As time goes by—Spatiotemporal changes of biogenic Si pools in initial soils of an artificial catchment in NE Germany

As time goes by—Spatiotemporal changes of biogenic Si pools in initial soils of an artificial catchment in NE Germany
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随着时间的推移,德国东北部人工流域初始土壤中生物硅库的时空变化

DOI:
10.1016/j.apsoil.2016.01.020
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发表时间:
2016
影响因子:
4.8
通讯作者:
Sommer
Sommer
中科院分区:
农林科学2区
文献类型:
--
作者:
Kaczorek;Wanner;Sommer

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生物硅在陆地生态系统中的积累和循环影响着溶解硅从大陆到海洋的通量,从而在全球硅循环中起到过滤器的作用。尽管生物成因控制机制,特别是植物成因硅库(植硅体)几十年来已被普遍认识,但有关其他陆地生物硅库的定量信息却令人惊讶地稀少。首次在生态系统初始状态的土壤中对陆生原生生物(硅藻小管)、原生动物(种皮阿米巴壳)和动物源(海绵针状体)硅库进行了量化。我们分析了这些硅库在德国东北部人工集水区‘鸡溪’不同年龄土壤中的时空变化。在生态系统发育的较短时间内(10年),原生、原生和动物源硅池的大小显著增加,其中原生硅池最小,最大只有6.2mgm−2。22.6mgm−2)与原生硅池(max.3 0.5mgm−2),但仅见少量海绵毛刺(n=10)和毛刺碎片(n=2)。不同生物硅质库在数量、动力学和抗溶解能力上的差异表明,它们可能影响相对快速(原生和原生生物硅库)或较慢(动物源硅库)的生物地球化学硅循环。在生态系统发展的第一个十年内,原生和原生硅库的时空变化似乎主要受(生物)小尺度环境条件(如植被、食物来源)的控制。
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).
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