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A tree from waste: Decontaminated dredged sediments for growing forest tree seedlings
Francesca Ugolini1, Barbara Mariotti2, Alberto Maltoni2
1Institute of Biometeorology - National Research Council of Italy, Via G. Caproni 8, 50145 Firenze, Italy.
Journal of Environmental Management
|February 7, 2018
Summary
Phytoremediated sediments offer a sustainable alternative nursery substrate for holm oak (Quercus ilex L.) seedlings. These decontaminated sediments support comparable germination and growth to traditional peat, especially when mixed with soil.
Area of Science:
- Environmental Science
- Horticulture
- Forestry
Background:
- Dredged waterway sediments often pose disposal challenges.
- Phytoremediation offers a method to decontaminate sediments.
- Sustainable alternatives to traditional peat-based substrates are needed for forest nurseries.
Purpose of the Study:
- To evaluate the suitability of phytoremediated sediments as a substrate for holm oak (Quercus ilex L.) seedling production.
- To compare the germination, physiological, and morphological traits of holm oak seedlings grown in various sediment-amended substrates against traditional and agronomic soils.
Main Methods:
- Holm oak acorns were sown in pots containing different mixtures of phytoremediated sediments and agricultural soil (0%, 33%, 66%, 100% sediment).
- Control groups included 100% agricultural soil and 100% traditional peat-based substrate.
- Seedling germination, survival, physiological performance (photosynthetic capacity), and morphological traits (height, root development) were assessed over one growing season.
Main Results:
- Seedlings in higher sediment concentrations (especially 66% sediment mix) showed germination rates comparable to traditional substrates and slightly higher survival than 100% agricultural soil.
- Physiological performance was similar to traditional substrates, with some mixed substrates showing improved photosynthetic capacity.
- Seedling height and growth flushes were comparable to standard forest nursery stock, with improved root system development in mixed substrates compared to 100% agricultural soil.
Conclusions:
- Phytoremediated dredged sediments can be effectively utilized as a viable nursery substrate for forestry species like holm oak.
- Mixing sediments with agricultural soil enhances seedling growth and root development, offering a sustainable solution for sediment management and reforestation efforts.
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