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Institute of Soil Landscape Research

Institute of Land Use Systems

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1500Spatiotemporal dynamics of biogenic Si pools in initial soils and their relevance for desilicationSpatiotemporal dynamics of biogenic Si pools in initial soils and their relevance for desilication01/01/2013 00:00:0031/03/2017 00:00:00abgeschlossencompletedInst. für BodenlandschaftsforschungInst. of Soil Landscape Researchx5xHöhn, Axel; Sommer, Michael; Kaczorek, Danuta; Puppe, Danielx222x503x862x1159x<div class='ntm_BLF'>BLF</div>  2013 Spatiotemporal dynamics of biogenic Si pools in initial soils and their relevance for desilication Inst. für Bodenlandschaftsforschung Höhn, Axel; Sommer, Michael; Kaczorek, Danuta; Puppe, Daniel Drittmittel Inst. of Soil Landscape Research completed abgeschlossen <div class="ExternalClassE4E0C631-8AA9-4603-BA24-CB62F466C15A"><ul><li>2016 Landschaftsprozesse</li></ul></div> <div class="ExternalClass1654A7BD-46AA-4D0F-9F2B-260770B47F64"><ul><li>BTU - Brandenburgische Technische Universität Cottbus-Senftenberg </li></ul></div> <div class="ExternalClassFE842242-F4CE-4641-A503-9ED3D059EDE4"></div> <div class="ExternalClassEFC5FDF1-777C-431B-B6F7-0E5E876A28DC"></div> <div class="ExternalClass698462C1-CE86-438D-A390-40BD01642343"><ul><li>Prof. Dr. Manfred Wanner</li></ul></div><div class="ExternalClass67840B28BB8741FF820D3E9BB050DCD3"><p>?The project has the objective to clarify the interactions between dynamics of biogenic Si pools and desilication rates in transient state soil systems. This will be the first attempt ever to quantify sizes and turnover dynamics of both phytogenic and zoogenic Si pools in soils at the same time, together with the controls acting on them. Starting with a characterization of soils’ initial state at catchment scale we will analyze the annual SiO<sub>2</sub> production of the vegetation as a function of (i) spatial distribution of plant available Si in soils as well as (ii) dynamics of invading Si accumulators. To do so we will employ modern remote sensing techniques (UAV). After four vegetation periods, changes in soils’ phytogenic Si pool will be compared to cumulative SiO<sub>2</sub> production of Si accumulators by mass balance calculations. Using plot scale manipulation experiments we will elucidate the influence of an increasing phytogenic Si pool on desilication rates. At four sites annual Si exports via soil solution will be determined under pure stands of both, Si accumulator and non-accumulator plants. Plant SiO<sub>2</sub> will be subjected to dissolution experiments to yield mechanistic information necessary for the development of algorithms to model observed desilication rates. The dynamics of the zoogenic Si pool (testate amoebae) in soil will be quantified as a function of plant pattern dynamics at catchment scale. For the first time, the attempt will be made to quantify the zoogenic Si pool size by analyzing living and dead amoebae with Energy-dispersive X-Ray Spectroscopy combined with Scanning Electron Microscopy (SEM-EDX). The factors controlling testate amoebae densities will be identified in plot and lab experiments. We will test the presumed carbon, water / nutrient and Si limitation on amoebal growth at plot scale using a completely randomized block design. The influence of silica supply on testate amoebae (idiosome growth) will be clarified in lab experiments under controlled conditions (clonal cultures).</p> </div> <div class="ExternalClass38AEF599-2052-4AB1-9218-41DD825F4DC7"><ul><li>Inst. für Bodenlandschaftsforschung</li></ul></div><div class="ExternalClass104CB2FE-362E-45CE-8202-EFBCE0D243AA"><ul><li>Inst. of Soil Landscape Research</li></ul></div><div class="ExternalClassA8B292B1-45B2-4DC1-991F-AE48154049BA">Dr. Axel Höhn; Dr. Danuta Kaczorek; Dr. Daniel Puppe; Prof. Dr. Michael Sommer</div>Sommer, Michael<div class="ExternalClass0546DCEF-1652-4004-9F73-33D646115D7D"><a title="e-mail" target="_blank" href="">Prof. Dr. Michael Sommer</a></div><div class="ExternalClassE4E0C631-8AA9-4603-BA24-CB62F466C15A"><ul><li>2016 Landschaftsprozesse</li></ul></div><div class="ExternalClass2F7F8B27-0712-4F7B-8AFA-6EC1BFB2E192"><ul><li>2016 Landscape Functioning</li></ul></div>x259x<div class="ExternalClass1654A7BD-46AA-4D0F-9F2B-260770B47F64"><ul><li>BTU - Brandenburgische Technische Universität Cottbus-Senftenberg </li></ul></div>x1999x    <div class="ExternalClass698462C1-CE86-438D-A390-40BD01642343"><ul><li>Prof. Dr. Manfred Wanner</li></ul></div>33 
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