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Forest biomass distribution and its loss between 1985 and 2010 in the Western Carpathians

Main-Knorn, Magdalena and Hostert, Patrick (2014) Forest biomass distribution and its loss between 1985 and 2010 in the Western Carpathians. In: Conference Abstracts Forum Carpaticum 2014. Forum Carpaticum 2014, 16.-18. Sept. 2014, Lviv, Ukraine.

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Official URL: http://www.forumcarpaticum.org/

Abstract

The ability to monitor and quantify forest change is a prerequisite for better understanding human-induced environmental changes and their impact on forest ecosystems. Moreover, the questions relating to the spatial (where) and temporal (when) dimensions, and its magnitude (how much) remain fundamental to forest services concerns. Here, we assessed changes in forest aboveground biomass associated with forest disturbances and recovery between 1985 and 2010 in the Western Carpathians. First, yearly maps of aboveground biomass based on Landsat time series and field data were created. Second, we applied a trajectory-based change detection to reconstruct forest disturbances and recovery. Then, we distinguished and investigated abrupt and gradual disturbances in respect to topographic factors and dominant stand age. Finally, we quantified biomass losses and gains associated with abrupt and gradual disturbances, and forest recovery. Overall, 55% (~30,700 ha) of the total coniferous forest experienced a loss of biomass over the observation period, while ~30% showed severe or complete removal of forest biomass. At the same time, 11.2% of the area was reforested or regenerated on previously damaged forest stands. The total coniferous biomass dropped by 15% between 1985 and 2010, indicating negative balance between the losses and the gains. Comparing abrupt and gradual disturbances, results indicated more chronic and long-term than acute biomass losses at every altitude and slope. The distribution of the relative magnitude of biomass loss (low, moderate, and severe loss) by elevation and slope zones revealed significantly higher fraction of severe losses caused by abrupt than gradual disturbances. Both disturbances occurred predominantly on S, SW, and SE facing slopes, where severe biomass losses were dominating. Severe biomass loss affected by gradual disturbances lasted up to ten years, and its proportion increased with altitude. Finally, abrupt disturbances were predominant within older coniferous stands (between 90 and 120 years). The synergistic effect of unsustainable forest management in the past, catalyzed by high levels of pollution loads during communist times caused a significant damage to the coniferous forests in the Western Carpathians. Since the early 1990s spruce-dominated stands have shown low resistance against biotic and abiotic factors. They have thus been susceptible to fungal diseases and insects outbreaks on the one hand, and adverse climate condition with subsequent extreme weather events on the other. Since 2005, widespread and severe biomass loss has taken place. Monitoring and quantifying forest changes are of prime scientific and economic interest. Our study provided an example of spatially and temporally explicit quantification of forest biomass. Such knowledge is prerequisite for sustainable forest management and the provision of ecosystem services.

Item URL in elib:https://elib.dlr.de/91910/
Document Type:Conference or Workshop Item (Speech)
Title:Forest biomass distribution and its loss between 1985 and 2010 in the Western Carpathians
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Main-Knorn, Magdalenamagdalena.main-knorn (at) dlr.deUNSPECIFIED
Hostert, PatrickHU BerlinUNSPECIFIED
Date:September 2014
Journal or Publication Title:Conference Abstracts Forum Carpaticum 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
UNSPECIFIEDforumcarpaticum.org
Status:Published
Keywords:Carpathians
Event Title:Forum Carpaticum 2014
Event Location:Lviv, Ukraine
Event Type:international Conference
Event Dates:16.-18. Sept. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By:INVALID USER
Deposited On:21 Nov 2014 18:43
Last Modified:21 Nov 2014 18:43

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