Dissolved Organic Matter (DOM) in Natural Environments

Frimmel, Fritz H.; Abbt‐Braun, Gudrun

doi:10.1002/9780470494950.ch10

Cited by 5 publications

(3 citation statements)

References 157 publications

(125 reference statements)

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“…The average DOC was 1.8 mg•L −1 and confirms that the lake is oligotrophic [40]. The DOC concentrations are in the range of those along the Langtang Narayani river system in central Nepal Himalaya except for few places which have enhanced values due to input from forested landscape, they are about three times less than the DOC concentration in the Taudaha pond within Kathmandu valley and ten times less than the heavily urbanized Bagmati river system within Kathmandu valley [41]- [44].…”

Section: Spatial Variation In Doc Tdn and Dic Speciesmentioning

confidence: 61%

“…All inorganic carbon species showed increasing concentration from GKS 1 to GKS 10 except for carbonate (CO 3 ). Such decrease in concentration of carbonate is directly linked with the neutralization processes of the acid products by the alkaline limestones [38] [40]. The authors observed clear trend of increase in partial pressure of carbon dioxide (pCO 2 ) with decrease in carbonate within the Gosikunda lake (Figure 6(c)).…”

Section: Spatial Variation In Doc Tdn and Dic Speciesmentioning

confidence: 90%

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Controls on Gosaikunda Lake Chemistry within Langtang National Park in High Himalaya, Nepal

Bhatt¹,

Bhatt²,

Gaye³

2014

IJG

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Surface water samples and lake bed sediments were collected and analyzed from Gosaikunda Lake within Langtang National Park (28˚05'N, 85˚25'E; 4380 m a.s.l.) in the central Himalayan region of Nepal during fall 2011. The major cations and anions in equivalents were present in the following order:, respectively. Sulfide oxidation coupled with carbonate dissolution and aluminosilicate dissolution appeared to be the dominant geochemical processes determining lake water dissolved ions. Sulfate concentration was much higher than the alkalinity which is in contrast to glacier meltwater within the same landscape. Alkalinity primarily as bicarbonate contributes 88.6% to the total dissolved inorganic carbon (DIC) followed by carbon dioxide (CO 2 ) and carbonate (CO 3 ) in surface water samples. Organic carbon contributes 0.3% to 5.4% to the sediments and the organic matter is predominantly of aquatic origin. The lake is under saturated with carbon dioxide and the average partial pressure of carbon dioxide (pCO 2 ) appeared quite low (43.4 µatm). Overall, natural biogeochemical processes regulate the chemical species within the lake ecosystem. The lake is oligotrophic, however, nutrients and dissolved organic carbon (DOC) concentrations are enhanced at the near shore sites close to the tracking trail.

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Section: Spatial Variation In Doc Tdn and Dic Speciesmentioning

confidence: 61%

Section: Spatial Variation In Doc Tdn and Dic Speciesmentioning

confidence: 90%

Controls on Gosaikunda Lake Chemistry within Langtang National Park in High Himalaya, Nepal

Bhatt¹,

Bhatt²,

Gaye³

2014

IJG

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“…Extracting metabolic pathway information from DOM will lead to an increased specificity in targeting the coupling between DOM and microbial communities, which will help in separating autochthonous stimulation from transport effects (Anantharaman et al, 2016;Bomberg et al, 2016). Advances in assessing these links between DOM and microbial communities in the CZ will aid future management of ecosystem services such as crop production and water quality as human demands on the environment are constantly increasing (Brantley et al, 2007;Frimmel and Abbt-Braun, 2009;Richter and Mobley, 2009).…”

Section: Resultsmentioning

confidence: 99%

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

et al. 2019

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Surface ecosystems are rapidly changing on a global scale and it is important to understand how this influences aquifers in the subsurface, as groundwater quality is a major concern for future generations. Dissolved organic matter (DOM) contains molecular and isotopic signals from surface-derived inputs as well as from the biotic and abiotic subsurface environment and is therefore ideal to study the connectivity between both environments. We evaluated a 3-year time series of DOM composition using ultrahigh resolution mass spectrometry and age using 14 C accelerator mass spectrometry along a hillslope well transect in the fractured bedrock of the Hainich Critical Zone Exploratory, Germany. We found a wide range of DOM 14 C depletion, from 14 C = −47.9 to 14 C = −782.4, within different zones of the shallow groundwater. The 14 C content of DOM mirrored the connectivity of the aquifers to the surface. The composition of DOM was highly interrelated with its 14 C age. The proportions of surface-derived DOM components decreased with DOM age, whereas microorganismderived DOM components increased. The intensity of surface-sourced DOM signals differed between the wells and likely reflected the hydrological complexity of fracturedrock environments. During recharge, DOM was more enriched in 14 C, contained more surface-derived molecular components and was more diverse. As a potential response to the varying DOM substrate, bacterial 16S rRNA gene analysis revealed community evolution and increased bacterial diversity during recharge. The influx of diverse, surface-derived DOM potentially fueled evolution within the autochthonous bacterial communities, as in contrast to DOM, the bacterial community did not retreat to the initial diversity and community composition during the recession period. Our results demonstrate on the one hand that combined analyses of the composition and age of groundwater DOM strongly contribute to the understanding of interconnections, community evolution and the functioning of subsurface ecosystems and on the other hand that changes in surface ecosystems have an imprint on subsurface ecosystems.

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Soil–root cross‐talking: The role of humic substances

Nardi

Ertani

Francioso

2016

J. Plant Nutr. Soil Sci.

100

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The biological activity of humic substances (HS) has been elucidated in the last 40 years. Growth enhancement from HS has been demonstrated in several plants in the laboratory and the field. Morphogenesis effects have also been investigated and include induction of lateral root formation and root hair initiation in intact plants and stimulation of root and shoot development in treated cell calluses. HS enhance nutrient use efficiency, aiding assimilation of both macro and microelements and promoting plant growth by the induction of carbon, nitrogen, and secondary metabolism. The review aims are to: (1) shed light on the mechanism by which plants “talk” with soil through humic substances, (2) elucidate the plant responses to the stimulatory effects of HS, the regulatory circuits that allow plants to cope with humus, and the feedback between plant community structures, and (3) show (in light of recent debate about the alkaline extraction of soil humic substances) the plant capability to acquire biologically active substances from soil. It will be shown that plants modify soils, creating and maintaining favorable habitats for growth and survival. Therefore, organic substances exuded by roots are not a wasteful loss of carbon and energy. They represent an evolved strategy by which plants “talk” to the soil. The mobilization of bioactive organic/humic substances from bulk soil or bulk humus is critical to plant and soil health.

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Dissolved Organic Matter (DOM) in Natural Environments

Cited by 5 publications

References 157 publications

Controls on Gosaikunda Lake Chemistry within Langtang National Park in High Himalaya, Nepal

Controls on Gosaikunda Lake Chemistry within Langtang National Park in High Himalaya, Nepal

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

Soil–root cross‐talking: The role of humic substances

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