- Standardsignatur9087
- TitelImpact on soil functions and soil greenhouse gas emissions by harvesting technologies on compaction-prone forest soils
- Verfasser
- ErscheinungsortStockholm
- Verlag
- Erscheinungsjahr2024
- Seiten1096
- MaterialBandaufführung
- Datensatznummer40005285
- Quelle
- AbstractTemperate forests are a significant sink for the greenhouse gases (GHG) methane (CH4), carbon dioxide (CO2) and soil emissions of nitrous oxide (N2O) are low. However, forest management can have a significant long-term impact, and soil compaction caused by heavy forest machine operation, in particular, can be a driving force. Especially silty and clayey soils are compaction-prone and have a low recovery capacity. These changes may affect the soil microbial community and influence soil respiration, methane uptake, and nitrogen turnover. Results of a one-year measurement campaign in an Austrian beech forest catchment on Stagnic cambisol over Flysch sediments (N 48°07’16”, E 16°02’52’’, 510 m MASL) revealed a significant reduction in the CH4 uptake rates and increased soil CO2 and N2O emissions at skid tails, six years after harvesting. Compared to the forest stand annual global warming potential (GWP100) was 58% higher at skid tails. The objective of the current project HoBo (Securing the Sustainability of Forest Soil Functions via Optimized Harvesting Technologies, https://dafne.at/projekte/hobo) is to determine the effects of harvester-forwarder use with/without tracks (HF/HFt) and cable-yarding with motor-manual-felling (CMM), on several soil functions to provide further recommendations for a site-adapted technology use for heavy soils. We will present results from currently performed measurements at three forest stands on heavy soils, at the Flysch zone and the Molasse basin (North Alpine foreland basin), recently thinned by HF, HFt and CMM techniques. To gain insights into the effects on soil chemistry and microbiology, and changes in microbial community, we conduct soil analysis at 6-week intervals for nitrogen availability, microbial carbon and nitrogen biomass, and phospholipid fatty acid (PLFA) analysis. Impacts on soil GHG flux rates of CO2, CH4, and N2O are measured with trace gas analyzers (Li-Cor 7810 and 7820), either manually (Li-Cor Smart Chamber 8200-01S) in a 3-weeks interval at the recently thinned stands, or continuously (5-minute interval) with automatic chambers at the plots that were harvested seven years ago, at the LTER-CWN research site Klausen-Leopoldsdorf.
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