University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Julia Maria Von Chamier Glisczinski
(2016):
Effects of Biochar and Compost Amendments on the Fluxes of Copper in contaminated Vineyard Soils to Leachate and Plant Tissues.
Master / Diploma Thesis - Institut für Bodenforschung (IBF),
BOKU-Universität für Bodenkultur,
pp 91.
UB BOKU
obvsg
- Abstract:
- Extensive use of copper (Cu) based fungicides has resulted in an accumulation of this element in vineyard soils, often to concentrations that detrimentally affect soil function. Potentially, organic soil amendments such as biochar and compost could reduce Cu mobility and restore soil function. This study aimed to determine the effect of those additives on Cu translocation from soil to leachate and plant tissues. A pot experiment tested nine soil amendments and a comparative control with four replicates on two soil types, a slightly acidic and a calcareous soil. Leachate analysis included pH, EC, Cutotal, DOC, cations, anions and free Cu2+-ions calculated with VISUAL MINTEQ® at two sampling dates. Results showed that additives had higher potential to reduce Cu2+ in slightly acidic soils than in calcareous soils. Decreasing phytotoxic Cu2+ was predominantly attributed to increasing pH in leachate thus liming was as sufficient as tested amendments. Activation of biochar with tartaric or citric acid did not show any effect on Cu solubility. On calcareous soil, amendments increased Cutotal in leachate but showed varying effects on Cu2+ concentration. Inconsistency between first and second leachate analysis, which only differed in the degree of plant growth, indicated that root exudates may change Cu speciation. Cutotal and Soil-Plant Analysis Development values in Vitis vinifera L. leaves did not remarkably differ from control on either soil. A field experiment tested the effect of four soil amendments and a comparative control each with four replicates on Cu uptake of Trifolium repens L. roots in an calcareous vineyard in Lower Austria. Only the wood biochar amendment significantly reduced Cu concentration in roots (by 51%) compared to control although values were still in range to be phytotoxic. An issue that was not addressed in either experiment was whether Cu-DOC complexes are phytoavailable.
- Beurteilende(r): Zehetner Franz