Biologic cycling of silica across a grassland bioclimosequence
Biologic cycling of silica across a grassland bioclimosequence
复制标题
DOI：
10.1029/2006gb002690
复制
发表时间：
2006-09-20
影响因子：
5.2
通讯作者：
Kelly, E. F.
中科院分区：
文献类型：
--
作者：
Blecker, S. W.;McCulley, R. L.;Kelly, E. F.
[1]草地生态系统中生物硅循环的动态在很大程度上是未知的，可能会影响矿物风化率区域和全球硅藻生产力;全球硅循环的关键调控过程与全球碳循环密切相关。在大平原主要草原生态系统的生物气候序列，土壤生物硅的深度分布是类似的土壤有机碳，但是，与土壤有机碳，土壤生物硅的数量随着降水量的增加而减少，尽管增加每年的生物输入通过凋落物在同一梯度。虽然仅占总硅库的1 - 3%，但生物硅的更快周转和草的年度循环应对矿物溶解产生积极影响。我们的研究结果表明，在陆地生态系统中，最大的水库生物硅驻留在土壤中，并强调草原在全球硅地球化学循环的潜在意义。
[1] The dynamics of biologic Si cycling in grassland ecosystems are largely unknown and likely to impact mineral weathering rates regionally and diatom productivity globally; key regulatory processes in the global Si cycle are closely tied to the global carbon cycle. Across a bioclimatic sequence spanning major grassland ecosystems in the Great Plains, soil biogenic silica depth distributions are similar to that of soil organic carbon; however, unlike soil organic carbon, quantities of soil biogenic silica decrease with increasing precipitation, despite an increase in annual biogenic inputs through litterfall across the same gradient. Though comprising only 1 - 3% of the total Si pool, faster turnover of biogenic Si and annual cycling by grasses should positively impact mineral dissolution. Our results suggest that the largest reservoir of biogenic Si in terrestrial ecosystems resides in soils, and emphasize the potential significance of grasslands in the global biogeochemical cycle of Si.