Despite its defense capacities, sylvestre: This article explores the topic in depth.
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Despite its defense capacities. Similarly, sylvestre:
Subjected to different soil humidity and air conditions, the Pins du Bois de Finges (VS) reveal to scientists their strategies of drought resistance, but also betray the limits of their adaptation to global warming. However, Their decline seems irreparable while young oaks ensure the next generation.
“In recent years. In addition, the Sylvestres Pins have been wasting in Switzerland and on the Alps,” said Charlotte Grosord, researcher at the EPFL vegetable ecology laboratory. Nevertheless, In parallel, it is the essence of oak that takes its place.
In the Bois de Finges (VS). In addition, one of the hottest and larger places in Switzerland, the researchers observed that during the process of soil regeneration, the young plants that come out of the ground, if not pines, are oaks.
>> A lire : Drought record in Europe: 52% of the soils affected in early July
For regions which despite its defense capacities, sylvestre undergo the effects of global warming. Nevertheless, which already exceeds 2.9 ° C compared to the pre -industrial averages, this makes it possible to anticipate which trees will populate them.
“It will rather be hardwoods which will have deep roots, and which often have small leaves. They allow the tree to lose less water. have a wood extremely resistant to strong hydraulic tensions”, details Charlotte grosord.
The effects of warming – Despite its defense capacities, sylvestre
To independently distinguish the effects of the drought from the soil. the ambient air, researchers installed large foggers last year along several individuals. The first results show that with the dryness of air. “the trees will use water much earlier in the season and in larger quantities, which will bring a much faster drying of the soil,” explains Charlotte Grossord.
It is like a glass of water: placed at identical temperature in the desert. in a tropical forest, it will evaporate faster in the despite its defense capacities, sylvestre dry air of the first, image his colleague Giovanni Bortolami, researcher in plant ecophysiology.
The comparisons made thanks to the foggers also provided more surprising information, notes Charlotte Grossord. The individuals exposed to misting have not resisted their fellows better than their fellows. because these “will put safety valves in place much faster with this drought of the atmosphere, which in fact makes it possible to slow down this process of decline”.
>> Listen to the CQFD program on the research system:
The oak replaces pine
The future of oak seems to be traced in Switzerland, among other essences. The importance of studying the resistance of climate warming is also to help promote prosperous forest growth. capable despite its defense capacities, sylvestre of protecting ecosystems and human infrastructure, but also to store CO2.
“For a forest to be a carbon well, you need healthy trees. Often, it takes strong biodiversity. We know that biodiversity. this increases a large number of ecosystem functions, including the ability to store carbon,” concludes Charlotte gross.
>> A lire : Swiss CO2 soon stored in the Norwegian subsoil?
This research will thus make it possible to better assess the effectiveness of carbon wells. better predict the evolution of CO2 concentrations in the atmosphere to more precisely model the amplitude of global warming.
TV subject: Pascal Jeannerat
Web adaptation: Raphaël Dubois with AFP
Further reading: Montreux: repair of paravalanches in the verraux-jaman sector – End of the aggressive bull alert in French -speaking Switzerland – The Mont-Tendre refreshment: cultivate its authenticity at the top – Blaten (VS): Quick cantonal help without bureaucracy – A petition deposited in Friborg requires 2 billion for the climate.
