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  Impact of afforestation-associated management changes on the carbon balance of grassland

Don, A., Rebmann, C., Kolle, O., Scherer-Lorenzen, M., & Schulze, E. D. (2009). Impact of afforestation-associated management changes on the carbon balance of grassland. Global Change Biology, 15(8), 1990-2002.

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BGC1239.pdf (Verlagsversion), 425KB
 
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 Urheber:
Don, A.1, Autor           
Rebmann, C.1, Autor           
Kolle, O.2, Autor           
Scherer-Lorenzen, M.1, Autor           
Schulze, E. D.1, Autor           
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              
2Service Facility Field Measurements & Instrumentation, O. Kolle, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497769              

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Schlagwörter: Afforestation Carbon fluxes Eddy covariance Grassland management Land use change Net biome production Net primary production Soil organic carbon Soil respiration Eddy covariance measurements Net ecosystem exchange Soil carbon Temperate grassland Tallgrass prairie Organic-carbon Land-use Dioxide exchange Site preparation Arable land
 Zusammenfassung: Afforestations can be considerable carbon (C) sources due to C losses from the soil after site preparation for tree planting and decreased primary production. In this study, the transition from grassland to afforestation was investigated using two eddy flux towers, which were operated in parallel for 3 years, one on a young afforestation and one on an adjacent grassland. Differences between the fluxes at the two sites were attributable to the management of the sites, without confounding influences of meteorological variability. Site preparation with deep ploughing of the planting rows destroyed 30% of the grassland vegetation at the afforestation site and reduced gross primary productivity by 41% in the first year. At the afforestation site 38 g m(-2) less C was sequestered compared with the nonafforested grassland during the first year. In the following years, the C sink at the afforestation site was higher than at the grassland indicating that soil C loss due to site preparation and land use change on the afforestation occurred only during the first year. Metrological conditions, especially summer drought, caused a high interannual variability of the C balance: both sites were small C sources in 2005 (67 g C m(-2) a(-1) at the grassland and 19 g C g(-1) a(-1) at the afforestation site) and small C sinks in 2004 and 2006 (-72.5 and -16 g C m(-2) a(-1) at the grassland and -34 and -61 g C g(-1) a(-1) at the afforestation). Sheep grazing and mowing affected the short-term dynamics of the C balance and sheep grazing accelerated the C turnover on the grassland site. The investigated afforestation site did not provide any short-term way of sequestering additional C even though soil C losses during the first 3 years were relatively small. [References: 57]

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Sprache(n): eng - English
 Datum: 2009
 Publikationsstatus: Erschienen
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Titel: Global Change Biology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, UK : Blackwell Science
Seiten: - Band / Heft: 15 (8) Artikelnummer: - Start- / Endseite: 1990 - 2002 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925618107
ISSN: 1354-1013