Dissolved organic carbon concentration and denitrification capacity of a hill country sub-catchment as affected by soil type and slope

Chibuike, Grace; Burkitt, LL; Bretherton, Mike; Arbestain, Marta Camps; Singh, Ranvir; Bishop, Peter; Hedley, C. B.; Roudier, Pierre

doi:10.1080/00288233.2018.1508041

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…However, longer‐term monitoring is required to better understand this interaction especially under different climatic seasons. It is worth noting that Chibuike, Burkitt, Bretherton, et al (2019) observed higher denitrification capacity below the surface 0.3 m soil depth of Ramiha (a well‐drained soil) compared with other soil types on Tuapaka hill country farm. They attributed the high denitrification capacity to the soil's greater DOC concentration (>100 mg kg −1 below 0.3 m depth) resulting from its high content of short‐range order constituents (allophane).…”

Section: Effects Of Landscape Features and Land Management Practices ...mentioning

confidence: 95%

“…To date, there are limited studies on the potential effects of slope and soil type on the transport and transformation of nitrate at depth in the soil profile on pastoral hill country landscapes. In a study assessing potential denitrification activity at the Tuapaka hill country farm near Palmerston North in NZ, Chibuike, Burkitt, Bretherton, et al (2019) found more than 50% lower denitrification capacity below the 0.3 m soil depth compared with the surface 0.3 m soil depth, but soil type rather than slope had a greater effect on denitrification capacity (see Subsection 2.3 for additional information on this soil type). In general, slope affects seepage water flows, with longer groundwater residence time and hence potentially higher denitrification potential on toe slopes (Messer et al, 2012; Ocampo et al, 2006).…”

Section: Effects Of Landscape Features and Land Management Practices ...mentioning

confidence: 99%

“…The efficiency of subsurface denitrification is influenced by soil moisture content and drainage characteristics, underlying hydrogeology, and supply/availability of dissolved organic carbon (DOC) (Barkle et al, 2007; Chibuike et al, 2021; Clague et al, 2013; Jha et al, 2018; Peterson et al, 2013; Rivas et al, 2020; Starr & Gillham, 1993). Several studies have been conducted to measure nitrate losses and its potential attenuation via denitrification in pastoral hill country landscapes (Burkitt et al, 2016; Burns & Nguyen, 2002; Chibuike, Burkitt, Bretherton, et al, 2019; Chibuike et al, 2020; Matheson et al, 2002; Rutherford & Nguyen, 2004; Sanwar, 2023). The unique features of pastoral hill country landscape (e.g., topography and soil characteristics) have the potential to influence the efficiency of subsurface denitrification by affecting the availability of substrates, particularly DOC, required for denitrification below the soil surface (Chibuike, Burkitt, Bretherton, et al, 2019; Sanwar, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been conducted to measure nitrate losses and its potential attenuation via denitrification in pastoral hill country landscapes (Burkitt et al, 2016; Burns & Nguyen, 2002; Chibuike, Burkitt, Bretherton, et al, 2019; Chibuike et al, 2020; Matheson et al, 2002; Rutherford & Nguyen, 2004; Sanwar, 2023). The unique features of pastoral hill country landscape (e.g., topography and soil characteristics) have the potential to influence the efficiency of subsurface denitrification by affecting the availability of substrates, particularly DOC, required for denitrification below the soil surface (Chibuike, Burkitt, Bretherton, et al, 2019; Sanwar, 2023). A sound understanding of how pastoral hill country landscape features influence nitrate losses to receiving waters is imperative in tackling the issue of water quality degradation.…”

Section: Introductionmentioning

confidence: 99%

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The effects of pastoral hill country natural landscape features and land management practices on nitrate losses and its potential attenuation for improved water quality

Chibuike,

Singh,

Burkitt

2024

J of Sust Agri & Env

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Pastoral farming on hill country landscapes influences nitrogen (N) dynamics and its losses to freshwater. This study reviewed the current literature identifying key effects of pastoral hill country landscape features and land management practices on nitrate losses to receiving waters. The review also highlighted the potential effects of inherent landscape features on nitrate attenuation pathways for better water quality outcomes. Intensive land use activities involving high rates of fertiliser application, higher stocking rates and cattle grazing, relative to sheep grazing, are more likely to increase nitrate loss, especially on lower slopes. However, soils with a high carbon (C) storage capacity such as allophanic soils potentially limit nitrate loss via denitrification in subsoil layers. Hill country seepage wetlands also offer an opportunity to attenuate nitrate loss, though their efficacy is largely impacted by hydrological variations in their inflows and outflows. By enhancing the natural nitrate attenuation capacity of seepage wetlands, mapping and strategic use of high subsoil denitrification potential, effective riparian management, efficient fertiliser and grazing practices and the incorporation of these farm management strategies into Freshwater Farm Plans (FWFPs), wider environmental and farm productivity/profitability goals, including improved water quality, would be achieved on pastoral hill country landscapes.

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Section: Effects Of Landscape Features and Land Management Practices ...mentioning

confidence: 95%

Section: Effects Of Landscape Features and Land Management Practices ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effects of pastoral hill country natural landscape features and land management practices on nitrate losses and its potential attenuation for improved water quality

Chibuike,

Singh,

Burkitt

2024

J of Sust Agri & Env

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“…When the appropriate amount Agriculture 2021, 11, 561 2 of 15 of crop straw is incorporated into the soil, the nutrient content in the soil will increase to promote the growth of soil microorganisms [12]. However, microbial processes for crop straw decomposition are affected by the straw quality and other abiotic factors influencing soil microbial activity and community composition, such as soil type and temperature, nitrogen (N) and phosphorus (P) levels, pH, and the C/N ratio [13][14][15][16][17]. Therefore, microbial activities and communities will have different characteristics in different areas when the straw is returned to the field.…”

Section: Introductionmentioning

confidence: 99%

Effects of Short-Term Rice Straw Return on the Soil Microbial Community

et al. 2021

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Rice straw is a byproduct of agricultural production and an important agricultural resource. However, rice straw has not yet been effectively used, and incorrect treatment methods (such as burning in the field) can cause serious damage to the environment. Studies have shown that straw returning is beneficial to soil, but there have been few studies focused on the effect of the amount of short-term straw returned on the soil microbial community. This study evaluates 0%, 50%, 75%, and 100% rice straw returned to the field on whether returning different amounts of straw in the short term would affect the diversity and composition of the soil microbial community and the correlation between bacteria and fungi. The results show that the amount of straw returned to the field is the main factor that triggers the changes in the abundance and composition of the microbial community in the paddy soil. A small amount of added straw (≤ 50% straw added) mainly affects the composition of the bacterial community, while a larger amount of added straw (> 50% straw added) mainly affects the composition of the fungal community. Returning a large amount of straw increases the microbial abundance related to carbon and iron cycles in the paddy soil, thus promoting the carbon and iron cycle processes to a certain extent. In addition, network analysis shows that returning a large amount of straw also increases the complexity of the microbial network, which may encourage more microbes to be niche-sharing and comprehensively improve the ecological environment of paddy soil. This study may provide some useful guidance for rice straw returning in northeast China.

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A Review of On-farm Roadway Runoff Characterisation and Potential Management Options for Ireland

Fenton

Tuohy

Daly

et al. 2021

Water Air Soil Pollut

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Runoff from farm roadways within farm boundaries are acknowledged as a year round source of pollutants discharging to surface water, particularly during the main grazing season (Feb-Nov) when their usage is high. These losses are considered to be a significant catchment scale pressure and have led to recent legislation in Ireland to prohibit direct runoff from farm roadways to waters with similar guidance in the UK and New Zealand. However roadway runoff (RR) remains an undocumented and understudied part of the transfer continuum where knowledge gaps remain in relation to its quantity and composition, and in relation to the impacts of RR management options on adjacent surface waters. Indeed some information on mitigation measure design and efficacy is only available from non-agriculture land uses e.g. forestry and needs to be presented in a farm specific context. The present review brings together knowledge on RR in terms of content on-or off-roadway management options and proposes alternative mitigation measures that may require pilot scale testing. Studies show that RR contains a mix of legacy (surface materials) and incidental (fresh urine and faeces) constituents such as phosphorus (P), Escherichia coli (E. Coli) and sediment which become temporarily mobilised during rainfall events. Once mobilised, the roadway network can quickly transport pollutants providing connectivity between farmyards, hard standings, underpasses where attached to a watercourse, fields and even public roadways to watercourses. Its contents are not dissimilar to dilute slurry or dairy soiled water with loads being highest where animals congregate (within 100 m of the farmyard or where roadway configuration or quality impedes stock movement along the network). On-roadway management options include regularly spaced diversion structures that divert runoff for passive treatment in a field or drainage ditch or the application of chemical amendments to roadway surfaces. Off-roadway options can include natural or enhanced features, which attenuate flow leading to settlement of suspended sediment and in some cases treatment of a percentage of the load before delivery to a watercourse. It should be noted that the options presented in this review need to be retrofitted to site specific conditions. Therefore, a number of factors, including their effectiveness, cost and management needs on a particular farm, as well as local regulation requirements will need to be considered prior to implementation. Therefore, only the measures that divert RR away from waters are applicable to Ireland. Future research should develop and validate a farm roadway risk assessment tool to identify vulnerable roadway sections that need management and/or re-design, and identify means of incorporating RR into catchment scale risk assessment models. In addition, design of on-and off-RR management options should consider the wide variations in farm configuration and management with regard to size, topography, soil type/drainage class, enterprise, intensity, scale, stage of d...

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Dissolved organic carbon concentration and denitrification capacity of a hill country sub-catchment as affected by soil type and slope

Cited by 9 publications

References 14 publications

The effects of pastoral hill country natural landscape features and land management practices on nitrate losses and its potential attenuation for improved water quality

The effects of pastoral hill country natural landscape features and land management practices on nitrate losses and its potential attenuation for improved water quality

Effects of Short-Term Rice Straw Return on the Soil Microbial Community

A Review of On-farm Roadway Runoff Characterisation and Potential Management Options for Ireland

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