The effect of silvicultural management on the genetic diversity of a mixed Nothofagus forest in Lanín Natural Reserve, Argentina

Sola, Georgina; Mujtar, Verónica El; Tsuda, Yoshiaki; Vendramin, Giovanni G.; Gallo, Leonardo

doi:10.1016/j.foreco.2015.12.018

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…But can grow under different light regimes after episodes of bamboo dieback that provide the main opportunities for reestablishment of tall forest (Lusk 2001). Therefore, management of the stand light regime through silvicultural techniques is required to ensure better regeneration of this species (Sola et al 2016). In our study, N. dombeyi in an old-growth forest stand could reach more than 2 m in dbh and above 50 m in height.…”

Section: Introductionmentioning

confidence: 79%

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes

Encina¹,

Rodrı́guez²,

Müller-Using³

et al. 2019

Gayana Bot.

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Efectos de la radiación solar sobre los patrones de la regeneración, en un bosque sobremaduro de Nothofagus dombeyi (Mirb.) Oerst. localizado en el centro-sur de los Andes, Chile ABSTRACT Nothofagus species behave like early successional species that recolonize open sites after of regular and large-scale disturbances. This study analyzed the effects of light regimes on patterns of advanced regeneration dynamics, growth in diameter and height of Nothofagus dombeyi (Mirb.) Oerst. (Density of 240 trees ha -1 , basal area of 56.7 m 2 ha -1 ). Systematic sampling every 50 m in three stands (7.5 ha) was used. At each point and with the same center, two concentric circular plots were established, 9.0 m and 1.8 m radius. For estimate solar radiation transmissivity in plots, a solariscope hemispheric photographic camera was used. Diameters at breast height and basal areas (BA), heights (H) were measured and then counted and measured N. dombeyi seedlings and saplings. 13 saplings of advanced regeneration were harvested from all gaps to obtain age (E), total height (TH), absolute radial growth (ARG), and absolute height growth (AHG). As results, solar radiation varied between 3 and 40%. ARG varied between 1.20 and 2.22 mm yr -1 and AHG between 0.15 and 0.43 m yr -1 . We found correlation for ARG and AHG with direct and global solar radiation transmissivity, but not with diffuse solar radiation transmissivity. The plant age and transmittance of direct and global solar radiation explains the increases in diameter and height. However, in our study stated that in the Andean region of south-central Chile, N. dombeyi stands is affected by small-scale disturbances. Therefore, transmissivity radiation solar inside the forest, explaining natural regeneration patterns and growth of N. dombeyi. RESUMENLas especies de Nothofagus se comportan como especies sucesionales tempranas que recolonizan sitios abiertos después de disturbios regulares y de gran escala. Este estudio analizó los efectos de los regímenes de luz, en los patrones de dinámica de regeneración avanzada, crecimiento en diámetro y altura de Nothofagus dombeyi (Mirb.) Oerst. (Densidad de 240 árboles ha -1 , área basal de 56,7 m 2 ha -1 ). Se utilizó un muestreo sistemático cada 50 m en tres rodales (7,5 ha). En cada punto y con el mismo centro se establecieron dos parcelas circulares, 9,0 m y 1,8 m de radio. Se midió la transmisividad de la radiación solar con una cámara fotográfica hemisférica solariscope. Se midieron los diámetros a la altura del pecho, áreas basales (BA), alturas (H) y se contaron las plántulas y plantas de N. dombeyi. En los claros se cosecharon 13 plantas de la regeneración avanzada, para obtener la edad (E), la altura total (TH), el crecimiento radial absoluto (ARG) y el crecimiento absoluto en altura (AHG). La radiación solar varió entre 3 y 40%. ARG varió entre 1,20 y 2,22 mm año -1 y AHG entre 0,15 y 0,43 m año -1 . Se encontró correlación para ARG y AHG con transmisividad de radiación solar directa y global, pero no con transmisividad de radiación...

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Section: Introductionmentioning

confidence: 79%

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes

Encina¹,

Rodrı́guez²,

Müller-Using³

et al. 2019

Gayana Bot.

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“…A higher sample size was not required as genetic diversity of molecular makers from both species has been previously determined supporting the power of selected markers to discriminate both species (Manos 1997, El Mujtar et al 2014, Sola et al 2016. Samples representing putative parental species have homozygote genotypes for Adh isozyme alleles, N. obliqua Adh 1 -Adh 1 and N. alpina Adh 2 -Adh 2 and therefore they were also used to test species specificity of isozyme alleles.…”

Section: Methodsmentioning

confidence: 95%

“…In addition, 16 samples from Lácar watershed (Argentina) previously genotyped at ten out of these 12 SSRs were included in the analysis: eight natural hybrids between N. obliqua and N. alpina (NoxNa), four N. obliqua and four N. alpina individuals were selected based on their genotypes, with hybrids showing alleles from both species at more than one loci (Sola et al 2016). PCR reactions of SSRs developed from transcriptome 454 NGS (table 2) were carried out using a 1X Buffer with GoTaq DNA polymerase, containing a final concentration of 300 µM dNTPs, 3.0 mM of MgCl 2 , and 0.15 U µL -1 of GoTaq DNA polymerase (Promega, USA), as single or multiplex PCR (table 2).…”

Section: Methodsmentioning

confidence: 99%

Searching for molecular insight on hybridization in Nothofagus spp. forests at Lagunas de Epulauquen, Argentina

2016

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Estudio de la hibridación a nivel molecular en bosques de Nothofagus spp. Recently, however, its taxonomic status has been questioned due to its morphological, architectural and genetic distinctiveness. The convergence of migratory routes and hybridization with Nothofagus alpina are the two main hypotheses proposed to explain the distinctiveness of this population. Despite its unique characteristics, no evaluation of its putative origin has been carried out. In order to test the hypothesis of hybridization we analyzed nuclear Adh and ITS fragment sequences together with 12 nuclear microsatellites. These nuclear regions were selected based on their previously reported divergence between N. obliqua and N. alpina. The survey was conducted in 12 individuals from Lagunas de Epulauquen, and individuals from N. obliqua (8), N. alpina (1), N. macrocarpa (2), N. glauca (4) and N. leonii (2). By combining a phylogenetic analysis with a principal coordinate analysis of microsatellite data, we showed that Lagunas de Epulauquen individuals were closely related to other N. obliqua individuals, while hybridization with N. alpina was not detected. Our results indicate that hybridization processes could be discarded as the origin of the Lagunas de Epulauquen distinctiveness. The hypothesis of the convergence of two N. obliqua migratory routes at this latitude was reinforced based on detected patterns of genetic diversity. Notwithstanding, its high geographical isolation seems to be also a key evolutionary factor to explain the distinctiveness of this population. Lagunas de Epulauquen population could be therefore included within Argentinean N. obliqua domestication and conservation programs.

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“…Within these stands, artificial thinning did not maintain the original balanced composition, due to the lower competitive ability of N. alpina regeneration under the increased radiation of the forest floor. Immature trees of this species constituted the advance regeneration and exhibited the highest biomass in the shaded edges of gaps (Dezzotti, 2008;Sola et al, 2016).…”

Section: Dezzotti and Poncementioning

confidence: 99%

Early Development of Nothofagus (Nothofagaceae) Species From the Subantarctic Forest Under Experimental Conditions of Light, Substrate and Ecological Interaction

Dezzotti

Ponce

2018

CERNE

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EARLY DEVELOPMENT OF Nothofagus (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION DEZZOTTI, A.; PONCE, O. Early development of Nothofagus (NOTHOFAGACEAE) species from the subantarctic forest under experimental conditions of light, substrate and ecological interaction. CERNE, v. 24, n. 2, p. 149-161, 2018. HIGHLIGHTS In Nothofagus, positive correlation between seed weight and emergence in laboratory and nursery tests would be linked to the higher nutrient content of heavier seeds. High emergence and survival of N. obliqua and N. alpina, and higher growth of three Nothofagus species with high irradiation, would be adaptations to colonize open areas. The experimental results are compatible with patterns and processes found in this Nothofagus mixed forests, in which the interaction with Chusquea culeou plays a key role. In Nothofagus, deep mineral soil with large moisture increased emergence and survival, whereas litter reduced emergence; germination of C. culeou was very abundant and increased tree mortality.

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The effect of silvicultural management on the genetic diversity of a mixed Nothofagus forest in Lanín Natural Reserve, Argentina

Cited by 15 publications

References 47 publications

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes

Searching for molecular insight on hybridization in Nothofagus spp. forests at Lagunas de Epulauquen, Argentina

Early Development of Nothofagus (Nothofagaceae) Species From the Subantarctic Forest Under Experimental Conditions of Light, Substrate and Ecological Interaction

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The effect of silvicultural management on the genetic diversity of a mixed Nothofagus forest in Lanín Natural Reserve, Argentina

Cited by 15 publications

References 47 publications

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile&#8217;s central-southern Andes

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile&#8217;s central-southern Andes

Searching for molecular insight on hybridization in Nothofagus spp. forests at Lagunas de Epulauquen, Argentina

Early Development of Nothofagus (Nothofagaceae) Species From the Subantarctic Forest Under Experimental Conditions of Light, Substrate and Ecological Interaction

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Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes

Effects of solar radiation on regeneration patterns in a Nothofagus dombeyi (Mirb.) Oerst. old-growth forest in Chile’s central-southern Andes