciences Biological Sciences Ecology Forestry Sciences Climate Action Eddy covariance FLUXNET Net ecosystem exchange Carbon cycle Earth Sciences Agricultural and Veterinary Sciences Meteorology & Atmospheric Sciences article 2018 ftcdlib 2023-12-18T19:08:31Z As the lifetime of regional flux networks approach twenty years, there is a growing number of papers that have published long term records (5 years or more) of net carbon fluxes between ecosystems and the atmosphere. Unanswered questions from this body of work are: 1) how variable are carbon fluxes on a year to year basis?; 2) what are the biophysical factors that may cause interannual variability and/or temporal trends in carbon fluxes?; and 3) how does the biophysical control on this carbon flux variability differ by climate and ecological spaces? To address these questions, we surveyed published data from 59 sites that reported on five or more years of continuous measurements, yielding 544 site-years of data.We found that the standard deviation of the interannual variability in net ecosystem carbon exchange (162gCm⁻²y⁻¹) is large relative to its population mean (−200gCm⁻² y⁻¹). Broad-leaved evergreen forests and crops experienced the greatest absolute variability in interannual net carbon exchange (greater than ±300gCm⁻²y⁻¹) and boreal evergreen forests and maritime wetlands were among the least variable (less than ±40 gCm⁻²y⁻¹).A disproportionate fraction of the yearly variability in net ecosystem exchange was associated with biophysical factors that modulated ecosystem photosynthesis rather than ecosystem respiration. Yet, there was appreciable and statistically significant covariance between ecosystem photosynthesis and respiration. Consequently, biophysical conditions that conspired to increase ecosystem photosynthesis to from one year to the next were associated with an increase in ecosystem respiration, and vice versa; on average, the year to year change in respiration was 40% as large as the year to year change in photosynthesis. The analysis also identified sets of ecosystems that are on the verge of switching from being carbon sinks to carbon sources. These include sites in the Arctic tundra, the evergreen forests in the Pacific northwest and some grasslands, where year to year changes in respiration ... Article in Journal/Newspaper Arctic Tundra University of California: eScholarship Arctic Pacific |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Agricultural Veterinary and Food Sciences Biological Sciences Ecology Forestry Sciences Climate Action Eddy covariance FLUXNET Net ecosystem exchange Carbon cycle Earth Sciences Agricultural and Veterinary Sciences Meteorology & Atmospheric Sciences |
spellingShingle |
Agricultural Veterinary and Food Sciences Biological Sciences Ecology Forestry Sciences Climate Action Eddy covariance FLUXNET Net ecosystem exchange Carbon cycle Earth Sciences Agricultural and Veterinary Sciences Meteorology & Atmospheric Sciences Baldocchi, Dennis Chu, Housen Reichstein, Markus Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
topic_facet |
Agricultural Veterinary and Food Sciences Biological Sciences Ecology Forestry Sciences Climate Action Eddy covariance FLUXNET Net ecosystem exchange Carbon cycle Earth Sciences Agricultural and Veterinary Sciences Meteorology & Atmospheric Sciences |
description |
As the lifetime of regional flux networks approach twenty years, there is a growing number of papers that have published long term records (5 years or more) of net carbon fluxes between ecosystems and the atmosphere. Unanswered questions from this body of work are: 1) how variable are carbon fluxes on a year to year basis?; 2) what are the biophysical factors that may cause interannual variability and/or temporal trends in carbon fluxes?; and 3) how does the biophysical control on this carbon flux variability differ by climate and ecological spaces? To address these questions, we surveyed published data from 59 sites that reported on five or more years of continuous measurements, yielding 544 site-years of data.We found that the standard deviation of the interannual variability in net ecosystem carbon exchange (162gCm⁻²y⁻¹) is large relative to its population mean (−200gCm⁻² y⁻¹). Broad-leaved evergreen forests and crops experienced the greatest absolute variability in interannual net carbon exchange (greater than ±300gCm⁻²y⁻¹) and boreal evergreen forests and maritime wetlands were among the least variable (less than ±40 gCm⁻²y⁻¹).A disproportionate fraction of the yearly variability in net ecosystem exchange was associated with biophysical factors that modulated ecosystem photosynthesis rather than ecosystem respiration. Yet, there was appreciable and statistically significant covariance between ecosystem photosynthesis and respiration. Consequently, biophysical conditions that conspired to increase ecosystem photosynthesis to from one year to the next were associated with an increase in ecosystem respiration, and vice versa; on average, the year to year change in respiration was 40% as large as the year to year change in photosynthesis. The analysis also identified sets of ecosystems that are on the verge of switching from being carbon sinks to carbon sources. These include sites in the Arctic tundra, the evergreen forests in the Pacific northwest and some grasslands, where year to year changes in respiration ... |
format |
Article in Journal/Newspaper |
author |
Baldocchi, Dennis Chu, Housen Reichstein, Markus |
author_facet |
Baldocchi, Dennis Chu, Housen Reichstein, Markus |
author_sort |
Baldocchi, Dennis |
title |
Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
title_short |
Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
title_full |
Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
title_fullStr |
Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
title_full_unstemmed |
Inter-annual variability of net and gross ecosystem carbon fluxes: A review |
title_sort |
inter-annual variability of net and gross ecosystem carbon fluxes: a review |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/4k44w02m |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_relation |
qt4k44w02m https://escholarship.org/uc/item/4k44w02m |
op_rights |
public |
_version_ |
1788059523936681984 |