Brüggemann, N.

Butterbach-Bahl, K.

Gasche, R.

Papen, H.

Willibald, G.

English

KITopen

IMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheWhat can we learn from long-term measurements of soil-atmosphere exchange of trace gases? –The Höglwald as a case studyNicolas Brüggemann, Rainer Gasche, Hans Papen, Georg Willibald, Klaus Butterbach-BahlKarlsruhe Research CentreInstitute for Meteorology and Climate ResearchAtmospheric Environmental Research (IMK-IFU)Garmisch-PartenkirchenGermanyIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheQuestions• Which time is necessary for a reliable quantification of treatmenteffects on soil GHG fluxes in forest ecosystems?• What is a realistic time frame for the calculation of responsefunctions?• How frequent are extreme events like strong freeze-thaw periods?• What is a suitable time resolution of trace gas flux measurementsfor the evaluation of relationships between different gas fluxes orbetween gas fluxes and driving variables?IMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheHöglwaldLocation of the different experimental sites in the HöglwaldExperimental site: HöglwaldSpruce controlSelective cutting 2000/2006Clear cut 2000IMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheJul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan0501001502003004005000481216202007Cutting   Spruce control Selective cutting ClearcutN2O emission [µg N m-2 h-1]20062005200420032002200120001999 Spruce control Selective cutting Clearcut Cumulative N2Oflux [kg N ha-1 ]    Effect of forest management on soil N2O fluxesIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheJul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan Jul Jan-50-25025-16-12-8-40-16-12-8-402007   Spruce control Selective cutting ClearcutCH4 flux [µg CH4 m-2 h-1]20062005200420032002200120001999 Spruce control Selective cutting Clearcut Cumulative CH4flux [kg CH4 ha-1 ]    Effect of forest management on soil CH4 fluxesIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of Karlsruheyears after clearcut0 1 2 3 4 5 6 7 8normalized annual N2O emission (control = 1)01234567891011 Model: GiddingsChi2 = 0.268R2 =  0.990data point excluded fromregression analysis due to very wet summeryears after clearcut0 1 2 3 4 5 6 7 8normalized annual CH4 uptake (control = 1)0.00.20.40.60.81.01.21.4N2O CH4 Model: GaussModChi2 = 0.001R2 =  0.996data point excluded fromregression analysis due to extreme freeze-thaw eventResponse functions for soil N2O and CH4 fluxes after clearcutIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of Karlsruhe19941995199619971998199920002001200220032004200520060.00.51.01.52.02.53.03.5n.d.   Annual N2O flux [kg N ha-1  yr-1] non-freeze/thaw fluxes freeze/thaw fluxesn.d.Importance of freezing/thawingevents for the annual N2O budget82.9200625.520055.0200449.120032.820028.220013.2200060.2199782.319964.419955.71994%yearIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheDependency of soil N2O and NO fluxes on soil temperature and moisturesoil temperature 5 cm (°C)0 2 4 6 8 10 12 14 16 18N2O emission (µg N m-2 h-1)-10010203040WFPS (%)20 25 30 35 40N2O emission (µg N m-2 h-1)-10010203040N2OiNO emission (µg m-2 h-1)-10010020030040050060070NO emission (µg m-2 h-1)001002003004005006007 0NOIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of Karlsruhesoil temperature 5 cm (°C)0 2 4 6 8 10 12 14 16WFPS (%)20222426283032343638 5 10 15 20 25 N2O fluxessoil temperature 5 cm (°C)0 2 4 6 8 10 12 14 16WFPS (%)20222426283032343638 -35 -30 -25 -20 -15 CH4 fluxesDependency of soil N2O and CH4 fluxes on soil temperature and moistureIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of Karlsruhesoil temperature 5 cm (°C)0 2 4 6 8 10 12 14 16WFPS (%)20222426283032343638 0 50 100 150 NO fluxessoil temperatur 5 cm (°C)0 2 4 6 8 10 12 14WFPS (%)20222426283032343638 4 6 8 10 12 14 16 18 20 NO:N2O ratioDependency of soil NO fluxes and NO:N2O ratios on soil temperature and moistureIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheN2O emission (µg N m-2 h-1)0 5 10 15 20 25 30NO emission (µg N m-2 h-1)0100200300400NO = 10.39*N2O-13.80r ² = 0.71P < 0.0001Relationship between N2O and NO fluxesData from Jan-Jun 2008IMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheN2O emission (µg m-2 h-1)-10 0 10 20 30 40NO emission (µg m-2 h-1)-1000100200300400500600700NO = 5.90*N2O+47.06r ² = 0.11P < 0.0001Relationship between N2O and NO fluxesData from Jul 2006-Jun 2008All data pairsNO emission (µg m-2 h-1)05 55 1507Four per dayNO emission (µg m-2 h-1)4 7 2 78= 12One r NO emission (µg m-2 h-1)0100  .42 2 9.42r ²  . 9  . 229One p r week/ 2 weeksNO emission (µg m-2 h-1)8 139 0monthIMK-IFU Garmisch-PartenkirchenDr. Nicolas Brüggemann | IMK-IFU | 27.01.2009 NitroEurope GAKIT – a Cooperation betweenKarlsruhe Research Centerand University of KarlsruheConclusions• Reliable quantification of treatment effects on soil GHG fluxes in forest ecosystems needs >10 yrs of measurements• Calculation of response fuctions is only possible after several yearsof continuous measurements• Detection of the effect and frequency of extreme events also requires long-term measurements of several years• However, soil trace gas flux measurements do not necessarilyhave to be conducted with a daily or even sub-daily time resolutionMeasure less often, but longer!

What can we learn from long-term measurements of soil-atmosphere exchange of trace gases? The Höglwald as a case study

https://publikationen.bibliothek.kit.edu/230075303/3815448

What can we learn from long-term measurements of soil-atmosphere exchange of trace gases? The Höglwald as a case study

Abstract

Similar works

Full text

Available Versions

KITopen