Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale
The effects of aquatic carbon exports on grassland ecosystem carbon balance is unclear. Here we quantified the seasonal and annual net ecosystem carbon budget (NECB) of an alpine grassland ecosystem in the Qinghai-Tibet Plateau (QTP) permafrost region with integrative terrestrial and aquatic carbon...
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Language: | English |
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ftchinacadscimhe:oai:ir.imde.ac.cn:131551/34901 2023-05-15T17:57:25+02:00 Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale Song Chunlin Wang Genxu Hu Zhaoyong Zhang Tao Huang Kewei Chen Xiaopeng Li Yang 2020 http://ir.imde.ac.cn/handle/131551/34901 https://doi.org/10.1016/j.agrformet.2020.108021 英语 eng ELSEVIER AGRICULTURAL AND FOREST METEOROLOGY http://ir.imde.ac.cn/handle/131551/34901 doi:10.1016/j.agrformet.2020.108021 cn.org.cspace.api.content.CopyrightPolicy@22969d55 Net ecosystem carbon budget Grassland Eddy covariance Riverine carbon Catchment Qinghai-Tibet Plateau DISSOLVED ORGANIC-CARBON PERMAFROST REGION NITROGEN-FERTILIZATION ALPINE GRASSLANDS EDDY-COVARIANCE CO2 EMISSIONS GHG FLUX CLIMATE BALANCE SOIL Agriculture Forestry Meteorology & Atmospheric Sciences Agronomy Article 期刊论文 2020 ftchinacadscimhe https://doi.org/10.1016/j.agrformet.2020.108021 2022-12-19T18:23:19Z The effects of aquatic carbon exports on grassland ecosystem carbon balance is unclear. Here we quantified the seasonal and annual net ecosystem carbon budget (NECB) of an alpine grassland ecosystem in the Qinghai-Tibet Plateau (QTP) permafrost region with integrative terrestrial and aquatic carbon flux measurements. The terrestrial carbon fluxes, including the net ecosystem production (NEP) and CH4 flux, were derived from eddy covariance and previous chamber-based measurements. The aquatic carbon fluxes, including dissolved organic carbon, biogenic dissolved inorganic carbon, particulate carbon, and riverine CO2 efflux of the catchment, were determined with stream monitoring. We found that NECB exhibited distinct seasonal features for the grassland ecosystem, which shifted from a carbon sink in growing season (68.8 +/- 8.7 g C m(-2)) to a carbon source in nongrowing season (- 41.1 +/- 2.4 g C m(-2)), while the NECB (27.7 +/- 6 g C m(-2) yr(-1)) demonstrated a net carbon sink at an annual basis. The total aquatic carbon flux (TAC, 11.8 +/- 1.5 g C m(-2) yr(-1)) offset 14% of the land carbon assimilation for growing season and 30% of the annual land carbon assimilation after subtracting ecosystem respiration. The higher TAC/NEP ratios in low NEP months indicated that aquatic carbon was more important on offsetting terrestrial carbon sink when NEP was low. Our results show a large contribution of aquatic carbon to NECB in a QTP grassland ecosystem, which suggest that disregarding the aquatic carbon flux can substantially overestimate the strength of terrestrial carbon sink. As aquatic carbon is coupled with hydrological processes, TAC is crucially important for NECB in the cryosphere ecosystem since the drastic hydrology and permafrost change can transport more soil carbon into the fluvial networks. More studies on NECB is needed, especially when the ecosystem have a low NEP and actively changing hydrological processes. Article in Journal/Newspaper permafrost IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) Agricultural and Forest Meteorology 290 108021 |
institution |
Open Polar |
collection |
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) |
op_collection_id |
ftchinacadscimhe |
language |
English |
topic |
Net ecosystem carbon budget Grassland Eddy covariance Riverine carbon Catchment Qinghai-Tibet Plateau DISSOLVED ORGANIC-CARBON PERMAFROST REGION NITROGEN-FERTILIZATION ALPINE GRASSLANDS EDDY-COVARIANCE CO2 EMISSIONS GHG FLUX CLIMATE BALANCE SOIL Agriculture Forestry Meteorology & Atmospheric Sciences Agronomy |
spellingShingle |
Net ecosystem carbon budget Grassland Eddy covariance Riverine carbon Catchment Qinghai-Tibet Plateau DISSOLVED ORGANIC-CARBON PERMAFROST REGION NITROGEN-FERTILIZATION ALPINE GRASSLANDS EDDY-COVARIANCE CO2 EMISSIONS GHG FLUX CLIMATE BALANCE SOIL Agriculture Forestry Meteorology & Atmospheric Sciences Agronomy Song Chunlin Wang Genxu Hu Zhaoyong Zhang Tao Huang Kewei Chen Xiaopeng Li Yang Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
topic_facet |
Net ecosystem carbon budget Grassland Eddy covariance Riverine carbon Catchment Qinghai-Tibet Plateau DISSOLVED ORGANIC-CARBON PERMAFROST REGION NITROGEN-FERTILIZATION ALPINE GRASSLANDS EDDY-COVARIANCE CO2 EMISSIONS GHG FLUX CLIMATE BALANCE SOIL Agriculture Forestry Meteorology & Atmospheric Sciences Agronomy |
description |
The effects of aquatic carbon exports on grassland ecosystem carbon balance is unclear. Here we quantified the seasonal and annual net ecosystem carbon budget (NECB) of an alpine grassland ecosystem in the Qinghai-Tibet Plateau (QTP) permafrost region with integrative terrestrial and aquatic carbon flux measurements. The terrestrial carbon fluxes, including the net ecosystem production (NEP) and CH4 flux, were derived from eddy covariance and previous chamber-based measurements. The aquatic carbon fluxes, including dissolved organic carbon, biogenic dissolved inorganic carbon, particulate carbon, and riverine CO2 efflux of the catchment, were determined with stream monitoring. We found that NECB exhibited distinct seasonal features for the grassland ecosystem, which shifted from a carbon sink in growing season (68.8 +/- 8.7 g C m(-2)) to a carbon source in nongrowing season (- 41.1 +/- 2.4 g C m(-2)), while the NECB (27.7 +/- 6 g C m(-2) yr(-1)) demonstrated a net carbon sink at an annual basis. The total aquatic carbon flux (TAC, 11.8 +/- 1.5 g C m(-2) yr(-1)) offset 14% of the land carbon assimilation for growing season and 30% of the annual land carbon assimilation after subtracting ecosystem respiration. The higher TAC/NEP ratios in low NEP months indicated that aquatic carbon was more important on offsetting terrestrial carbon sink when NEP was low. Our results show a large contribution of aquatic carbon to NECB in a QTP grassland ecosystem, which suggest that disregarding the aquatic carbon flux can substantially overestimate the strength of terrestrial carbon sink. As aquatic carbon is coupled with hydrological processes, TAC is crucially important for NECB in the cryosphere ecosystem since the drastic hydrology and permafrost change can transport more soil carbon into the fluvial networks. More studies on NECB is needed, especially when the ecosystem have a low NEP and actively changing hydrological processes. |
format |
Article in Journal/Newspaper |
author |
Song Chunlin Wang Genxu Hu Zhaoyong Zhang Tao Huang Kewei Chen Xiaopeng Li Yang |
author_facet |
Song Chunlin Wang Genxu Hu Zhaoyong Zhang Tao Huang Kewei Chen Xiaopeng Li Yang |
author_sort |
Song Chunlin |
title |
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
title_short |
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
title_full |
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
title_fullStr |
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
title_full_unstemmed |
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
title_sort |
net ecosystem carbon budget of a grassland ecosystem in central qinghai-tibet plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale |
publisher |
ELSEVIER |
publishDate |
2020 |
url |
http://ir.imde.ac.cn/handle/131551/34901 https://doi.org/10.1016/j.agrformet.2020.108021 |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Tac |
geographic_facet |
Tac |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
AGRICULTURAL AND FOREST METEOROLOGY http://ir.imde.ac.cn/handle/131551/34901 doi:10.1016/j.agrformet.2020.108021 |
op_rights |
cn.org.cspace.api.content.CopyrightPolicy@22969d55 |
op_doi |
https://doi.org/10.1016/j.agrformet.2020.108021 |
container_title |
Agricultural and Forest Meteorology |
container_volume |
290 |
container_start_page |
108021 |
_version_ |
1766165842227101696 |