@misc{EhrmannPuppeWanneretal., author = {Ehrmann, Otto and Puppe, Daniel and Wanner, Manfred and Kaczorek, Danuta and Sommer, Michael}, title = {Testate amoebae in 31 mature forest ecosystems - densities and micro-distribution in soils}, series = {European Journal of Protistology}, volume = {48}, journal = {European Journal of Protistology}, number = {3}, issn = {1618-0429}, pages = {161 -- 168}, language = {en} } @misc{PuppeKaczorekWanneretal., author = {Puppe, Daniel and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {Dynamics and drivers of the protozoic Si pool along a 10-year chronosequence of initial ecosystem states}, series = {Ecological Engineering}, journal = {Ecological Engineering}, number = {70}, issn = {0925-8574}, doi = {http://dx.doi.org/10.1016/j.ecoleng.2014.06.011}, pages = {477 -- 482}, abstract = {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.}, language = {en} } @misc{PuppeEhrmannKaczoreketal., author = {Puppe, Daniel and Ehrmann, Otto and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {The protozoic Si pool in temperate forest ecosystems - quantification, abiotic controls and interactions with earthworms}, series = {Geoderma}, journal = {Geoderma}, number = {243-244}, issn = {0016-7061}, pages = {196 -- 204}, language = {en} } @misc{PuppeHoehnKaczoreketal., author = {Puppe, Daniel and H{\"o}hn, Axel and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {As time goes by—Spatiotemporal changes of biogenic Si pools in initial}, series = {Applied Soil Ecology}, volume = {105}, journal = {Applied Soil Ecology}, issn = {0929-1393}, doi = {10.1016/j.apsoil.2016.01.020}, pages = {9 -- 16}, abstract = {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).}, language = {en} } @misc{PuppeHoehnKaczoreketal., author = {Puppe, Daniel and H{\"o}hn, Axel and Kaczorek, Danuta and Wanner, Manfred and Wehrhan, Marc and Sommer, Michael}, title = {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}, series = {Biogeosciences}, volume = {14}, journal = {Biogeosciences}, number = {22}, issn = {1726-4189}, pages = {5239 -- 5252}, language = {en} } @misc{SommerHoehnBreueretal., author = {Sommer, Michael and H{\"o}hn, Axel and Breuer, J{\"o}rn and Zagorski, Zbigniew and Busse, J. and Barkusky, Dietmar and Meier, K. and Puppe, Daniel and Wanner, Manfred and Kaczorek, Danuta}, title = {Si cycling in a forest biogeosystem - the importance of transient state biogenic Si pools}, series = {Biogeosciences}, volume = {10}, journal = {Biogeosciences}, number = {7}, issn = {1726-4189}, pages = {4991 -- 5007}, language = {en} }