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Production of native thistle biomass as an ecosystem service in contaminated Mediterranean soils

AutorMadejón, Paula ; Domínguez, María Teresa ; Fernández Boy, E.; Paneque, Patricia; Madejón, Engracia
Fecha de publicaciónjul-2017
EditorInternational Conference on the Biogeochemistry of Trace Elements
Citación14th International Conference on the Biogeochemistry of Trace Elements pág. 221 (2017)
ResumenThe use of autochthonous species for the phytomanagement of trace element contaminated sites reduces the risk of potential side-effects derived from the introduction of new plant species on ecosystems. Therefore, exploring the potential of different adapted native species for the phytomanagement of these soils is compulsory. The establishment of bioenergy crop species could be an option for the management of contaminated lands, without competition with food production for land use. As contaminated soils usually present unfavourable conditions for plant growth, the addition of amendments to this type of soils might be needed to establish bioenergy crops. They contribute to the immobilization of trace elements, and enhance biological processes that results in an improvement of soil quality. We aimed to explore the potential of certain native Mediterranean species for the revegetation of contaminated lands with energy production purposes. For this study, a contaminated acidic soil from the Guadiamar Green Corridor (South Spain) was selected, where 18 plots of 5x4m were established. Three treatments were tested: sugar beet lime (SL) addition, biosolid compost (BC) addition, and no amendment application (UN) to 6 plots, respectively. Then, half of the plots were planted with Cynara cardunculus and the other half with Silybum marianum, two thistle species with high growth rates adapted to local warm and dry conditions. Soils were collected at the beginning of the experiment (Nov 2015) and one year later. Plant harvest was carried out in summer 2016, and biomass and trace elements were analysed. Addition of SL increased soil pH from 3.5 to 6.6. Biosolid compost effect was noticeable by increasing soil total organic carbon (TOC) from 0.46% to 0.69%. After one year of plant establishment, differences in soil properties due to the different plant species were not detected. In general, trace element availability was inversely related to soil pH. Soil respiration was also positively affected by both amendments and increased with time from June to December 2016, related to soil moisture. Biomass production of both species was very low, especially for C. cardunculus. This species was very sensible to the soil conditions (acid pH, contamination and low TOC content) and the highest production (15 g dm plot-1) was obtained in SL plots. S. marianum was more tolerant to acid soil conditions and the highest biomass production (144 g dm plot-1 ) was found in BC plots. For both species biomass in UN soils was very low and only in one of the three plots plants could be collected. C. cardunculus shoots accumulated remarkable amounts of As and Pb in amended plots (36 and 65 mg kg-1 respectively), while S. marianum Cd and Zn concentrations in shoots were 3.5 and 600 mgkg-1 in the BC plots, respectively. According to these results, C. cardunculus would not be appropriate for this type of soils, due to the very low survival and biomass production rates, and the high As and Pb accumulation. In the case of S. marianum, more research is needed to evaluate its viability as a bioenergy crop species in contaminated soils.
DescripciónComunicación oral presentada en el 14th International Conference on the Biogeochemistry of Trace Elements 16-20 July, 2017 - ETH Zurich, Switzerland. Abstracts.-- ICOBTE2017 – ETH Zurich, Switzerland – 16-20 July, 2017 - Abstracts. Sypecial Symposium 9 Improving soil biodiversity, functionality and ecosystem services of trace element-contaminated soils under interacting effects of (phyto)management and climate change
Versión del editorhttp://icobte2017.ch/index.php/program
URIhttp://hdl.handle.net/10261/155324
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