Factors influencing the release of dissolved organic carbon and dissolved forms of nitrogen from a small upland headwater during autumn runoff events

Cooper, Richard J.; Thoss, Vera; Watson, Helen

doi:10.1002/hyp.6261

Cited by 44 publications

(65 citation statements)

References 43 publications

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“…Results indicated a significant influence of discharge on DOC concentrations, shown also in many other studies (Cooper et al, 2007;Grieve, 1994;Hope et al, 1994;Worrall et al, 2002). Cooper et al (2007) and Worrall et al (2002) described the importance of the amount of water flowing through soils and its transit time for flushing C out of soils.…”

Section: Dissolved Organic Carbon (Doc)supporting

confidence: 66%

“…These studies reported increasing concentrations in Scottish landscapes from June to November and from May to June, respectively. The early autumn is considered to be the time of maximum DOC export (Cooper et al, 2007;Grieve, 1984;Worrall et al, 2004). The rising trend can result from increasing soil temperature and moisture which are driving factors for decomposition.…”

Section: Dissolved Organic Carbon (Doc)mentioning

confidence: 99%

“…Due to the same organic matter origin and similar organic components, DON is often closely linked to the C cycle (Campbell et al, 2000;Cooper et al, 2007;Ghani et al, 2007;Goodale et al, 2000;van Kessel et al, 2009;Willett et al, 2004). Accordingly, it is assumed that DON and DOC should be equally influenced by soil type or land use.…”

Section: Dissolved Organic Carbon (Doc)mentioning

confidence: 99%

“…Recently, researchers have put more emphasis on studying the contribution of dissolved organic nitrogen (DON) to the N balance of landscapes (Mattson et al, 2009;Cooper et al, 2007;Ghani et al, 2007;van Kessel et al, 2009;Neff et al, 2003. Hedin et al (1995) found that organic N represents a large part of the total N losses from forest ecosystems, which was also described in other studies (van Breemen, 2002;Cooper et al, 2007;van Kessel et al, 2009;Neff et al, 2003. It was also found that DON can be used as N source by many plant species (Näsholm et al, 2009) and therefore could also play a substantial role in N flows of agricultural systems.…”

mentioning

confidence: 99%

“…It was also found that DON can be used as N source by many plant species (Näsholm et al, 2009) and therefore could also play a substantial role in N flows of agricultural systems. Cooper et al (2007) pointed out that the release of DON (and DOC) is "strongly influenced by a wide range of hydrometeorological factors". As DON includes labile and recalcitrant compounds (Neff et al, 2003) and has different retention times in soil and water, corresponding losses can substantially vary between different watersheds.…”

mentioning

confidence: 99%

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Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

Wohlfart¹,

Exbrayat

Schelde

et al. 2012

Biogeosciences

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Abstract. The surrounding landscape of a stream has crucial impacts on the aquatic environment. This study pictures the hydro-biogeochemical situation of the Tyrebaekken creek catchment in central Jutland, Denmark. The intensively managed agricultural landscape is dominated by rotational croplands. The small catchment mainly consist of sandy soil types besides organic soils along the streams. The aim of the study was to characterise the relative influence of soil type and land use on stream water quality. Nine snapshot sampling campaigns were undertaken during the growing season of 2009. Total dissolved nitrogen (TDN), nitrate (NO − 3 ), ammonium nitrogen and dissolved organic carbon (DOC) concentrations were measured, and dissolved organic nitrogen (DON) was calculated for each grabbed sample. Electrical conductivity, pH and flow velocity were measured during sampling. Statistical analyses showed significant differences between the northern, southern and converged stream parts, especially for NO − 3 concentrations with average values between 1.4 mg N l −1 and 9.6 mg N l −1 . Furthermore, throughout the sampling period DON concentrations increased to 2.8 mg N l −1 in the northern stream contributing up to 81 % to TDN. Multiple-linear regression analyses performed between chemical data and landscape characteristics showed a significant negative influence of organic soils on instream N concentrations and corresponding losses in spite of their overall minor share of the agricultural land (12.9 %). On the other hand, organic soil frequency was positively correlated to the corresponding DOC concentrations. Croplands also had a significant influence but with weaker correlations. For our case study we conclude that the fractions of coarse textured and organic soils have a major influence on N and DOC export in this intensively used landscape. Meanwhile, the contribution of DON to the total N losses was substantial.

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Section: Dissolved Organic Carbon (Doc)supporting

confidence: 66%

Section: Dissolved Organic Carbon (Doc)mentioning

confidence: 99%

Section: Dissolved Organic Carbon (Doc)mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

Wohlfart¹,

Exbrayat

Schelde

et al. 2012

Biogeosciences

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Pulse of dissolved organic matter alters reciprocal carbon subsidies between autotrophs and bacteria in stream food webs

Demars

Friberg

Thornton

2020

Ecological Monographs

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Citation: Demars, B. O. L., N. Friberg, and B. Thornton. 2020. Pulse of dissolved organic matter alters reciprocal carbon subsidies between autotrophs and bacteria in stream food webs. Ecological Monographs 90(1):Abstract. Soils are currently leaching out dissolved organic matter (DOM) at an increasing pace due to climate and land use change or recovery from acidification. The implications for stream biogeochemistry and food webs remain largely unknown, notably the metabolic balance (biotic CO 2 emissions) and carbon cycling between autotrophs and bacteria. We increased by 12% the flux of DOM in a stream for three weeks to mimic a pulse of natural DOM supply from soils rich in organic matter. We were able to track its fate into the food web through the use of a before and after control impact experimental design and the addition of DOM with a distinctive d 13 C signature. We used whole-stream metabolism to quantify carbon fluxes. Both photosynthesis and heterotrophic respiration increased rapidly following C addition, but this was short lived, likely due to nutrient limitations. Carbon exchange between autotrophs and bacteria in the control stream accounted for about 49% of bacterial production and 37% of net primary production, under stable flow conditions. Net primary production relied partly (19% in the control) on natural allochthonous dissolved organic carbon via the CO 2 produced by bacterial respiration, intermingling the green and brown webs. The preferential uptake of labile carbon by bacteria and excess bacterial CO 2 relative to nutrients (N, P) for autotrophs shifted the reciprocal carbon exchange between bacteria and autotrophs to a predominantly one-way carbon flow from bacteria to autotrophs, increasing the C:N:P molar ratios of autotrophs, the latter likely to become less palatable to consumers. The bacterial response to sucrose addition shifted the metabolic balance toward heterotrophy increasing biotic CO 2 emissions (+125%), shortened the average distance travelled by a molecule of organic matter (À40%), and thus provided less organic matter of lower quality for downstream ecosystems. Even a small increase in labile dissolved organic matter supply due to climate and land use change could significantly alter in-stream carbon cycling, with large effects on stream food web and biogeochemistry in small streams draining catchments with soils rich in organic carbon.

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Lessons from the 2018 drought for management of local water supplies in upland areas: A tracer‐based assessment

Fennell

Geris

Wilkinson

et al. 2020

Hydrological Processes

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Climate change, combined with industrial growth and increasing demand, could result in serious future water shortages and related water quality and temperature issues, especially for upland and humid areas. The extreme 2018 drought that prevailed throughout Europe provided an opportunity to investigate conditions likely to become more frequent in the future. For an upland rural catchment utilised by the distilling industry in NorthEast Scotland, a tracer-based survey combined discharge, electrical conductivity, stable water isotopes and temperature measurements to understand the impacts of drought on dominant stream water and industry water sources, both in terms of water quantity and quality (temperature). Results showed that water types (groundwater, ephemeral stream water, perennial stream water and water from small dams) were spatially distinct and varied more in space than time. With regards to the drought conditions we found that streams were largely maintained by groundwater during low flows. This also buffered stream water temperatures. Water types with high young water fractions were less resilient, resulting in streams with an ephemeral nature. Although our results demonstrated the importance of groundwater for drought resilience, water balance data revealed these storage reserves were being depleted and only recovered towards the end of the following year because of above average rainfall in 2019. Increased storage depletion under continued trends of extreme drought and water abstraction could be addressed via informed (nature based) management strategies which focus on increasing recharge. This may improve resilience to droughts as well as floods, but site specific testing and modelling are required to understand their potential. Results could have implications for management of water volumes and temperature, particularly for the sustainability of an historic industry, balancing requirements of rural communities and the environment.

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Factors influencing the release of dissolved organic carbon and dissolved forms of nitrogen from a small upland headwater during autumn runoff events

Cited by 44 publications

References 43 publications

Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

Pulse of dissolved organic matter alters reciprocal carbon subsidies between autotrophs and bacteria in stream food webs

Lessons from the 2018 drought for management of local water supplies in upland areas: A tracer‐based assessment

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