Natural recovery from fire disturbance is more favorable than assisted recovery for the restoration of soil nematode-trapping fungi.

Citation metadata

From: Canadian Journal of Microbiology(Vol. 68, Issue 5)
Publisher: NRC Research Press
Document Type: Report
Length: 6,019 words
Lexile Measure: 1600L

Document controls

Main content

Abstract :

A fire is usually considered a severe disturbance factor in the environment. Globally, rising temperatures and increasing human activities have intensified the severity and frequency of fire incidents, and research on post-fire recovery has inevitably become an important focus for ecologists. In terms of the restoration of burned areas, there are usually two primary approaches: natural recovery and assisted recovery. However, very few relevant studies have systematically compared these recovery alternatives, suggesting which one is more favorable to the overall restoration of an ecosystem, especially to the soil microbes that function as indispensable components of ecosystems. In this study, the restoration of soil nematode-trapping fungi (NTF) in natural and assisted recovery environments was compared. The results showed that although the NTF community structures differed among the sample sites, the counts and diversity of the NTF communities in the upper and lower soil layers in the natural recovery area were higher than those in the assisted recovery and unburned control areas. These findings suggest that artificial efforts to help ecosystem recovery after fire negatively affect the speed and quality of soil NTF community recovery. Instead, natural recovery appears to be a more suitable land management choice after fire disturbance. Key words: soil ecosystem, fire, keystone taxa, assisted recovery, natural recovery. Le feu est generalement considere comme un facteur de perturbation severe de l'environnement. A l'echelle mondiale, l'augmentation des temperatures et l'accroissement des activites humaines ont intensifie la gravite et la frequence des incendies; la recherche sur le retablissement apres un incendie est inevitablement devenue un centre d'interet important pour les ecologistes. En termes de restauration des zones brulees, il existe generalement deux approches principales : le retablissement naturel et le retablissement assiste. Toutefois, il y a tres peu d'etudes pertinentes qui comparent systematiquement ces alternatives de retablissement en suggerant laquelle est la plus favorable a la restauration globale d'un ecosysteme, en particulier pour les microbes du sol qui agissent comme des composants indispensables des ecosystemes. Dans cette etude, les environnements de retablissement naturel et assiste ont ete compares en matiere de restauration des champignons piegeant les nematodes (NTF) dans le sol. Les resultats ont montre que, bien que les structures des communautes NTF differaient selon les sites d'echantillonnage, le nombre et la diversite des communautes NTF dans les couches de sol superieures et inferieures dans la zone de retablissement naturel etaient plus eleves que dans les zones de retablissement assiste et les zones temoins non brulees. Ces resultats suggerent que les efforts artificiels visant a favoriser le retablissement de l'ecosysteme apres un incendie ont des effets negatifs sur la vitesse et la qualite du retablissement des communautes de NTF du sol. Au contraire, le retablissement naturel semble etre le choix de gestion des terres le plus approprie apres une perturbation par le feu. [Traduit par la Redaction] Mots-cles: ecosysteme du sol, incendie, taxons cles, retablissement assiste, retablissement naturel.

Source Citation

Source Citation   

Gale Document Number: GALE|A703478109