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Role of phytolith occluded carbon of cereales plants for climate change mitigation

Rutkowska Beata, Schröder Peter, Mench Michel, Rineau Francois, Szulc Witold, Szulc Wiesław, Pobereżny Jarosław, Tiideberg Kristjan, Niedziński Tomasz, Loit Evelin

Journal of Water and Land Development

2024

no. 60

50--58

Phytolith-occluded carbon (PhytOC) is highly stable, and constitutes an important source of long-term C storage in agrosystems. This stored carbon is resistant to the processes of oxidation of carbon compounds. In our research phytolith content in barley (Estonia) and oat (Poland) grain and straw was assessed at field trials, with Si as a liquid immune stimulant OPTYSIL and compost fertilisation. We showed that cereals can produce relatively high amounts of phytoliths. PhytOC plays a key role in carbon sequestration, particularly for poor, sandy Polish and Estonian soils. The phytolith content was always higher in straw than in grain regardless of the type of cereals. The phytolith content in oat grains varied from 18.46 to 21.28 mg∙g-1 DM, and in straw 27.89-38.97 mg∙g-1 DM. The phytolith content in barley grain ranged from 17.24 to 19.86 mg∙g-1 DM, and in straw from 22.06 to 49.08 mg∙g-1 DM. Our results suggest that oat ecosystems can absorb from 14.94 to 41.73 kg e-CO2∙ha-1 and barley absorb from 0.32 to 1.60 kg e-CO2∙ha-1. The accumulation rate of PhytOC can be increased 3-fold in Polish conditions through foliar application of silicon, and 5-fold in Estonian conditions. In parallel, the compost fertilisation increased the phytolith content in cereals.

Urban mining: Phytoextraction of noble and rare earth elements from urban soils

Gawroński Stanisław, Łutczyk Grzegorz, Szulc Wiesław, Rutkowska Beata

Archives of Environmental Protection

2022

Vol. 48, no. 2

24--33

The increasing demand for noble metals boosts their price. In order to meet the increasing demand for elements, a number of technologies are being developed to recover elements already present in the environment. Traffic-related metal pollution is a serious worldwide concern. Roadside soils are constantly subjected to the deposition of metals released by tailpipe gases, vehicle parts, and road infrastructure components. These metals, especially platinum group elements from catalytic converters, accumulating in the soil pose a risk both for agricultural and residential areas. Phytomining is suggested as a novel technology to obtain platinum group metals from plants grown on the contaminated soil, rock, or on mine wastes. Interest in this method is growing as interest in the recovery of rare metals is also increasing. Based on the research of many authors, the sources and amounts of noble metals that accumulate in soil along communication routes have been presented. The paper presents also plants that can be used for phytomining.

Aby sprostać rosnącemu zapotrzebowaniu na metale szlachetne poszukuje się technologii odzyskiwania pierwiastków już obecnych w środowisku. Gromadzące się w glebie metale, zwłaszcza pierwiastki z grupy platynowców pochodzące z katalizatorów, stanowią zagrożenie dla środowiska. Fitoekstrakcja jest technologią wykorzystywaną do pozyskiwania metali z grupy platynowców z roślin rosnących na zanieczyszczonej glebie, skale lub odpadach kopalnianych. Zainteresowanie tą metodą rośnie wraz ze wzrostem zainteresowania odzyskiem metali rzadkich. Na podstawie wyników badań różnych autorów przedstawiono ilości metali szlachetnych gromadzących się w glebie wzdłuż szlaków komunikacyjnych. W pracy przedstawiono także rośliny, które można wykorzystać do fitoekstrakcji.