c6.8.7 – Growth as a key indicator of ecosystems’ status and trend in forest monitoring

Fabbio G (1), Bertini G (1), Calderisi M (2), Ferretti M (2)

(1) CRA-Istituto Sperimentale per la Selvicoltura, Arezzo; (2) TerraData environmetrics, Siena, Italy.
Collocazione: c6.8.7 – Tipo Comunicazione: Poster
6° Congresso SISEF *
Sessione 8: “Poster: “Biodiversità, cambiamenti climatici, monitoraggio”” *

Contatto: Gianfranco Fabbio (fabbio@selvicoltura.org)

Abstract: The Italian programme of forest ecosystems monitoring (CONECOFOR), framed within the Intensive Forest monitoring Programme launched by EC in 1995 (1091/94 Reg.) and continued under the Forest Focus Reg (EC 2152/2003), measures a number of attributes of the biological, physical and chemical compartment on the basis of a permanent plot network. Radial growth change between the three surveys carried out in 1997, 2000 and 2005 are examined in the paper. Four main forest types are identified according to tree species, management system and stand structure: beech high forests, Norway spruce forests, aged coppice forests, deciduous, evergreen oaks and beech transitory crops. Data were stratified according to the different growth environment into three main layers (dominant-intermediate-dominated). Aims of the analysis were to verify the changes occurring in the surveyed tree populations in terms of diameter distributions, basal area allocation to each layer and its annual increment, mortality location and rate at each survey. An obvious reduction of annual increment was detected on two/thirds of plots over the period 2000-05 as compared to the 1997-2000. Current mortality rate is mostly located into the dominated and intermediate layers and can be explained by the inter-tree competition in almost all of the observed case-studies. In this perspective, overstocking seems therefore an important factor driving the reduced growth course. However, besides occasional events recorded on a few plots, a factor contributing to growth rate reduction over the last five years may be identified in the extreme drought in the summer 2003. This helps also to explain the reduction on growth in terms of plots’ geographical distribution and tree species concerned. (This is a synthesis of the forthcoming report “Status and trend of key attributes monitored in selected forest ecosystems in Italy over the period 1995-2005”. Annali CRA-ISSEL.)

Citazione: Fabbio G , Bertini G , Calderisi M , Ferretti M (2007). Growth as a key indicator of ecosystems’ status and trend in forest monitoring . 6° Congresso Nazionale SISEF, Arezzo, 25 – 27 Set 2007, Contributo no. #c6.8.7