| Autor: |
Nora Baccalá, Maria Havrylenko, Pablo H. Rosso, Sonia Fontenla |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Forest Ecology and Management. 67:273-279 |
| ISSN: |
0378-1127 |
| DOI: |
10.1016/0378-1127(94)90022-1 |
| Popis: |
Austrocedrus chilensis forests in Argentina are suffering mortality which was first registered several decades ago and the causes of which are as yet unknown. The aim of this work was to determine the spatial pattern of trees affected and to evaluate the usefulness of autocorrelation analysis in natural forests. In order to apply this method, three plots were established in natural forests in the Parque Nacional Nahuel Huapi (Argentina). Each tree was labelled and surveyed for visual symptoms and maps of each plot were constructed. Two infection processes, one at random and the other as patches, were stimulated. The results of the natural infection show that the affected pairs of trees appear aggregated at 3 m distance whenever the incidence of mortality is relatively low. The results of the simulation processes indicated that the scope of the autocorrelation analysis was influenced by the incidence level of the disease (over 90%). The same fact was also observed in natural infection of Austrocedrus chilensis. However, this fact was observed as a random tendency at 55% of the incidence level (far below the 90% of the simulation processes). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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