Dynamics and drivers of the protozoic Si pool along a 10-year chronosequence of initial ecosystem states
Dynamics and drivers of the protozoic Si pool along a 10-year chronosequence of initial ecosystem states
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DOI：
10.1016/j.ecoleng.2014.06.011
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发表时间：
2014-09
影响因子：
3.8
通讯作者：
Daniel Puppe;D. Kaczorek;M. Wanner;M. Sommer
中科院分区：
文献类型：
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作者：
Daniel Puppe;D. Kaczorek;M. Wanner;M. Sommer
生物源硅池的大小和动态影响着从陆地到水生生态系统的硅通量。目前的研究重点是植物在硅循环中的作用。近年来对古林的研究表明，异体雄性变形虫的年生物硅化速率（即TA产生自分泌的二氧化硅壳）与树木吸收硅的顺序相同。然而，没有初始生态系统的可比数据。我们分析了德国勃兰登堡矿区开采后10年的原生代BSi池（独特体TA）、相应的年生物硅化速率以及易溶态和非晶态Si组分。单株硅库含量在3 ~ 680 g Si / m2之间，植被区硅库含量是未覆盖区硅库含量的3 ~ 4倍。它们随着年龄的增长而显著增加，并与土壤化学性质的时间变化有关。对年生物硅化的计算结果表明，最大值在2 ~ 16 kg Si ha - 1之间，在植被点的速率总是更高。结果表明，独特体TA的BSi库在生态系统发育初期迅速建立，与植物生长密切相关。此外，我们的研究结果强调了TA对年轻人工生态系统中Si循环的重要性。
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−1and 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−1with 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.