Spatial pattern of Austrocedrus chilensis wilting and the scope of autocorrelation analysis in natural forests

Rosso, Pablo; Baccalá, Nora; Havrylenko, Maria; Fontenla, Sonia

doi:10.1016/0378-1127(94)90022-1

Cited by 22 publications

(23 citation statements)

References 14 publications

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“…This is an indication that the whole stand may be susceptible to develop the decline. Previous works suggested that ''mal del ciprés'' presents a disaggregated pattern of distribution only at high level of incidence (Rosso et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

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The decline of Austrocedrus chilensis forests in Patagonia, Argentina: soil features as predisposing factors

Manna¹,

Rajchenberg²

2004

Forest Ecology and Management

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Section: Discussionmentioning

confidence: 99%

“…The spatial pattern of the disease in each area was visually classified as aggregated or disaggregated (Rosso et al, 1994) (Table 1). An aggregated pattern refers to the decline presenting hot spots clearly differentiated from the surrounding asymptomatic forest areas (Shurtleff and Averre, 1997).…”

Section: Study Sitesmentioning

confidence: 99%

The decline of Austrocedrus chilensis forests in Patagonia, Argentina: soil features as predisposing factors

Manna¹,

Rajchenberg²

2004

Forest Ecology and Management

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“…Havrylenko et al (1989) reported an increase of percentage of affected trees from 24 to 61%; however, this change was observed along six months (spring of 1988 to winter of 1989). In the same way, Rosso et al (1994) established an increase from 52 to 72% along ten months (December 1990to September 1991. Both studies were developed in other A. chilensis forests and the rapid progression of mortality was probably influenced by the soil properties and the abiotic conditions on the sites (La Manna and Rajchenberg, 2004a,b).…”

Section: Discussionmentioning

confidence: 61%

“…These dendrochronological derived maps showed several points of appearance of affected trees and their relationships with temporary or permanent water streams. Analysis of spatial association between symptomatic and asymptomatic trees suggested that the mortality tends to occur patchily , and autocorrelation analysis showed that affected pairs of trees appear aggregated at 3 m distance (Rosso et al, 1994). The last mentioned works have a great proportion of areas with aggregated pattern and high incidence of cypress mortality.…”

Section: Discussionmentioning

confidence: 97%

Temporal progression trends of cypress mortality at permanent plots in a National forest reserve of Austrocedrus chilensis (Patagonia, Argentina)

Mujtar

Andenmatten²,

Perdomo³

et al. 2011

For. syst.

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Longevity is a characteristic of forest trees that influences their responses to challenges by biotic and abiotic stresses and the temporal development of symptoms. Monitoring programs have been extensively used to detect the impact of climatic change, air pollution and outbreaks of pathogens on forest health, growth and dynamics. In Argentina, forests of Patagonian cypress are affected since mid twenty century by a mortality process called «mal del ciprés» (cypress mortality), but information about their temporal progression is scarce. In the present work we used a database from a program of dasometric permanent plots to analyse the temporal development of cypress mortality on plot and tree level, and determine qualitatively the spatial distribution of affected trees. Particular pulses of appearance of affected trees shared by all plots, rapid or slow progress of mortality at tree level and a homogeneous distribution of affected trees without a clear pattern of expansion from a central point were determined. The results indicate that the episodic appearance of affected trees can be related with warm and dry climatic periods and suggest that the individuals affected by cypress mortality share some special characteristics such as genetic background, developmental conditions or physiological mechanisms for drought responses.Key words: symptoms development; monitoring; spatial distribution; drought; mortality pattern. ResumenTendencias en el desarrollo temporal del mal del ciprés en parcelas permanentes de una Reserva Forestal Nacional de Austrocedrus chilensis (Patagonia, Argentina)La longevidad de las especies arbóreas afecta la respuesta a estreses bióticos o abióticos y, en gran medida, determina el desarrollo temporal de los síntomas. Por tal motivo, los programas de monitoreo se han empleado para detectar el impacto del cambio climático, la polución ambiental o estallidos de patógenos en la sanidad y dinámica de los bosques. En Argentina, los bosques de Austrocedrus chilensis sufren desde 1945 una mortalidad masiva conocida como «mal del ciprés»; sin embargo, hay escasa información sobre su progresión temporal. En el presente trabajo una base de datos de un programa de parcelas permanentes se empleó para analizar el desarrollo temporal de la mortalidad a nivel de parcela e individuo y la distribución espacial de los árboles afectados. Se determinó que la aparición de síntomas sigue un patrón de pulsos compartido por todas las parcelas, con mortalidad rápida o lenta a nivel de individuo y una distribución homogénea de la mortalidad sin un patrón de expansión desde un punto central. Los resultados indican que los episodios de afectación pueden ser relacionados con períodos climáticos cálidos y secos, sugiriendo que los individuos afectados comparten características tales como background genético, condiciones de sitio o respuesta a la sequía.Palabras clave: desarrollo temporal de síntomas; monitoreo; distribución espacial; sequía; patrón de mortalidad.

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“…At the landscape level, mortality appears either as aggregations of varying sizes of dead trees or as dispersed with declining trees (Rosso et al 1994;La Manna and Rajchenberg 2004). Symptoms at the stand level include loss of crown vigour and mortality that affects all tree size classes (Hranilovic 1988;Havrylenko et al 1989;Rajchenberg and Cwielong 1993;Loguercio et al 1998) resulting in a decrease in the stand productivity over time.…”

Section: Introductionmentioning

confidence: 98%

Can a natural experiment be used as a tool to design partial cutting regimes? The decline of Austrocedrus chilensis forests, an example

Amoroso

Larson

2010

Journal of Forest Research

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The forests of Austrocedrus chilensis in Argentina suffer mortality from what is locally known as 'mal del cipre´s'. This disturbance usually appears as aggregations of dead trees of varying sizes. The mortality process seems unpredictable, and regeneration establishment is variable under these conditions. The highly variable mortality rates results in a natural experiment that allows the correlation of overstory mortality with regeneration rate. This correlation should then make it possible to estimate the regeneration success which would follow after different levels of partial cutting, allowing the purposeful direction of the regeneration process. We collected data from eight Austrocedrus chilensis-dominated stands and reconstructed overstory mortality over time and correlated it to the regeneration recruitment. Mortality showed two patterns: increasing 'continuous' mortality over time, and 'pulses' of important basal area loss in short periods. Overstory mortality had an effect on the recruitment and composition of the regeneration by allowing different species establishment depending on the degree of mortality. By quantifying mortality basal area and recruitment over time, we calculated estimates that can provide partial cutting guidance. Partial cuttings would then allow the purposeful direction of the regeneration process. Stand reconstruction studies provided a useful tool to help designing regeneration systems using a natural experiment. Some specific management implications for symptomatic A. chilensis forests are given.

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Spatial pattern of Austrocedrus chilensis wilting and the scope of autocorrelation analysis in natural forests

Cited by 22 publications

References 14 publications

The decline of Austrocedrus chilensis forests in Patagonia, Argentina: soil features as predisposing factors

The decline of Austrocedrus chilensis forests in Patagonia, Argentina: soil features as predisposing factors

Temporal progression trends of cypress mortality at permanent plots in a National forest reserve of Austrocedrus chilensis (Patagonia, Argentina)

Can a natural experiment be used as a tool to design partial cutting regimes? The decline of Austrocedrus chilensis forests, an example

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