Aurela, M.

Brueggemann, N.

Butterbach-Bahl, K.

Kieloaho, A.J.

Kiese, R.

Laurila, T.

Mammarella, I.

Minkkinen, K.

Penttilä, T.

Pihlatie, M.

Schoenborn, J.

Vesala, T.

English

Kieloaho, A. J.

KITopen

Quantification of C and N trace gas fluxes  from a drained peatland forest in Finland using different measuring techniquesR. Kiese, T. Vesala, M. Pihlatie, I. Mammarella, A.-J. Kieloaho, T. Laurila, M. Aurela, K. Minkkinen, T. Penttilä, J. Schoenborn, Annalea Lohila, N. Brueggemann, K. Butterbach-Bahl Contact information: Ralf.Kiese@imk.fzk.de14 Apr 21 Apr 28 Apr 5 Mai 12 Mai 19 Mai 26 Mai 2 Jun 9 Jun 16 Jun 23 Jun04812162024-44-40-36-32-28-24-2002468101214-5051015202530-505101520253035     Precipitation [mm day-1]Soil moisture [vol %]groundwater level (cm b. surface)Airtemperatur [°C] Litter [°C] 5cm [°C] 15cm [°C]  Soiltemperatur [°C] Location 60°38’N  24°21’E Height above sea level (m) 130 Mean annual precipitation (mm) 606 Mean annual temperature (°C) 4.3 Soil type drained peatland (1969) drainage distance 35m  Soil parent material granite/ gneis Vegetation (volume m3) Pinus Silvestris     111.15 Picea Abies               0.28 Betula                       4.46 Slope  flat pH ± SE  5.0 Bulk density 0-5 cm (g cm-3)d 0.3 Soil C content (%) 49.16 Soil N content (%) 1.13 C-to-N ratio 43.5 Soil NO3-N conc. (mg l-1) <10 Soil NH4-N conc. (m l-1) 3-5  Site location Site characteristics Climatic conditions 04-06 2007Measuring equipment:Automatic chamber measurements• Valve driven automatic sampling system, (IMK-IFU)• 9 Measuring chambers (50x50x15cm), (IMK-IFU)• Gaschrmomatograph equipped with 63Ni ECD for N2 O, (SRI)• GMD20D Infrared analyzer for CO2 , (Vaisala)EC flux measurements • CSAT3 Sonic Anemometer, (Campbell Sc.)• Li-7500 Open-Path Infrared CO2 /H2 O Gas Analyzer, (Li-Cor Inc.)• TDL-TGA100A for N2 O, (Campbell Sc.)Background:• 30% of Finnish timber production occurs on drained peatlands• drainage of peatlands results in lowering of groundwater table (app. 40cm)     and, thus, in a dramatic change of soil environmental conditions (e.g. soil water, aeration) with impacts on C and N turnover and associated GHG exchangeHypothesis:• drained peatland forests are high emitters of N2 O• N2 O makes up an important part of the ecosystem GHG exchange• N2 O fluxes measured by EC in the interstem section should be     comparable to the N2 O fluxes measured by closed chamber method 10 Apr 24 Apr 8 Mai 22 Mai 5 Jun 19 Jun 3 Jul020406080100 EC below canopy auto chambers   mean daily CO2-emission [mg C m-2 h-1]10 Apr 24 Apr 8 Mai 22 Mai 5 Jun 19 Jun 3 Jul05101520  detection limit TDL-EC  auto chambers   manual chambers   mean daily N2O emission [µg N m-2 h-1]10 Apr 24 Apr 8 Mai 22 Mai 5 Jun 19 Jun 3 Jul-60-40-20020406080100 auto chambers  manual chambers  TDL-EC (rainy days) TDL-EC (sunny days)  N2O emission [µg N m-2 h-1]Conlcusions:• The drained peatland forest (app. after  40 years of drainage impact) was not a high source of N2 O, but frost thaw-event driven N2 O emissions can  contribute to annual fluxes. • At current stage N2 O is an insignificant component of the total GHG budget of this site and CO2 is the main controlling component. However, this might  be different by regarding a full cycle from drainage to first harvest of timber.• Due to the combination of low N2 O emission levels and insufficient turbulent conditions EC-TDL based N2 O emission measurements are highly uncertain. However,  EC based CO2 emissions compared better with chamber based measurements0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40050100150200250300  frequencyfriciton velocity u*N2 O emissions with different measuring techniques Chamber N2 O emissions and detection limit of TDL-EC CO2 emissions with different measuring techniques

Quantification of C and N trace gas fluxes from a drained peatland forest in Finland using different measuring techniques

https://publikationen.bibliothek.kit.edu/220072276/3815256

Quantification of C and N trace gas fluxes from a drained peatland forest in Finland using different measuring techniques

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