LONGO maria silvana
Effects of ﬁre on arbuscular mycorrhizal fungi in the Mountain Chaco Forest
LONGO, MARÍA SILVANA; NOUHRA, EDUARDO; GOTO, BRUNO; BERBARA, RICARDO
FOREST ECOLOGY AND MANAGEMENT
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2014 vol. 315 p. 86 - 94
The aim of this study was to evaluate the ﬁre effects on the AMF spore communities and soil chemical properties as well as the existence of possible correlations between them in the Chaco Serrano Forests of central Argentina. Our hypothesis is that the ﬁre has a negative impact on the community of AMF spores (i.e. density, diversity, richness and evenness) and soil chemical properties. In addition, we expect to ﬁnd a high correlation between changes in the communities of fungi and soil chemical properties. We selected ﬁve areas in the ??Sierras Pampeanas?? mountain ranges within the Chaquean region in central Argentina. In each of them we selected adjacent burned and unburned forest sites. Burned sites have all the same time since ﬁre occurrence (August?November 2009) and soil samples were collected in autumn (April) and spring (November) in 2010. The ﬁre events had direct negative effects on AMF spore communities. Evenness, and notably diversity and richness of AMF spores decreased in the burned sites. Density of AMF spores was not affected by ﬁre. With the exception of C:N, nitrate and electrical conduc- tivity, soil parameters showed signiﬁcant differences between burned and unburned sites. The changes in AMF spore composition were not signiﬁcantly correlated with most of the soil variables measured here. The results of this study suggest that ﬁre occurrence negatively affect AMF communities. These effects do not seem to be mediated by changes in soil abiotic properties. Rather, they suggest direct effects of ﬁre on soil fungi.