Journal
PLANT CELL AND ENVIRONMENT
Volume 41, Issue 12, Pages 2899-2914Publisher
WILEY
DOI: 10.1111/pce.13424
Keywords
Fagus sylvatica; light attenuation; long-term trend; Picea abies; stable isotope; stand dynamics; tree ring
Categories
Funding
- SNF [136295]
Ask authors/readers for more resources
Stable isotope ratios in tree rings have become an important proxy for palaeoclimatology, particularly in temperate regions. Yet temperate forests are often characterized by heterogeneous stand structures, and the effects of stand dynamics on carbon (delta C-13) and oxygen isotope ratios (delta O-18) in tree rings are not well explored. In this study, we investigated long-term trends and offsets in delta O-18 and delta C-13 of Picea abies and Fagus sylvatica in relation to tree age, size, and distance to the upper canopy at seven temperate sites across Europe. We observed strong positive trends in delta C-13 that are best explained by the reconstructed dynamics of individual trees below the upper canopy, highlighting the influence of light attenuation on delta C-13 in shade-tolerant species. We also detected positive trends in delta O-18 with increasing tree size. However, the observed slopes are less steep and consistent between trees of different ages and thus can be more easily addressed. We recommend restricting the use of delta C-13 to years when trees are in a dominant canopy position to infer long-term climate signals in delta C-13 when relying on material from shade-tolerant species, such as beech and spruce. For such species, delta O-18 should be in principle the superior proxy for climate reconstructions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available