Chemistry and transport of soluble humic substances in forested watersheds of the Adirondack Park, New York

Cronan, Christopher S.; Aiken, George R.

doi:10.1016/0016-7037(85)90140-1

Cited by 382 publications

(167 citation statements)

References 16 publications

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“…Significant peaks were observed in runoff collected after heavy rainfall and during intensive snowmelt. Such tendencies have been also reported in other studies (Cronan and Aiken, 1985;Hongve, 1999;Klimaszyk, 2006) indicating that the degree of chemical washing-out correlates with the volume of surface runoff. The DOC concentrations found in our study are comparable to its content in waters collected from transitional and raised bogs.…”

Section: Discussionsupporting

confidence: 84%

Catchment vegetation can trigger lake dystrophy through changes in runoff water quality

Klimaszyk

Rzymski

2013

Ann. Limnol. - Int. J. Lim.

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-Surface runoff can supply lakes with a variety of chemical substances -their type and quantity may significantly vary and depend on the characteristics of the catchment area: geomorphology, phytocoenosis type and degree of human impact. In this study we investigated the physicochemical properties of the surface runoff water collected from the wooded catchment of Lake Piaseczno Duze (LPD, Drawa National Park, Poland) covered by a monoculture of Scots pine (Pinus sylvestris) and mixed forest with white birch (Betula pubescens) as the dominant tree. Experimentally, we also aimed to study the leaching of nutrients from pine and birch litter. Throughout the investigated period runoff waters had low pH, brown colour and high levels of dissolved organic carbon (DOC) -most likely induced by humic acids. Furthermore, considerable levels of nitrogen (N) and phosphorus (P) were found. The highest concentrations of nutrients were observed in runoff collected after heavy rainfall and snow melting. Runoff from the coniferous area contained significantly higher levels of DOC but lower concentrations of N and P compared to runoff collected from the birch-dominated forest. Similar physicochemical conditions were observed in the leaching experiment. Moreover, it was found that the release of chemical substances from both coniferous and deciduous litter was rapid. Our study indicates that surface runoff from forest areas can significantly affect lake chemistry. Based on the simultaneous analyses of littoral water chemistry we suggest that it may contribute to LPD dystrophication through the transportation of high levels of acidic compounds.

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Section: Discussionsupporting

confidence: 84%

Catchment vegetation can trigger lake dystrophy through changes in runoff water quality

Klimaszyk

Rzymski

2013

Ann. Limnol. - Int. J. Lim.

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“…Fluxes of DOC generally decrease from the litter layer to deeper mineral hori-zons (Table 1). In virtually every soil with substantial clay content, DOC concentrations drop by 50%-90% from the surface organic layers to subsurface mineral soils (McDowell and Wood 1984;Cronan and Aiken 1985;Dalva and Moore 1991;Koprivnjak and Moore 1992;Dosskey and Bertsch 1997). Surface soil fluxes of DOC range from 10 to 85 g C m Ϫ2 y Ϫ1 ; below the surface horizons, they decline to 2-40 g C m Ϫ2 y Ϫ1 (Table 1).…”

Section: Model Generationmentioning

confidence: 99%

Dissolved Organic Carbon in Terrestrial Ecosystems: Synthesis and a Model

2001

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The movement of dissolved organic carbon (DOC) through soils is an important process for the transport of carbon within ecosystems and the formation of soil organic matter. In some cases, DOC fluxes may also contribute to the carbon balance of terrestrial ecosystems; in most ecosystems, they are an important source of energy, carbon, and nutrient transfers from terrestrial to aquatic ecosystems. Despite their importance for terrestrial and aquatic biogeochemistry, these fluxes are rarely represented in conceptual or numerical models of terrestrial biogeochemistry. In part, this is due to the lack of a comprehensive understanding of the suite of processes that control DOC dynamics in soils. In this article, we synthesize information on the geochemical and biological factors that control DOC fluxes through soils. We focus on conceptual issues and quantitative evaluations of key process rates to present a general numerical model of DOC dynamics. We then test the sensitivity of the model to variation in the controlling parameters to highlight both the significance of DOC fluxes to terrestrial carbon processes and the key uncertainties that require additional experiments and data. Simulation model results indicate the importance of representing both root carbon inputs and soluble carbon fluxes to predict the quantity and distribution of soil carbon in soil layers. For a test case in a temperate forest, DOC contributed 25% of the total soil profile carbon, whereas roots provided the remainder. The analysis also shows that physical factors-most notably, sorption dynamics and hydrology-play the dominant role in regulating DOC losses from terrestrial ecosystems but that interactions between hydrology and microbial-DOC relationships are important in regulating the fluxes of DOC in the litter and surface soil horizons. The model also indicates that DOC fluxes to deeper soil layers can support a large fraction (up to 30%) of microbial activity below 40 cm.

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“…Litaor and Thurman (1988) studied soil water humic substances (corresponding to our HoA) leached from alpine tundra forest floor and recorded values of 6.3 to 11.3 }Lmol e mg-1 C. Cronan and Aiken (1985), who studied the organic layer leachate at North U.S. Spodosol sites, reported values of 6.5 }Lmol e mg-1 C for the whole DOM and 7.5 }Lmole mg-1 C for the acidic fraction. There are few reports on the values of HiA.…”

Section: Carboxylic Groups In Dommentioning

confidence: 95%

“…Hydrophobic acids are often referred to as aquatic fulvic acids, and are composed of oxidized plant-derived materials (Guggenberger et al 1994); hydrophilic acids contain a large number of low-molecular-weight acids, and originate from both microbial metabolites and highly oxidized plant-derived materials. Cronan and Aiken (1985), who adopted this fractionation method in the study of forest soils in Northern U.S., reported that DOM under organic layers consisted of 46% hydrophobic acids and 40% hydrophilic acids. They did not detect any difference in the DOM composition between hardwood and coniferous sites, though the total DOM concentration was higher at the coniferous sites.…”

mentioning

confidence: 99%

Acidic properties of dissolved organic matter leached from organic layers in temperate forests

Nambu¹,

Yonebayashi²

1999

Soil Science and Plant Nutrition

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Chemistry and transport of soluble humic substances in forested watersheds of the Adirondack Park, New York

Cited by 382 publications

References 16 publications

Catchment vegetation can trigger lake dystrophy through changes in runoff water quality

Catchment vegetation can trigger lake dystrophy through changes in runoff water quality

Dissolved Organic Carbon in Terrestrial Ecosystems: Synthesis and a Model

Acidic properties of dissolved organic matter leached from organic layers in temperate forests

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