title: Impact of summer drought on isoprenoid emissions and carbon sink of three Scots pine provenances.
abstract: Scots pine (Pinus sylvestris L.) provenances cover broad ecological amplitudes. In a greenhouse study, we investigated the impact of drought stress and rewetting on gas exchange for three provenances (Italy: Emilia Romagna; Spain: Alto Ebro; Germany: East-German lowlands) of 2-year old Scots pine seedlings. CO2, water vapour and isoprenoid exchange of stressed and control trees were quantified with a four-chamber dynamic-enclosure system in the controlled environment of a climate chamber. The three provenances showed distinct isoprenoid emission patterns and were classified into a non-Δ3-carene, with either high α-/β-pinene or β-myrcene fraction, and a Δ3-carene dominated type. Isoprenoid emission rates, net-photosynthesis and transpiration were reduced during summer drought stress and significantly recovered after rewetting. A seasonal increase of isoprenoid emission rates towards autumn was observed for all control groups. Compared with the German provenance, the Spanish and Italian provenances revealed higher isoprenoid emission rates and more plastic responses to drought stress and seasonal development, which points to a local adaptation to climate. As a result of drought, net carbon uptake and transpiration of trees was reduced, but recovered after rewetting. We conclude from our study that Scots pine isoprenoid emission is more variable than expected and sensitive to drought periods, likely impacting regional air chemistry. Thus, a provenance-specific emission assessment accounting for reduced emission during prolonged (summer) drought is recommend for setting up biogenic volatile organic compound emission inventories used in air quality models.
authors: Ecoclimatology, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany luepke@wzw.tum.de.
authors: M
authors: M
authors: Lüpke
authors: Ecoclimatology, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany.|Institute for Advanced Study, Technische Universität München, Lichtenbergstraße 2a, 85748 Garching, Germany.|Springer Science+Business Media B.V. , Van Godewijckstraat 30, 3311 GX Dordrecht, The Netherlands.
authors: M
authors: M
authors: Leuchner
authors: Karlsruhe Institute of Technology KIT, Institute of Meteorology and Climate Research Atmospheric Environmental Research (IMK-IFU) , Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany.
authors: R
authors: R
authors: Steinbrecher
authors: Ecoclimatology, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany.|Institute for Advanced Study, Technische Universität München, Lichtenbergstraße 2a, 85748 Garching, Germany.
authors: A
authors: A
authors: Menzel
mesh_terms: D000064:Acclimatization; D057965:Carbon Sequestration; D057231:Climate Change; D055864:Droughts; D005858:Germany; D007558:Italy; D041605:Pinus sylvestris / Q000254:growth & development / Q000378:metabolism*; D012621:Seasons; D013030:Spain; D013312:Stress, Physiological; D013729:Terpenes / Q000378:metabolism*; D014197:Trees / Q000254:growth & development / Q000378:metabolism*
chemical_list: D013729:Terpenes
keywords: BVOC; Scots pine; chemotypes; drought stress; provenances