TY - JOUR

T1 - Long-term trends in tree-ring width and isotope signatures (δ13C, δ15N) of Fagus sylvatica L. on soils with contrasting water supply

AU - Härdtle, Werner

AU - Niemeyer, Thomas

AU - Aßmann, Thorsten

AU - Baiboks, Saskia

AU - Fichtner, Andreas

AU - Friedrich, Uta

AU - Lang, Anne Christina

AU - Neuwirth, Burkhard

AU - Pfister, Laurent

AU - Ries, Christian

AU - Schuldt, Andreas

AU - Simon, Natalie

AU - Oheimb, Goddert

PY - 2013/12

Y1 - 2013/12

N2 - We investigated long-term responses (since 1850) of Fagus sylvatica (Luxembourg; central Europe) to shifts in temperature, precipitation, and nitrogen deposition by analyzing diameter at breast height (DBH) increment, basal area increment (BAI), and tree-ring stable isotopes (δ13C, δ15N). We compared stands on soils with contrasting water supply (Regosols and Cambisols with an available water capacity of ca. 40 and 170 mm, respectively) and of two different age classes (ca. 60 vs. 200 years). All stands showed a peak in DBH increment in the decade 1978–1987, but a decline in increment growth in subsequent decades. In addition, BAI declined in mature stands in the last two decades. Decreasing increment rates were attributable to an increasing drought limitation of stands, mainly induced by increasing temperatures in the last two decades. Contrary to our expectations, stands on Cambisols showed a similar susceptibility to shifts in temperature and precipitation as stands on Regosols, suggesting a strong adaptation of the respective ecotypes grown at dryer sites. This result was in line with long-term trends for tree-ring δ13C signatures, which did not differ significantly between stands on Cambisols and Regosols. Climate impacts on tree-ring δ15N signatures were low. High spring precipitation and temperatures caused increasing and decreasing δ15N values, respectively, but only in mature stands on Cambisols. Stands on Regosols tended to have lower δ15N values than stands on Cambisols. Decreasing δ15N values in recent decades suggest an increasing impact of allochthonous N loads with isotopically lighter N.

AB - We investigated long-term responses (since 1850) of Fagus sylvatica (Luxembourg; central Europe) to shifts in temperature, precipitation, and nitrogen deposition by analyzing diameter at breast height (DBH) increment, basal area increment (BAI), and tree-ring stable isotopes (δ13C, δ15N). We compared stands on soils with contrasting water supply (Regosols and Cambisols with an available water capacity of ca. 40 and 170 mm, respectively) and of two different age classes (ca. 60 vs. 200 years). All stands showed a peak in DBH increment in the decade 1978–1987, but a decline in increment growth in subsequent decades. In addition, BAI declined in mature stands in the last two decades. Decreasing increment rates were attributable to an increasing drought limitation of stands, mainly induced by increasing temperatures in the last two decades. Contrary to our expectations, stands on Cambisols showed a similar susceptibility to shifts in temperature and precipitation as stands on Regosols, suggesting a strong adaptation of the respective ecotypes grown at dryer sites. This result was in line with long-term trends for tree-ring δ13C signatures, which did not differ significantly between stands on Cambisols and Regosols. Climate impacts on tree-ring δ15N signatures were low. High spring precipitation and temperatures caused increasing and decreasing δ15N values, respectively, but only in mature stands on Cambisols. Stands on Regosols tended to have lower δ15N values than stands on Cambisols. Decreasing δ15N values in recent decades suggest an increasing impact of allochthonous N loads with isotopically lighter N.

KW - Biology

KW - basal area increment

KW - climate change

KW - dendrochemistry

KW - dendroecology

KW - drought limitation

KW - Luxemburg

KW - nitrogen deposition

KW - Ecosystems Research

UR - http://www.scopus.com/inward/record.url?scp=84888004332&partnerID=8YFLogxK

U2 - 10.1007/s10021-013-9692-x

DO - 10.1007/s10021-013-9692-x

M3 - Journal articles

VL - 16

SP - 1413

EP - 1428

JO - Ecosystems

JF - Ecosystems

SN - 1432-9840

IS - 8

ER -