Dissolved organic carbon from the forest floor with different decomposition rates in a rainforest in south-eastern Brazil

Soil Research ◽  
2021 ◽  
Author(s):  
Felipe Soter de Mariz e Miranda ◽  
André de Souza Avelar
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Forest Floor ◽  
Decomposition Rates ◽  
South Eastern ◽  
Eastern Brazil

Climatic factors influencing fluxes of dissolved organic carbon from the forest floor in a continuous-permafrost Siberian watershed

2005 ◽  
Vol 35 (9) ◽  
pp. 2130-2140 ◽  
Author(s):  
A S Prokushkin ◽  
T Kajimoto ◽  
S G Prokushkin ◽  
W H McDowell ◽  
A P Abaimov ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Forest Floor ◽  
Climatic Factors ◽  
Soil Layer ◽  
The South ◽  
The North ◽  
Doc Production ◽  
Doc Flux ◽  
Forest Floor Leachates

Fluxes of dissolved organic carbon (DOC) in forested watersheds underlain by permafrost are likely to vary with changes in climatic regime that increase soil moisture and temperature. We examined the effects of temporal and spatial variations in soil temperature and moisture on DOC fluxes from the forest floor of contrasting north- and south-facing slopes in central Siberia. DOC fluxes increased throughout the growing season (June–September) on both slopes in 2002 and 2003. The most favorable combination of moisture content and temperature (deepest active soil layer) occurred in September, and we believe this was the primary driver of increased DOC concentrations and flux in autumn. Total DOC flux for June–September was 12.6–17.6 g C·m–2 on the south-facing slope and 4.6–8.9 g C·m–2 on the north-facing slope. DOC concentrations in forest floor leachates increased with increasing temperature on the north-facing slope, but were almost unaffected by temperature on the south-facing slope. Our results suggest that water input in midseason from melting of ice or precipitation events is the primary factor limiting DOC production. Significant positive correlations between amounts of precipitation and DOC flux were found on both slopes. Dilution of DOC concentrations by high precipitation volumes was observed only for the forest floor leachates collected from the north-facing slope. Our results suggest that global warming will result in increased DOC production in forest floors of permafrost regions, and that precipitation patterns will play an important role in determining the magnitude of these changes in DOC flux as well as its interannual variability. However, the longer-term response of soils and DOC flux to a warming climate will be driven by changes in vegetation and microbial communities as well as by the direct results of temperature and moisture conditions.

Dissolved Organic Carbon Leaching from a Coniferous Forest Floor -- A Field Manipulation Experiment

2005 ◽  
Vol 75 (2) ◽  
pp. 271-287 ◽  
Author(s):  
Mats Fröberg ◽  
Dan Berggren Kleja ◽  
Bo Bergkvist ◽  
Edward Tipping ◽  
Jan Mulder
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Forest Floor ◽  
Coniferous Forest ◽  
Field Manipulation Experiment ◽  
Field Manipulation ◽  
Manipulation Experiment

scholarly journals Patterns of dissolved organic carbon and nitrogen fluxes in deciduous and coniferous forests under historic high nitrogen deposition

2009 ◽  
Vol 6 (12) ◽  
pp. 2743-2758 ◽  
Author(s):  
S. Sleutel ◽  
J. Vandenbruwane ◽  
A. De Schrijver ◽  
K. Wuyts ◽  
B. Moeskops ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Nitrogen Deposition ◽  
Soil Solution ◽  
Forest Floor ◽  
Inorganic Nitrogen ◽  
Mineral Soil ◽  
N Deposition ◽  
High Nitrogen ◽  
Leaching Losses

Abstract. Numerous recent studies have indicated that dissolved organic carbon (DOC) and nitrogen (DON) play an important role in C and N cycling in natural ecosystems, and have shown that N deposition alters the concentrations and fluxes of dissolved organic substances and may increase leaching losses from forests. Our study was set up to accurately quantify concentrations and flux patterns of DOC, DON and dissolved inorganic nitrogen (DIN) in deciduous and coniferous forest in Flanders, Belgium, under historical high nitrogen deposition. We measured DOC, DON and DIN concentrations at two weekly intervals in a silver birch (SB) stand, a corsican pine (CP) stand and a pine stand with higher N deposition (CPN), and used the SWAP model (calibrated with PEST) for generating accurate water and matter fluxes. The input with precipitation was an important source of DON, but not for DOC. Release of DOC from the forest floor was minimally affected by forest type, but higher N deposition (CPN stand) caused an 82% increase of DOC release from the forest floor. Adsorption to mineral soil material rich in iron and/or aluminum oxyhydroxides was suggested to be the most important process removing DOC from the soil solution, responsible for substantial retention (67–84%) of DOC entering the mineral soil profile with forest floor leachate. Generally, DON was less reactive (i.e. less removal from the soil solution) than DOC, resulting in decreasing DOC/DON ratios with soil depth. We found increased DOC retention in the mineral soil as a result of higher N deposition (84 kg ha−1 yr−1 additional DOC retention in CPN compared to CP). Overall DON leaching losses were 2.2, 3.3 and 5.0 kg N yr−1 for SB, CP and CPN, respectively, contributing between 9–28% to total dissolved N (TDN) leaching. The relative contribution to TDN leaching from DON loss from SB and CP was mainly determined by (large) differences in DIN leaching. The large TDN leaching losses are alarming, especially in the CPN stand that was N saturated.

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