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- Title
Characterizing forest structural types and shelterwood dynamics from Lorenz-based indicators predicted by airborne laser scanning.
- Authors
Valbuena, Rubén; Packalen, Petteri; Mehtätalo, Lauri; García-Abril, Antonio; Maltamo, Matti
- Abstract
In this study, Lorenz curve descriptors of tree diameter inequality were used to characterize the dynamics of forest development in a shelterwood-managed Pinus sylvestris (L.) dominated area. The purpose was to stratify the forest area into forest structural types (FST) from airborne laser scanning (ALS)-based wall-to-wall predictions of the chosen indicators: Gini coefficient (GC) and Lorenz asymmetry (LA). A clear boundary at GC = 0.5 was found, which separated even-sized (below) and uneven-sized (above) areas. Furthermore, a need for including LA in the characterization of the uneven-sized areas was detected, to distinguish bimodal from reverse J-shaped stands. Beta regression was used for the ALS predictions, yielding RMSEs of 19.67% for GC and 11.01% for LA. Based on our results, we concluded that forest disturbance decreases GC, whereas seed regeneration increases GC and, therefore, gap dynamics are characterized by shifts between either side of the GC = 0.5 threshold. In even-sized stands, GC decreases toward maturity owing to self-thinning occurring at the stem exclusion stage. In uneven-sized stands, the skewness of the Lorenz curve indicates understory development, as ingrowth decreases LA. The possible applications of the resulting FST map are discussed; for instance, in identifying areas needing silvicultural treatments or evaluating forest recovery from disturbances.
- Subjects
FORESTS &; forestry; SCOTS pine; BIOINDICATORS; SHELTERWOODS; FOREST dynamics; AIRBORNE lasers; PREDICTION theory; PLANT growth
- Publication
Canadian Journal of Forest Research, 2013, Vol 43, Issue 11, p1063
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2013-0147