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GEOREF RECORD

Response of dissolved organic matter in the forest floor of a temperate spruce stand to increasing throughfall

Thimo Klotzbuecher, Klaus Kaiser and Karsten Kalbitz
Response of dissolved organic matter in the forest floor of a temperate spruce stand to increasing throughfall (in Dissolved organic matter in soil, Boris Jansen (editor), Karsten Kalbitz (editor) and William H. McDowell (editor))
Vadose Zone Journal (July 2014) 13 (7)

Abstract

In temperate spruce forests, dissolved organic matter (DOM) from forest floors is the major source of organic matter entering the mineral soil and thus it determines important soil properties and element cycling through the ecosystem. We examined effects of doubling locally collected throughfall for 6 yr on the concentrations of dissolved organic C (DOC) and properties of DOM (aromaticity, degree of molecule complexity) in the forest floor. Forest floor solutions below the Oi, Oe, and Oa horizons were sampled every 2 to 4 wk using tension lysimeters. For the controls, the average DOC concentrations in 2002 to 2007 were 43.8 + or - 2.6 mg L (super -1) below the Oi, 49.6 + or - 2.7 mg L (super -1) below the Oe, and 61.0 + or - 2.0 mg L (super -1) below the Oa horizon. Doubling throughfall resulted in average DOC concentrations of 37.4 + or - 1.8 mg L (super -1) (Oi), 49.3 + or - 1.6 mg L (super -1) (Oe), and 50.1 + or - 8.0 mg L (super -1) (Oa). The decreases in concentrations due to throughfall addition as well as the effects on DOM properties were, however, not statistically significant. It is commonly assumed that throughfall inputs are linearly related to water fluxes within and from the forest floor. Under that assumption, the results suggest that DOM fluxes are controlled by water fluxes rather than by the quantity of C that can be mobilized from the soil organic matter. Hence, increasing precipitation due to future climate changes presumably will result in enhanced DOM fluxes into the mineral horizons.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 13
Serial Issue: 7
Title: Response of dissolved organic matter in the forest floor of a temperate spruce stand to increasing throughfall
Title: Dissolved organic matter in soil
Author(s): Klotzbuecher, ThimoKaiser, KlausKalbitz, Karsten
Author(s): Jansen, Boriseditor
Author(s): Kalbitz, Karsteneditor
Author(s): McDowell, William H.editor
Affiliation: Martin-Luther-University at Halle-Wittenberg, Soil Sciences, Halle, Germany
Affiliation: University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics, Amsterdam, Netherlands
Published: 201407
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
Number of pages: 5
References: 25
Accession Number: 2014-058255
Categories: General geochemistryEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N49°49'60" - N50°15'00", E11°40'00" - E12°19'60"
Secondary Affiliation: University of New Hampshire, Durham, NH, USA, United StatesUniversity of Amsterdam, NLD, Netherlands
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201431
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