Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and 13CO2 pulse labeling
(2015) In Science of the Total Environment 505. p.1213-1224- Abstract
- The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements with 13CO2 pulse labeling we applied a powerful new approach to measure absolute fluxes of assimilates within and between various pools of the plant-soil-atmosphere system. The roots and soil each store roughly 50% of the overall C... (More)
- The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements with 13CO2 pulse labeling we applied a powerful new approach to measure absolute fluxes of assimilates within and between various pools of the plant-soil-atmosphere system. The roots and soil each store roughly 50% of the overall C in the system (76 Mg C ha−1), with only a minor contribution from shoots, which is also expressed in the root:shoot ratio of 90. During June and July the pasture acted as a weak C sink with a strong uptake of approximately 2 g C m−2 d−1 in the first half of July. The root turf was the main compartment for the turnover of
photoassimilates, with a subset of highly dynamic roots (mean residence time 20 days), and plays a key role for the C cycling and C storage in this ecosystem. The short-termgrazing cessation only affected aboveground biomass but not ecosystem scale C exchange or assimilate allocation into roots and soil. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7991835
- author
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Alpine grassland, Carbon cycle, Land use changes, Grazing, Tibetan-Plateau, Tibet, eddy covariance
- in
- Science of the Total Environment
- volume
- 505
- pages
- 1213 - 1224
- publisher
- Elsevier
- external identifiers
-
- scopus:84915746497
- pmid:25461119
- ISSN
- 1879-1026
- DOI
- 10.1016/j.scitotenv.2014.10.082
- language
- English
- LU publication?
- yes
- additional info
- Supplementary Dataset: Ingrisch, Johannes; Biermann, Tobias; Seeber, Elke; Leipold, Thomas; Li, Maoshan; Ma, Yaoming; Xu, Xingliang; Miehe, Georg; Guggenberger, Georg; Foken, Thomas; Kuzyakov, Yakov (2014): Carbon pools and fluxes measured during a field campaign conducted in 2010 on the Tibetan Plateau at Kema. PANGAEA, https://doi.org/10.1594/PANGAEA.833208
- id
- 9ed770b2-047b-4b40-97a9-e4bf4519e91a (old id 7991835)
- date added to LUP
- 2016-04-01 10:14:44
- date last changed
- 2022-02-02 07:52:25
@article{9ed770b2-047b-4b40-97a9-e4bf4519e91a, abstract = {{The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements with 13CO2 pulse labeling we applied a powerful new approach to measure absolute fluxes of assimilates within and between various pools of the plant-soil-atmosphere system. The roots and soil each store roughly 50% of the overall C in the system (76 Mg C ha−1), with only a minor contribution from shoots, which is also expressed in the root:shoot ratio of 90. During June and July the pasture acted as a weak C sink with a strong uptake of approximately 2 g C m−2 d−1 in the first half of July. The root turf was the main compartment for the turnover of<br/><br> photoassimilates, with a subset of highly dynamic roots (mean residence time 20 days), and plays a key role for the C cycling and C storage in this ecosystem. The short-termgrazing cessation only affected aboveground biomass but not ecosystem scale C exchange or assimilate allocation into roots and soil.}}, author = {{Ingrisch, Johannes and Biermann, Tobias and Seeber, Elke and Leipold, Thomas and Li, Maoshan and Ma, Yaoming and Xu, Xingliang and Miehe, Georg and Guggenberger, Georg and Foken, Thomas and Kuzyakov, Yakov}}, issn = {{1879-1026}}, keywords = {{Alpine grassland; Carbon cycle; Land use changes; Grazing; Tibetan-Plateau; Tibet; eddy covariance}}, language = {{eng}}, pages = {{1213--1224}}, publisher = {{Elsevier}}, series = {{Science of the Total Environment}}, title = {{Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and 13CO<sub>2</sub> pulse labeling}}, url = {{http://dx.doi.org/10.1016/j.scitotenv.2014.10.082}}, doi = {{10.1016/j.scitotenv.2014.10.082}}, volume = {{505}}, year = {{2015}}, }