Une plus grande biodiversité permet aux forêts de mieux résister aux effets du changement climatique et de continuer à assurer les mêmes services, notamment le recyclage du carbone et des nutriments, selon deux études publiées lundi.
"Quand il y a plus de biodiversité, on peut maintenir un même fonctionnement de l'écosystème malgré des conditions climatiques plus extrêmes.
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L'info en continu https://buzzplus.fr/
Infos, news & actualités - L'information internationale en direct.
"Quand il y a plus de biodiversité, on peut maintenir un même fonctionnement de l'écosystème malgré des conditions climatiques plus extrêmes.
-
L'info en continu https://buzzplus.fr/
Infos, news & actualités - L'information internationale en direct.
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NewsTranscript
00:00 "A greater biodiversity allows forests to better resist the effects of climate change
00:04 and to continue to provide the same services,
00:06 including carbon and nutrient recycling, according to two studies published on Monday.
00:11 When there is more biodiversity,
00:13 we can maintain the same ecosystem despite more extreme climate conditions.
00:18 By promoting a stronger biodiversity,
00:21 we can mitigate the consequences of climate change",
00:24 summarises FP Stéphane Atenchevillère, Research Director at CNRS, who participated in the two studies.
00:30 The first, published in the Global Review of Biological Change by researchers based in Germany and France,
00:36 shows by way of modelling that the plant diversity of a forest or a meadow
00:40 protects it from extreme temperatures,
00:42 thus favouring ecosystemic processes such as decomposition.
00:46 The soil can therefore continue to play its role as a carbon well.
00:51 The decomposition of dead parts of plants, such as leaves that fall in autumn,
00:55 is in fact fueling carbon and nitrogen cycles,
00:59 an essential process for the proper functioning of ecosystems
01:02 and for the natural storage of carbon in the soil.
01:04 The second study, published in the PNAS magazine by scientists based in China and France,
01:10 is for this purpose experimental.
01:11 They observed the effects of different blends of dead leaves and decomposing organisms
01:16 in different types of forests, subjected to conditions of drought.
01:20 These normally tend to slow down decomposition.
01:23 But the study showed that biodiversity has the potential to compensate for the negative effects of drought,
01:29 underlines Stéphane Atenchevillère.
01:31 The normal process of decomposition and recycling of elements
01:35 has in fact been maintained by increasing the diversity of plants
01:38 and the complexity of the communities of decomposers, insects, millepaths, acarians etc.,
01:43 despite a negative impact of drought.
01:47 These discoveries suggest that promoting biodiversity is an important lever
01:51 to maintain the essential functions of ecosystems with the current climate change,
01:55 conclude the authors in the study.
01:57 "Instead of promoting monocultures, we must do everything to make our forests more diverse",
02:02 adds Stéphane Atenchevillère.
02:04 "It would be a mistake to go fast and plant monocultures
02:07 to increase carbon storage on a large surface", he adds.
02:11 In France, forest carbon wells work less well than anticipated.
02:17 The State has decided to plant a billion trees of diversified fuel
02:20 adapted to the future climate over a decade.