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Biennial GHG budget of a riparian forest: From soil and tree-stem to ecosystem level
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SYSNO ASEP 0518441 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Biennial GHG budget of a riparian forest: From soil and tree-stem to ecosystem level Tvůrce(i) Mander, Ü. (EE)
Schindler, T. (DE)
Krasnova, A. (EE)
Macháčová, Kateřina (UEK-B) RID, ORCID, SAI
Pärn, J. (EE)
Soosaar, K. (EE)Zdroj.dok. AGU Fall Meeting. - Washington : American Geophysical Union, 2019 Poč.str. 1 s. Akce AGU Fall Meeting 2019 Datum konání 09.12.2019 - 13.12.2019 Místo konání San Francisco Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova methane ; nitrous oxide ; carbon dioxide ; ch4 ; n2o ; co2 ; nitrogen ; carbon ; emitter ; source ; sink ; greenhouse gas budget ; riparian alder forest ; tree stems ; soil ; canopy ; chamber ; eddy covariance ; losses Vědní obor RIV GK - Lesnictví Obor OECD Forestry Institucionální podpora UEK-B - RVO:86652079 Anotace Riparian forests sequester carbon dioxide (CO2 ) but little is known about the methane (CH4 ) and nitrous oxide (N2O) balance in the forests. Trees themselves can emit CH4 and the vegetation can be a significant CH4 source. Few studies show that drained nitrogen-rich organic soils under deciduous forests can be significant N2O sources. Grey alder (Alnus incana) is a fast-growing tree with potential for short rotation forestry. Grey alder stands are considered as accumulators of carbon (C). Their symbiotic dinitrogen fixation ability makes alders important regulators of the nitrogen (N) cycle. From July 2017 to July 2019 we measured budgets of CO2, CH4 and N2O of a 40-yr old riparian grey alder forest stand in Estonia using continuous measurements from the soil surface, samples from tree-stem chambers and continuous whole-ecosystem measurements (eddy covariance technique). Water level and soil temperature and moisture were measured automatically, and composite soil samples were taken for physico-chemical analysis. In the wet periods, stem flux of CH4 was the main source for ecosystem exchange, whereas in the dry periods, unexpectedly, ecosystem flux was significantly higher than fluxes from soil and tree stems. Most likely, canopy was the main CH4 emitter. N2O fluxes from the soil and stems were low during the dry periods and peaked during the wet periods and the freezing-thawing. The forest was a net annual source of both CH4 and N2O (6.33±0.29 kg CH4 ha-1 and 3.42±0.12 kg N2O ha-1, mean±SE) and a net annual sink of CO2 (-21,025±158 kg CO2 ha-1). Estimated average annual losses of total organic C and total N in groundwater were 7.5 kg C ha-1 and 1.8 kg N ha-1, thus the forest was a net annual C sink (-5,224 kg C ha-1). The total GHG budget shows that grey alder forests as pioneer communities, regardless of the CH4 fluxes, sequester large amounts C and improve soil-nutrient conditions. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2020
Počet záznamů: 1