期刊
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
卷 122, 期 3, 页码 708-715出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JG003755
关键词
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资金
- A.W. Mellon Foundation
- USDA-Northeastern States Research Cooperative
- National Science Foundation
- Northeastern States Research Cooperative Northern Forest Scholars Program
- Sloan Foundation
- Hubbard Brook Ecosystem Study (HBES)
- Direct For Biological Sciences
- Division Of Environmental Biology [1633026] Funding Source: National Science Foundation
Winter temperatures are projected to increase over the next century, leading to reductions in winter snowpack and increased frequency of soil freezing in many northern forest ecosystems. Here we examine biogenic silica (BSi) concentrations in sugar maple (Acer saccharum) fine roots collected from a snow manipulation experiment at Hubbard Brook Experimental Forest (New Hampshire, USA). Increased soil freezing significantly lowered the BSi content of sugar maple fine roots potentially decreasing their capacity to take up water and dissolved nutrients. The reduced silica uptake (8 +/- 1 kmol silica km(-2)) by sugar maple fine roots is comparable to silica export from temperate forest watersheds. We estimate that fine roots account for 29% of sugar maple BSi, despite accounting for only 4% of their biomass. These results suggest that increased frequency of soil freezing will reduce silica uptake by temperate tree roots, thereby changing silica availability in downstream receiving waters.
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