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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, Supplement to: Ingrisch, J et al. (2015): Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and 13CO2 pulse labeling. Science of the Total Environment, 505, 1213-1224, https://doi.org/10.1016/j.scitotenv.2014.10.082

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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), 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/ 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-term grazing cessation only affected aboveground biomass but not ecosystem scale C exchange or assimilate allocation into roots and soil.
Further details:
Biermann, Tobias; Babel, Wolfgang; Becker, Lena; Coners, Heinz; Foken, Thomas; Guggenberger, Georg; He, Siyuan; Ingrisch, Johannes; Kuzyakov, Yakov; Leuschner, Christoph; Miehe, Georg; Richards, Keith; Seeber, Elke; Wesche, Karsten (2011): Tibet Plateau Atmosphere-Ecology-Glaciology Cluster Joint Kobresia Ecosystem Experiment: Documentation of the first Intensive Observation Period Summer 2010 in Kema, Tibet. Arbeitsergebnisse, University of Bayreuth, Department of Micrometeorology, 44, 107 pp, hdl:10013/epic.43938.d001
Biermann, Tobias; Seeber, Elke; Schleuß, Per; Willinghöfer, Sandra; Leonbacher, Jürgen; Schützenmeister, Klaus; Steingräber, Laura; Babel, Wolfgang; Coners, Heinz; Foken, Thomas; Guggenberger, Georg; Kuzyakov, Yakov; Leuschner, Christoph; Miehe, Georg; Wesche, Karsten (2013): Tibet Plateau Atmosphere-Ecology-Glaciology Cluster Joint Kobresia Ecosystem Experiment: Documentation of the 2nd Intensive Observation Period Summer 2012 in KEMA, Tibet. Arbeitsergebnisse, University of Bayreuth, Department of Micrometeorology, 54, 54 pp, hdl:10013/epic.43938.d002
Coverage:
Median Latitude: 31.274048 * Median Longitude: 92.110534 * South-bound Latitude: 31.272980 * West-bound Longitude: 92.109170 * North-bound Latitude: 31.274760 * East-bound Longitude: 92.111390
Date/Time Start: 2010-06-09T00:00:00 * Date/Time End: 2010-09-03T12:00:00
Comment:
This presented dataset of C pools and fluxes results from a field campaign conducted in 2010 on the Tibetan Plateau at Kema (31°16'27.82'' N, 92°6'37.29'' E) within the Naqu Prefecture. It was funded by the German Research Council (DFG) as part of the Priority Programme 1372 "Tibetan Plateau: Formation, Climate, Ecosystems" (TiP). Further information about the field campaign and study site can be found in Biermann et al. (2011) and Biermann et al. (2013).
The net ecosystem exchange (NEE) CO2 flux were measured with two eddy-covariance (EC) stations from July 9th till August 2nd. These measurements were conducted inside (EC-P, 31.27418° N, 92.11037° E) and outside (EC-G, 31.27298° N, 92.11036° E) of a livestock exclosure on a Kobresia pygmaea pasture in 2 m height. Additionally weather parameter like temperature, humidity, precipitation and solar radiation were measured next to the EC stations.
The NEE measurements have been gapfilled and partitioned into Gross Ecosystem Exchange (GEE) and Ecosystem Respiration (Reco) with a widely used model approach which is based on the Michaelis-Menton and the Loyd-Taylor equations (30min turbulent fluxes were calculated from the high frequency raw data with the well-tested software package TK3 (Department of Micrometeorology, University of Bayreuth). This internationally compared software includes all necessary data correction and calculated fluxes match up-to-date micrometeorological standards. It also provides a tool for the quality control of data following with a quality-flagging scheme, ranging from 1 to 9 (1-3 good data quality, 4-6 intermediate data quality, 7 & 8 poor data quality, 9 bad data quality).
Furthermore the dataset collection consists of data collected within a 13CO2 pulse labeling experiment, which was conducted on 1st of July 2010 with four replicates on the treatments; grazed (G) livestock grazing exclosure (P) and total grazing exclosure (U). The 13C was chased in the plant-soil-atmosphere system over a period of two months with increasing sampling intervals (0, 1, 4, 8, 15, 23, 29, 36, 48 and 64 days after the labeling). The distribution of the tracer (13C) found within the sampled pools; shoot, CO2 efflux, white roots, woody roots and SOC in 0-5 cm and 5-15 cm provides an overview of the allocation and the turnover of assimilated C.
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