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The Influence of Slope Positions on the Recovery Response of Compacted Soil Properties and Enzyme Activity in an Oriental Beech Stand in the Hyrcanian Forests, Iran

Author

Listed:
  • Meghdad Jourgholami

    (Faculty of Natural Resources, Department of Forestry and Forest Economics, University of Tehran, Karaj 999067, Alborz, Iran)

  • Alireza Ramineh

    (Faculty of Natural Resources, Department of Forestry and Forest Economics, University of Tehran, Karaj 999067, Alborz, Iran)

  • Ghavamodin Zahedi Amiri

    (Faculty of Natural Resources, Department of Forestry and Forest Economics, University of Tehran, Karaj 999067, Alborz, Iran)

  • Eric R. Labelle

    (Department of Ecology and Ecosystem Management, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany)

Abstract

Several studies emphasize the effects of slope position on divergences of soil properties in forest ecosystems, but limited data is available on the impact of slope position on recovery levels of soil, which were exposed to compaction due to machine traffic. This study examined the effects of slope position (i.e., S; summit, BS; backslope, and TS; toeslope) on recovery rate of soil properties and enzyme activity four years after ground-based harvesting operations were performed on machine operating trails, compared to the undisturbed areas (UND) in the Hyrcanian forests (north of Iran). Soil properties and enzyme activity of compacted soil in machine operating trails showed significant trend differences among the slope positions. A significantly lower soil bulk density, penetration resistance, soil moisture, aggregate stability, pH, sand, and C/N ratio were found in TS compared to the values recorded in the BS and S treatments. Conversely, total porosity, macroporosity, silt, clay, organic C, total N, available nutrients (i.e., P, K + , Ca 2+ , and Mg 2+ ), fulvic and humic acid, earthworm density and dry mass as well as fine root biomass were higher in TS than in the BS and S treatments. Soil microbial respiration, MBC, NH 4 + , NO 3 − , N mineralization, and MBN were significantly higher in the UND areas followed by TS > BS > S treatment. The highest activity levels of enzymes (i.e., urease, acid phosphatase, arylsulfatase, invertase, and ß-N-acetylglucosaminidase) were detected in the UND areas, followed by TS > BS > S treatment. The highest recovery levels of all soil properties and enzyme activity were found in TS, followed by BS > S treatment. However, the full recovery of soil properties did not occur even after a 4-year period, compared to the UND areas. Our study results highlight the significance of the slope position in augmenting divergence in soil properties and enzyme activity after ground-based machine traffic.

Suggested Citation

  • Meghdad Jourgholami & Alireza Ramineh & Ghavamodin Zahedi Amiri & Eric R. Labelle, 2019. "The Influence of Slope Positions on the Recovery Response of Compacted Soil Properties and Enzyme Activity in an Oriental Beech Stand in the Hyrcanian Forests, Iran," Sustainability, MDPI, vol. 11(7), pages 1-13, April.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:7:p:1940-:d:219123
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    References listed on IDEAS

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    1. Meghdad Jourgholami & Ali Nasirian & Eric R. Labelle, 2018. "Ecological Restoration of Compacted Soil Following the Application of Different Leaf Litter Mulches on the Skid Trail over a Five-Year Period," Sustainability, MDPI, vol. 10(7), pages 1-16, June.
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