Biologic cycling of silica across a grassland bioclimosequence

被引:240
作者
Blecker, S. W.
McCulley, R. L.
Chadwick, O. A.
Kelly, E. F.
机构
[1] Colorado State Univ, Dept Soil & Crop Sci, Ft Collins, CO 80521 USA
[2] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40506 USA
[3] Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA
关键词
D O I
10.1029/2006GB002690
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
[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.
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页数:11
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