Litterfall and Leaf Area Index in the CONECOFOR Permanent Monitoring Plots

摘要: Forest canopies are more sensitive and react promptly to abiotic biotic disturbances than other stand structural components. Monitoring crown canopy characteristics is therefore a crucial issue for intensive continuous monitoring programs of forest ecosystem status. These observations formed the basis measurement annual litter production leaf area index (LAI) in Italian permanent plots (CONECOFOR program) established within EC-UN/ECE program "Intensive (Level II) Ecosystems". Preliminary results after three years observation presented. The low value plot mean relative standard deviation (20.8 ± 1.9%) production, which any case never exceeded 30%, accounted good sampling error accuracy chosen method, seems be accurate enough detect changes through years. higher inconsistency amount woody fruits fractions over demonstrated greater reliability fraction or, on hand, LAI compared total litter. Mean values leaf-litter were rather high comparison with data reported literature similar stands, reflected both medium-high productivity juvenile phase development selected stands average. Focusing years, statistical analysis sub-sample showed existence significant differences production. findings seem attribute "year" factor driving role determining LAI. Temporal intermittence collection, together shortness period, make it difficult speculate or arrive at definitive conclusions due time-dependent factors. importance having complete database increase representativeness and, performing an integrated takes into account outcomes research actions, recognized as indispensable requirement achieving goals program.