The Bohemian Forest was exposed to high levels of sulfur and nitrogen deposition during the last century. The change in acid deposition caused a rapid decline in pH and increase in Al concentrations of soil solutions since the 1950s. A possible negative effect of soil chemistry on growth of Norway spruce tree has been studied using the 13C isotopic signal and chemistry of the tree rings. Tree rings were sectioned by decades, and whole wood was analyzed for isotopic composition (delta 13C) and content of Mg, Ca, and Al. Only those rings that formed after the juvenile effect in early rings were used and trends from the beginning of 20th century were evaluated. The mean delta 13C of the spruce tree rings was 17.6%. The delta 13C did not follow climate changes but had an opposite trend to that of acid depositions and Al concentrations in soil solution, but a similar trend as soil acidification (pH decrease), implying a negative effect of acid deposition and soil acidification on tree physiology. The molar ratio of base cations to Al decreased together with delta 13C.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/es070011t | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comprehensive analysis of the multi-rings mitochondrial genome of Populus tomentosa.
BMC Genomics
January 2025
State Key Laboratory of Tree Genetics and Breeding, National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China.
Background: Populus tomentosa, known as Chinese white poplar, is indigenous and distributed across large areas of China, where it plays multiple important roles in forestry, agriculture, conservation, and urban horticulture. However, limited accessibility to the mitochondrial (mt) genome of P. tomentosa impedes phylogenetic and population genetic analyses and restricts functional gene research in Salicaceae family.
View Article and Find Full Text PDFSuperellipse Equation Describing the Geometries of Tree Rings.
Plants (Basel)
December 2024
Co-Innovation Center of Sustainable Forestry in Southern China, College of Forestry and Grassland, Nanjing Forestry University, Nanjing 210037, China.
Our previous study using 41 tree rings of one Mill. disc indicated that the superellipse equation can accurately fit its tree-ring shape. This study further used the superellipse equation (xan+yβn=1 ) to model the geometries of 1090 tree rings of discs collected from five sites in Denmark.
View Article and Find Full Text PDFTracing ancient solar cycles with tree rings and radiocarbon in the first millennium BCE.
Nat Commun
January 2025
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern Weg 5 HPK, 8093, Zurich, Switzerland.
The Sun drives Earth's energy systems, influencing weather, ocean currents, and agricultural productivity. Understanding solar variability is critical, but direct observations are limited to 400 years of sunspot records. To extend this timeline, cosmic ray-produced radionuclides like C in tree-rings provide invaluable insights.
View Article and Find Full Text PDFAuxin promotes chloroplast division by increasing the expression of chloroplast division genes.
Plant Cell Rep
December 2024
State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China.
Auxin stimulates chloroplast division by upregulating the expression of genes involved in chloroplast division and influencing the positioning of chloroplast division rings. Chloroplasts divide by binary fission, forming a ring complex at the division site. Auxin, particularly indole acetic acid (IAA), significantly influences various aspects of plant growth.
View Article and Find Full Text PDFDecades-old carbon reserves are widespread among tree species, constrained only by sapwood longevity.
New Phytol
December 2024
Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA.
Article Synopsis
- Carbon reserves in trees are influenced by past photosynthesis and can be dated using radiocarbon dating, allowing researchers to study their distribution and turnover.
- A new process model was created to analyze how different tree species manage their carbon reserves, revealing that both young and old reserves coexist within a single tree and are significantly mixed.
- Disturbances like drought, fire, and pests negatively affect reserve mixing and longevity, with older reserves showing notable age shifts after disturbances, suggesting that ecological variations across species play a critical role in reserve management.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!