Effect of upland pasture improvement on nutrient release in flow from a ‘natural’ lysimeter and a field drain

Roberts, G.; Hudson, J.A.; Blackie, J.R.

doi:10.1016/0378-3774(86)90041-7

Cited by 17 publications

(8 citation statements)

References 11 publications

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“…The superposition of hydrological and management effects are probably the reason why the wet conditions from June 2007 to April 2008 were not reflected by decreasing NO 3 -N losses from the catchment. Our values are lower than those of the lysimeter studies of Behrendt et al (1996) and Roberts et al (1986), who measured annual losses of more than 100 kg NO 3 -N ha −1 . These higher values might be explained by the methodological differences and, in the case of Roberts et al (1996), much higher precipitation.…”

Section: Doc and Nitrogen Lossescontrasting

confidence: 78%

“…Due to the transit through saturated zones of peat depleted in oxygen, sometimes even in agriculturally used catchments, especially under acidic soil conditions, low concentrations of NO 3 -N were measured (Frank et al, 2014;Sapek et al, 2007;van Beek et al, 2007). Due to the tile drains which have previously been found to carry high NO 3 -N concentrations (Roberts et al, 1986), the responsible processes do not fully work here. This interpretation is supported by lysimeter studies which also lack a prolonged transfer through the saturated zone.…”

Section: Controls On Doc and N Dynamics In The Ditchmentioning

confidence: 97%

“…Ploughingup of grassland can lead to mobilisation of nitrate even from mineral soils (Sheperd et al, 2001). In an upland pasture on peat, nitrate losses were increased by around 70 % even three years after ploughing and reseeding (Roberts et al, 1986). Secondly, the summer of 2007 was exceptionally wet (Table 2), which caused farmers to renew the ditches and some of the tile drains.…”

Section: Controls On Doc and N Dynamics In The Ditchmentioning

confidence: 99%

“…In heavily drained peatlands under intensive grassland use, net N mineralisation rates > 200 kg N ha −1 a −1 have been measured (Okruszko, 1989;Van Beek et al, 2007). However, many of these studies have been conducted on the scale of lysimeters Roberts et al, 1986;Ross et al, 1995) or soil cores (Cabezas et al, 2012;Martin et al, 1997;Olde Venterink et al, 2002). The actual NO − 3 losses depend on the water pathways, and denitrification during the passage of nitraterich water through zones of saturated peat might reduce the amount of NO − 3 reaching surface water bodies (Sapek et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen and dissolved organic carbon (DOC) losses from an artificially drained grassland on organic soils

Tiemeyer¹,

Kahle

2014

Biogeosciences

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Abstract. -N) as well as dissolved organic carbon (DOC) and nitrogen (DON) concentrations and losses were studied for three and two years, respectively, in a small catchment dominated by a degraded peatland used as intensive grassland. Concentrations in the shallow groundwater were spatially and temporally very variable, with NO 3 -N being the most dynamic component . Ditch DOC concentration were lower than the groundwater DOC concentration of 50.6 ± 15.2 mg L −1 (14.9 to 88.5 mg L −1 ). Both DOC and N concentrations were governed by hydrological conditions, but NO 3 -N reacted much faster and clearer on rising discharge rates than DOC, which tended to be higher under drier conditions. In the third year of the study, the superposition of a very wet summer and land use changes from grassland to arable land in a part of the catchment suggests that, under re-wetting conditions with a high groundwater table in summer, NO 3 -N would diminish quickly, while DOC would remain on a similar level. Further intensification of the land use, on the other hand, would increase N losses to receiving water bodies.

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Section: Doc and Nitrogen Lossescontrasting

confidence: 78%

Section: Controls On Doc and N Dynamics In The Ditchmentioning

confidence: 97%

Section: Controls On Doc and N Dynamics In The Ditchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrogen and dissolved organic carbon (DOC) losses from an artificially drained grassland on organic soils

Tiemeyer¹,

Kahle

2014

Biogeosciences

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“…In the wetland hollows the peat soils have deeper profiles (>0.6 m). In the mid 1970s, lower parts of the Gwy moorland catchment (down stream of the study site) were subject to pasture improvement schemes by heavy additions of fertiliser and lime, a process which has historically led to enhanced nutrient losses (Roberts et al, 1986). The catchment has a complex network of soil pipes which play an important role in the rapid routing of water to the network of streams.…”

Section: Soils and Vegetationmentioning

confidence: 99%

Groundwater nitrogen composition and transformation within a moorland catchment, mid-Wales

Lapworth

Shand

Abesser

et al. 2008

Science of The Total Environment

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The importance of upland groundwater systems in providing a medium for nitrogen transformations and processes along flow paths is investigated within the Afon Gwy moorland catchment, Plynlimon, mid-Wales. Dissolved organic nitrogen (DON) was found to be the most abundant form of dissolved nitrogen (N) in most soils and groundwaters, accounting for between 47 and 72% of total dissolved nitrogen in shallow groundwater samples and up to 80% in deeper groundwaters. A significant correlation between dissolved organic carbon (DOC) and DON in the shallow groundwater system suggests that during the autumn and winter months the flux of DON from the soil zone may be regulated by the wetting up and release of soil organic matter. DON needs to be taken into account when considering catchment N balances otherwise N export from upland catchments could be significantly underestimated. DON may also be an important source of bio-available N in surface waters and marine systems fed by upland catchments. A conceptual model of N processes is proposed based on a detailed study along a transect of nested boreholes and soil suction samplers within the interfluve zone. Shallow groundwater N speciation reflects the soil N speciation implying a rapid transport mechanism and good connectivity between the soil and groundwater systems. Median dissolved inorganic N concentrations were an order of magnitude lower within the soil zone (10-25 mg/L-N) than in the shallow groundwaters (100-750 mg/L-N).Given the rapid hydrostatic response of the groundwater level within the soil zone, the shallow groundwater system is both a source and sink for dissolved N. Results from dissolved N2O, N2/Ar ratios and dissolved N chemistry suggests that microbial N transformations (denitrification) may play an important role in controlling the spatial variation in soil and groundwater N speciation. Reducing conditions within the groundwater and saturated soils of the wet-flush zones on the lower hillslopes, a result of relatively impermeable drift deposits, are also important in controlling N speciation and transformation processes.

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Water Quality

Williams¹,

Neal²,

Jarvie³

et al. 2015

Progress in Modern Hydrology: Past, Present and Future

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Effect of upland pasture improvement on nutrient release in flow from a ‘natural’ lysimeter and a field drain

Cited by 17 publications

References 11 publications

Nitrogen and dissolved organic carbon (DOC) losses from an artificially drained grassland on organic soils

Nitrogen and dissolved organic carbon (DOC) losses from an artificially drained grassland on organic soils

Groundwater nitrogen composition and transformation within a moorland catchment, mid-Wales

Water Quality

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