GERMANY-WIDE COMPARISON OF

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1 GERMANY-WIDE COMPARISON OF SPATIAL DISTRIBUTION OF NITROGEN CONCENTRATIONS AND STABLE ISOTOPE SIGNATURES OF BRYOPHYTES AND LICHENS Boltersdorf SH, Pesch R, Schröder W, Werner W 26 th Task Force Meeting of the UNECE ICP Vegetation in Halmstad, Sweden 28 th -31 st January 213

2 INTRODUCTION isotope fractionation NH y : depleted in 15 N NO x : enriched in 15 N Hertel et al. 26

nitrogen budgets across Europe Emissions from agriculture in

3 INTRODUCTION NHN 2 O emission (kg N ha yr -1 3 emission (kg N ha -1 yr -1 ) ) Geographical variation in terrestrial nitrogen budgets across Europe Emissions from agriculture in the year 2 in EU-27. Calculation with INTEGRATOR. De Vries et al. 211

4 INTRODUCTION Europe Germany

INTRODUCTION Do lichens, mosses and bark react by increasing the N concentration in their tissue under currently increased N deposition rates and that this response

Do data obtained from lichen and moss monitoring correlate with data obtained from N monitoring networks based on physico-chemical measurements and with modelled

5 INTRODUCTION Do lichens, mosses and bark react by increasing the N concentration in their tissue under currently increased N deposition rates and that this response is species specific? Do data obtained from lichen and moss monitoring correlate with data obtained from N monitoring networks based on physico-chemical measurements and with modelled deposition data? Do δ 15 N values of lichen, moss and bark samples allow researchers to identify the main N source of deposition on a gradient of increased agricultural activities.? Different receptor surfaces exhibit different concentrations of N and δ 15 N signatures, despite being exposed to similar N deposition!

6 MATERIAL & METHODS Sylt Zingst Dunum Waldhof Neuglobsow Falkenberg 2 km Kleve Solling r = 3km Melpitz Deuselbach Schmuecke Lehnmuehle Regnitzlosau Baverian Forest Oehringen Raisting Sites of lichen & bark sampling 28 Standorte der Probenahme Field station for deposition measurement Forest and moss sampling sites 26/28 Freilandmessstation Beprobungsraum [ca. 28km²] 17 sites in Germany Schauinsland

7 MATERIAL & METHODS Overview of indicator species and sample sizes Lichens Mosses Bark Parmelia sulcata Xanthoria parietina Physcia sp. Hypnum cupressiforme Pleurozium schreberi Scleropodium purum Alder, apple tree, ash, birch, common oak, durmast oak, hazel, hornbeam, largeleaved lime, Norway maple, Norway spruce, pine, plum, poplar, service tree small-leaved lime, sweet cherry, sycamore maple, willow 346 lichen samples [28] 166 moss samples [28] 193 bark samples 17 moss samples [26] Elimination of foreign material Freeze-drying Pulverisation N content and δ 15 N anaylses at elemental-analyzer coupled with IRMS

8 Ratio of NH x /NO Y (bulk deposition) RESULTS 1 8 Series1 measured ratio NH y /NO x (UBA) Series3 modelled ratio NH y /NO x (Gauger et al. 28) Precipitation Overview of deposition data Series1 Series3 Series2 measured ratio NH y /NO x (UBA) modelled ratio NH y /NO x (Gauger et al. 28) Precipitation Precipitation (mm yr -1 ) 2 4

10 δ 15 N ( ) RESULTS Comparison between δ 15 N in moss and lichen species -2 Parmelia sulcata Xanthoria parietina Physcia sp Scleropodium purum Pleurozium schreberi Hypnum cupressiforme

11 δ 15 N ( ) N concentration (% DW) 5 RESULTS Overview of averaged data of lichen-, moss and bark samples at the respective site Lichen samples 28 Moss samples 28 Moss samples 26 Bark samples 28

12 δ 15 N( ) lichens, moss samples 26 and bark N (% DW) lichens, moss samples 26 and bark RESULTS 5 4 Lichen samples Moss samples Bark samples r lichens =.66* r mosses =.49* r bark =.21 Correlation between N% and δ 15 N ratios of moss samples 28 with lichen-, moss and bark samples at the respective sites N (% DW) moss samples 28 Lichen samples Moss samples Bark samples r lichens =.4 r mosses =.3 r bark = δ 15 N( ) moss samples 28-14

13 N (% DW) δ 15 N( ) RESULTS Correlation between N% and δ 15 N ratios of sampled lichen, moss and bark material and NH y /NO x ratio of deposition 5 4 Lichen samples Moss samples Bark samples Moss Samples r lichens =.2 r mosses 8 = -.69 r mosses 6 = -.18 r bark = r lichens =.4 r mosses 8 =.23 r mosses 6 =.4* r bark = NH y /NO x bulk deposition Lichen samples Moss samples Bark samples Moss samples NH y /NO x bulk deposition NH y /NO x bulk deposition NH y /NO x bulk deposition 26

14 N (% DW) δ 15 N( ) RESULTS Correlation between N% and δ 15 N ratios of sampled lichen, moss, bark material and modelled NH y /NO x ratios of deposition 5 4 Lichen samples Moss samples Bark samples Moss Samples r lichens =. r mosses 8 =.28 r mosses 6 = -.28 r bark = r lichens =.8** r mosses 8 =.61* r mosses 6 =.21 r bark = Modelled NH y /NO x bulk deposition Lichen samples Moss samples Bark samples Moss samples Modelled NH y /NO x bulk deposition Modelled NH y /NO x bulk deposition Modelled NH y /NO x bulk deposition 26

15 CONCLUSION The increase of agriculture-derived N impact into ecosystems can be detected by using the N content and isotopic abundance of lichens and mosses lichens will reflect both, dry and wet deposition Mosses reflect more the dry deposition Difficult task to compare mosses and lichens and the corresponding wet deposition data. The comparability of N deposition data with tissue N content is not guaranteed satisfactorily Species specific strong absorption and efficient incorporation of N -> powerful indicators for the accumulation of N, in real terms, as a consequence of increasing human intervention relating to N. In addition to this, the dispersal of nitrogenous air pollution over long distances plays an important role which has so far been strongly underestimated. It will also not picked up by temporarily installed deposition measurement devices.

16 LOOK OUT Comparison between N interpolations Integrating land use and livestock units Moss Monitoring N Lichen Monitoring N Field studies to detect the influences of NH 3 next to agricultural source hotpots Mohr 1999/Genssler 2

17 SPECIAL THANKS GO TO... German Federal Environmental Foundation Federal Environment Agency Dorothee Krieger and Bernhard Backes - University of Trier - Dept. of Geobotany Dr. Roland Pesch and Michaela Kluge University of Vechta Johannes Schultze, Dr. Michael Jeschke, Cornelia Boltersdorf and Tobias Wommelsdorf

18 Thanks for your attention!

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