TY - GEN A1 - Ehrmann, Otto A1 - Puppe, Daniel A1 - Wanner, Manfred A1 - Kaczorek, Danuta A1 - Sommer, Michael T1 - Testate amoebae in 31 mature forest ecosystems - densities and micro-distribution in soils T2 - European Journal of Protistology Y1 - 2012 SN - 1618-0429 N1 - Diese Publikation entstand in Zusammenarbeit mit dem ZALF e.V. und dem Büro für Bodenmikromorphologie und Bodenbiologie Creglingen (Erstautor) VL - 48 IS - 3 SP - 161 EP - 168 ER - TY - GEN A1 - Puppe, Daniel A1 - Kaczorek, Danuta A1 - Wanner, Manfred A1 - Sommer, Michael T1 - Dynamics and drivers of the protozoic Si pool along a 10-year chronosequence of initial ecosystem states T2 - Ecological Engineering N2 - The size and dynamics of biogenic silicon (BSi) pools influence silicon (Si) fluxes from terrestrial to aquatic ecosystems. The research focus up to now was on the role of plants in Si cycling. In recent studies on old forests annual biosilicification rates of idiosomic testate amoebae (i.e. TA producing self-secreted silica shells) were shown to be of the order of Si uptake by trees. However, no comparable data exist for initial ecosystems. We analyzed the protozoic BSi pool (idiosomic TA), corresponding annual biosilicification rates and readily available and amorphous Si fractions along a 10-year chronosequence in a post-mining landscape in Brandenburg, Germany. Idiosomic Si pools ranged from 3 to 680 g Si ha−1 and were about 3–4 times higher at vegetated compared to uncovered spots. They increased significantly with age and were related to temporal development of soil chemical properties. The calculation of annual biosilicification resulted in maxima between 2 and 16 kg Si ha−1 with rates always higher at vegetated spots. Our results showed that the BSi pool of idiosomic TA is built up rapidly during the initial phases of ecosystem development and is strongly linked to plant growth. Furthermore, our findings highlight the importance of TA for Si cycling in young artificial ecosystems. Y1 - 2014 U6 - https://doi.org/http://dx.doi.org/10.1016/j.ecoleng.2014.06.011 SN - 0925-8574 IS - 70 SP - 477 EP - 482 ER - TY - GEN A1 - Puppe, Daniel A1 - Ehrmann, Otto A1 - Kaczorek, Danuta A1 - Wanner, Manfred A1 - Sommer, Michael T1 - The protozoic Si pool in temperate forest ecosystems - quantification, abiotic controls and interactions with earthworms T2 - Geoderma Y1 - 2015 SN - 0016-7061 IS - 243-244 SP - 196 EP - 204 ER - TY - GEN A1 - Puppe, Daniel A1 - Höhn, Axel A1 - Kaczorek, Danuta A1 - Wanner, Manfred A1 - Sommer, Michael T1 - As time goes by—Spatiotemporal changes of biogenic Si pools in initial T2 - Applied Soil Ecology N2 - Accumulation and recycling of biogenic silicon (BSi) in terrestrial ecosystems influence fluxes of dissolved Si from the continents to the oceans, thus act as a filter in the global Si cycle. Although the biogenic control mechanism especially of phytogenic Si pools (phytoliths) has been generally recognized since decades quantitative information on other terrestrial BSi pools is surprisingly rare. For the first time terrestrial protophytic (diatom frustules), protozoic (testate amoeba shells) and zoogenic (sponge spicules) Si pools were quantified in soils of initial ecosystem states. We analyzed spatiotemporal changes of these Si pools in differently aged soils of the artificial catchment ‘Chicken Creek’ in NE Germany. Within a relatively short time span (<10 years) of ecosystem development protophytic, protozoic and zoogenic Si pool sizes increased markedly, whereat protozoic Si pools were the smallest ones with a maximum of 6.2 mg m−2. Zoogenic Si pool size (max. 22.6 mg m−2) is comparable to the one of protophytic Si pools (max. 30.5 mg m−2) although only few sponge spicules (n = 10) and spicule fragments (n = 2) were found. Differences in quantities, dynamics and resistibility against dissolution of various BSi pools indicate their possibility to influence biogeochemical Si cycling relatively rapid (protophytic and protozoic Si pools) or slow (zoogenic Si pool). Spatiotemporal changes of protophytic and protozoic Si pools within the first decade of ecosystem development seem to be mainly controlled by (biotic) small-scale environmental conditions (e.g., vegetation, food sources). Y1 - 2016 U6 - https://doi.org/10.1016/j.apsoil.2016.01.020 SN - 0929-1393 VL - 105 SP - 9 EP - 16 ER - TY - GEN A1 - Puppe, Daniel A1 - Höhn, Axel A1 - Kaczorek, Danuta A1 - Wanner, Manfred A1 - Wehrhan, Marc A1 - Sommer, Michael T1 - How big is the influence of biogenic silicon pools on short-term changes in water-soluble silicon in soils? Implications from a study of a 10-year-old soil–plant system T2 - Biogeosciences Y1 - 2017 SN - 1726-4189 SN - 1726-4170 VL - 14 IS - 22 SP - 5239 EP - 5252 ER - TY - GEN A1 - Sommer, Michael A1 - Höhn, Axel A1 - Breuer, Jörn A1 - Zagorski, Zbigniew A1 - Busse, J. A1 - Barkusky, Dietmar A1 - Meier, K. A1 - Puppe, Daniel A1 - Wanner, Manfred A1 - Kaczorek, Danuta T1 - Si cycling in a forest biogeosystem – the importance of transient state biogenic Si pools T2 - Biogeosciences Y1 - 2013 SN - 1726-4189 VL - 10 IS - 7 SP - 4991 EP - 5007 ER -