Document Detail

The effects of throughfall manipulation on soil leaching in a deciduous forest.
MedLine Citation:
PMID:  11837424     Owner:  NLM     Status:  MEDLINE    
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.
D W Johnson; P J Hanson; D E Todd
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of environmental quality     Volume:  31     ISSN:  0047-2425     ISO Abbreviation:  J. Environ. Qual.     Publication Date:    2002 Jan-Feb
Date Detail:
Created Date:  2002-02-11     Completed Date:  2002-07-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0330666     Medline TA:  J Environ Qual     Country:  United States    
Other Details:
Languages:  eng     Pagination:  204-16     Citation Subset:  IM    
Environmental and Resource Sciences, Univ. of Nevada, Reno 89557, USA.
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MeSH Terms
Environmental Monitoring*
Nitrogen / analysis*
Plant Leaves / chemistry
Soil Pollutants / analysis*
Water Movements
Reg. No./Substance:
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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