Abstract
Little is known about the gap pattern of primeval beech forests, since large‐scale studies with continuous coverage are lacking. Analyses of forest structural patterns have benefitted from advances in remote sensing, especially with the launch of satellites providing data of submetric ground resolution. These developments can strongly advance our knowledge of natural forest dynamics and disturbance regimes. The Uholka‐Shyrokyi Luh forest in the Ukrainian Carpathians, the largest remnant of primeval European beech (Fagus sylvatica L.) covering 102.8 km2, is an outstanding object to analyze the frequency distribution of gap sizes and to infer processes of forest dynamics. A stereo pair of very high‐resolution WorldView‐2 satellite images was used to characterize the forest's gap pattern. Canopy gaps were first digitized stereoscopically based on the image pair. In a second step, spectral properties in the red and yellow frequency bands were used to distinguish the stereoscopically mapped gap areas from non‐gap areas, which enabled gap mapping over the entire study area. To validate the spectral gap mapping 338 randomly distributed samples were assigned manually to gap and non‐gap areas based on the ortho‐images. We found excellent agreement except for an overestimation of gaps close to clouds due to diffuse image areas. The frequency distribution of gap size revealed the forest to be structured by a small‐scale mosaic of gaps mainly <200 m2 (98% of the gaps). Only a few large, stand‐replacing events were detected, most probably caused by a wind storm in March 2007 and a heavy wet snow fall in October 2009. The small canopy gaps reflect fine‐scale processes shaping forest structure, i.e., the death of single trees or groups of a few trees and is in line with the findings of the terrestrial forest inventory. We conclude that remote sensing approaches based on very high‐resolution satellite images are highly useful to characterize even small‐scale forest disturbance regimes and to study long‐term gap dynamics. Stereo satellite images provide two viewing angles of the study area, thus allowing for a highly accurate mapping of canopy gaps in forests with a complex topography.
Highlights
Natural disturbances are key drivers of forest dynamics, largely shaping vertical structure as well as horizontal patterns (White 1979)
We conclude that remote sensing approaches based on very high-resolution satellite images are highly useful to characterize even small-scale forest disturbance regimes and to study long-term gap dynamics
This general picture is similar to the results of the terrestrial inventory, where 60% of the measured canopy gaps were,200 m2 and a few larger canopy gaps were scattered all over the study area (Fig. 2b).The share of small gaps, was higher in the spectrally mapped gaps (Fig. 4a) than in the gaps assessed terrestrially, while the field survey revealed a higher percentage of gaps in the larger size classes (Fig. 4b)
Summary
Natural disturbances are key drivers of forest dynamics, largely shaping vertical structure as well as horizontal patterns (White 1979). The disturbance regime can be defined as the characteristics (frequency, extent and severity) of the dominant disturbance types as well as HOBI ET AL. Their interactions (Frelich 2002). In temperate forests, the major natural disturbances are fire, windstorms, ice storms, droughts and insect outbreaks (Pickett and White 1985). Central European temperate forests are mainly affected by wind and, to a smaller extent, by snow and ice, while forest fire and drought are typically limited to drier areas, e.g., the Mediterranean (Schelhaas et al 2003). Given that severe standreplacing events appear to be rare (Tabaku 2000, Drossler and von Lupke 2005), forest dynamics are understood to be shaped by finescale processes (Trotsiuk et al 2012, Hobi et al 2014)
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