Scale issues for assessment of nutrient leaching from agricultural land in Latvia

Lagzdiņš, Ainis; Jansons, Viesturs; Sudars, Ritvars; Abramenko, Kaspars

doi:10.2166/nh.2012.122

Cited by 18 publications

(18 citation statements)

References 12 publications

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“…Hansen et al, 2001;Rode et al, 2009Rode et al, , 2010. It was reported that the nutrient concentrations in the streams were highly correlated with the percentage of agricultural land (Lagzdins et al, 2012). Through influencing runoff generation and nutrient turnover processes, climate variability (precipitation and temperature) affects nitrate leaching (Andersen et al, 2006;Bouraoui et al, 2004;De Klein and Koelmans, 2011;Li et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Modelling inorganic nitrogen leaching in nested mesoscale catchments in central Germany

2014

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Water quality models are increasingly used to predict nutrient losses from anthropogenically impacted catchments, but comprehensive model calibration and transfer of model parameters are often difficult. The objectives of this study are (i) to assess the Hydrological Predictions for the Environment (HYPE) model for simulating runoff and inorganic nitrogen (IN) leaching in nested and spatially heterogeneous mesoscale catchments in central Germany and (ii) to investigate the temporal and spatial variations of IN leaching. A multi‐site and multi‐objective calibration approach using the parameter estimation tool PEST was employed. Results showed that parameters related to evapotranspiration were most sensitive for runoff simulation. The nitrogen balance was controlled by plant uptake and denitrification. Runoff was well reproduced for both calibration (1994–1999) and validation (1999–2004) periods at all three gauging stations, with the lowest Nash–Sutcliffe efficiency (NSE) of 0·86 and bias (PBIAS) of less than 15%. In addition, the model was tested successfully to predict the dynamics of soil water storage during extreme climatological events. IN concentrations showed increase in magnitude and decrease in dynamics from upstream to downstream of the catchment, reflecting the combined effects of nutrient inputs and IN in‐stream retention. The dynamics of monthly IN loads were well represented by the model during the whole simulation period, with the lowest NSE and PBIAS of 0·69 and 33%, respectively. Results revealed seasonal dynamics of IN leaching due to the combined effects of hydrological and biogeochemical processes, which is consistent with runoff dynamics. This indicates the controlling role of hydrology on nitrogen transport processes. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Modelling inorganic nitrogen leaching in nested mesoscale catchments in central Germany

2014

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“…Other authors [9,[50][51][52] determined that with the increase in catchment area, the soluble nitrogen concentrations in the stream water runoff decreased. They explained the phenomenon by the higher impact of ground water discharge in the large catchments.…”

Section: Discussionmentioning

confidence: 99%

“…As stated by HELCOM [5,6], agriculture contributes approximately 80% of the total nitrogen load entering the Baltic Sea. Long-term observations in the Baltic countries (Estonia, Latvia and Lithuania) indicate that average annual losses of total nitrogen and total phosphorus from agricultural catchments can vary from 5 to 40 kg N ha −1 [7][8][9][10] and from 0.120 to 0.421 kg P ha −1 [11], respectively. These amounts were highly affected by various factors.…”

Section: Introductionmentioning

confidence: 99%

Changes in Nutrient Concentrations of Two Streams in Western Lithuania with Focus on Shrinkage of Agriculture and Effect of Climate, Drainage Runoff and Soil Factors

Bučienė

Povilaitis

Langas

et al. 2019

Water

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The causal relationship of changes in nitrogen and phosphorus concentrations in the Akmena-Danė River and its largest tributary, the Eketė River, was analysed for the period 1999–2014. Results showed that the annual concentrations of NH4-N and PO4-P significantly decreased in the Eketė River over the research period. NH4-N also significantly decreased in the Akmena-Danė River. This was mostly due to the shrinkage of agriculture, i.e., the reduction in agricultural land area, total farm and animal numbers and other agricultural activities. The effect of other factors such as air temperature, precipitation rate, shift of precipitation maximum from warm to cold season, drainage runoff from the large tile-drained areas, soil types and the slight increase in forested land was also examined.

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“…Fölster et al 2012;Hauken et al 2012), or in some cases in scientific journals for single countries (e.g. Gaigalis & Račkauskaitė 2001;Vuorenmaa et al 2002;Sileika et al 2005;Kyllmar et al 2006;Bechmann et al 2008;Lagzdins et al 2012) or single streams (e.g. Mander et al 2000;Bechmann & Stålnacke 2005), but mostly with different chemical parameters, time periods assessed or various statistical methods.…”

Section: Introductionmentioning

confidence: 99%

Temporal trends in phosphorus concentrations and losses from agricultural catchments in the Nordic and Baltic countries

Pengerud

Stålnacke

Bechmann

et al. 2015

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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This paper in a uniform manner examines temporal trends in phosphorus (P) concentrations and losses from small and well-monitored agricultural catchments in the Nordic and Baltic countries. Thirty-four catchments (range 0.1-33 km 2 ) in Norway (8), Denmark (5), Sweden (8), Finland (4), Estonia (3), Latvia (3) and Lithuania (3) were selected for the study. The time series ranged from 10 (2002-2011) to 21 years . The monthly P concentration and loss time series were tested for significant monotone trends (p < 0.05; two-sided test) using the partial Mann-Kendall test with stream discharge as an explanatory variable. The results show a large variation in concentrations and losses of total phosphorus (TP) among the 34 studied catchments, where the long-term mean annual losses varied from 0.09 to 7.5 kg TP ha −1 . In addition, a large interannual variability in losses within catchments was found with up to a factor of 23 between years within the same catchment. Six catchments showed downward temporal trends in the TP loss time series. One upward trend in TP losses was detected in a catchment in south-west Sweden. Eight downward trends were detected in the TP concentration time series. Overall, our results show (1) a huge variability in mean P losses and concentrations among catchments, (2) a huge temporal variability in losses within catchments and (3) few detectable changes in P losses and concentrations over the study period. The results showcase the need for implementation of mitigation strategies towards reduced P losses from agricultural landscapes in the Nordic/Baltic Sea region in order to improve P water quality and ecology in surface waters.

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Scale issues for assessment of nutrient leaching from agricultural land in Latvia

Cited by 18 publications

References 12 publications

Modelling inorganic nitrogen leaching in nested mesoscale catchments in central Germany

Modelling inorganic nitrogen leaching in nested mesoscale catchments in central Germany

Changes in Nutrient Concentrations of Two Streams in Western Lithuania with Focus on Shrinkage of Agriculture and Effect of Climate, Drainage Runoff and Soil Factors

Temporal trends in phosphorus concentrations and losses from agricultural catchments in the Nordic and Baltic countries

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