English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Bohemian Forest Mts. (Sumava) were exposed to heavy atmospheric pollution in the last century. A possible negative effect of atmospheric pollution on tree physiology has been studied using the isotopic composition, Δ 13 C, of tree rings. The wood is depleted of 13 C relative to the air due to isotopic discrimination against 13 C and preferred uptake of 12 C during photosynthesis. The ratio 13 C/ 12 C (Δ 13 C) reflects the relative magnitudes of net assimilation and stomatal conductance that relate to demand and supply of CO 2 . Carbon-13 data are thus a useful index for assessing intrinsic water use efficiency (mark period of drought or root system damages) and also could indicate assimilation organ injure (needle damage caused due to acid rain etc.). A decrease in Δ 13 C implies a negative effect of environmental condi - tions on tree physiology. Presumably, changes in soil pH and aluminium content as an indirect effect of atmospheric pollution could have an impact on tree physiology. Our results showed that the isotopic signal varied around the aver - age, but the Δ 13 C signal was decreasing from the 1950s to 1980s and then increasing again starting in the 1990s. This

Can <sup>13</sup>C stable isotope record of Norway spruce tree rings display the effect of environmental conditions?