Coniferous trees are widespread in Russia, especially in Siberia, where taiga extends over tens of millions of hectares. Cedars and pines grow also in the environs of cities and in city parks and suffer from human-induced changes in environment.
Of course, coniferous trees can withstand a low-level pollution. Acid gases or soil pollutants that trees absorb are actively transported and deposited in those parts of wood, which do not perform important functions, and some elements are removed with needles and root exudates. Trees are armed with several biochemical reactions preventing harmful oxidation processes. According to the data obtained in the Main Botanical Garden in Moscow, the ability of pine species to withstand the human-induced pollution decreases in the following range. Common pine (Pinus silvestris) is most sustainable; mountain pine (Pinus montana) and North American species - Labrador pine (Pinus banksiana) and Weymouth pine (Pinus strobus) - are less sustainable; cembra pine (Pinus cembra), Siberian cedar (Pinus sibirica), dwarf pine (Pinus pumila), and Korean pine (Pinus koraiensis) are most vulnerable.
Conifers are ten times as sensitive to the air pollution as foliage trees. Because of such a susceptibility to ecological changes, conifers are good objects for the biological monitoring of the environment. This method allows one to assess a combined impact of all toxic substances on live organisms. This is very advantageous in urban conditions, since the heterogeneity of the city climate, soil cover, topography, and other factors make it difficult to determine the degree of pollution and the level of toxicity of various substances in certain points within the town area. Such an assessment could not be based, e.g., only on the chemical analysis of gaseous pollutants, because the latter cannot characterize the transformation and migration of gases in different layers of the atmosphere. In this situation, the observation on plants that suffer from these gases is a better way of ecological control.
Natalia Reznik | alphagalileo
Dead trees are alive with fungi
10.01.2018 | Helmholtz Centre for Environmental Research (UFZ)
Management of mountain meadows influences resilience to climate extremes
10.01.2018 | Max-Planck-Institut für Biogeochemie
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
16.01.2018 | Materials Sciences
16.01.2018 | Materials Sciences
16.01.2018 | Power and Electrical Engineering