| The effects of throughfall manipulation on soil leaching in a deciduous forest. | |
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MedLine Citation:
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PMID: 11837424 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of changing precipitation on soil leaching in a deciduous forest were examined by experimentally manipulating throughfall fluxes in the field. In addition to an ambient treatment (AMB), throughfall fluxes were reduced by 33% (DRY treatment) and increased by 33% (WET treatment) using a system of rain gutters and sprinklers on Walker Branch Watershed, Tennessee. Soil leaching was measured with resin lysimeters in the O horizons and with ceramic cup lysimeters in the E (25 cm) and Bt (70 cm) horizons. Large and statistically significant treatment effects on N fluxes were found in the O horizons (lower N fluxes in the DRY and higher N fluxes in the WET treatment). Together with the greater O horizon N content observed in the DRY treatment, this suggested that N was being immobilized at a greater rate in the DRY treatment than in the AMB or WET treatments. No statistically significant treatment effects on soil solution were found in the E horizons with the exception of (Ca2+ + Mg2+) to K+ ratio. Statistically significant treatment effects on electrical conductivity (EC), pH, Ca2+, Mg2+, K+, Na+, SO4(2-), and Cl- were found in the Bt horizons due to differences between the DRY and other treatments. Despite this, calculated fluxes of Ca2+, Mg2+, K+, Na+, SO4(2-), and Cl- were lowest in the DRY treatment. These results suggest that lower precipitation will cause temporary N immobilization in litter and long-term enrichment in soil base cations whereas increased precipitation will cause long-term depletion of soil base cations. |
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Authors:
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D W Johnson; P J Hanson; D E Todd |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of environmental quality Volume: 31 ISSN: 0047-2425 ISO Abbreviation: J. Environ. Qual. Publication Date: 2002 Jan-Feb |
Date Detail:
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Created Date: 2002-02-11 Completed Date: 2002-07-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0330666 Medline TA: J Environ Qual Country: United States |
Other Details:
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Languages: eng Pagination: 204-16 Citation Subset: IM |
Affiliation:
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Environmental and Resource Sciences, Univ. of Nevada, Reno 89557, USA. dwj@unr.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Cations Environmental Monitoring* Nitrogen / analysis* Plant Leaves / chemistry Rain Soil Pollutants / analysis* Trees* Water Movements |
| Chemical | |
Reg. No./Substance:
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0/Cations; 0/Soil Pollutants; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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