Modelling of excess nitrogen in small rural catchments

Kull, Anne; Kull, Ain; Uuemaa, Evelyn; Kuusemets, Valdo; Mander, Ülo

doi:10.1016/j.agee.2004.12.011

Cited by 13 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GIS tools are useful for modeling complex relationships between land use, erosion, and and when they are combined with a soil loss model such as RUSLE, they can contribute greatly to sustainable land-use planning (Kull et al 2005). However, several factors create uncertainty in our modeling results, including the absence of reliable data to parameterize the models and uncertainties in the climate model outputs that drive the soil loss model (Alewell et al 2019).…”

Section: Limitations Of Our Soil Erosion Modelmentioning

confidence: 99%

Future soil loss in highland Ethiopia under changing climate and land use

et al. 2020

Self Cite

View full text Add to dashboard Cite

Soil erosion caused by climate and land-use changes is one of the biggest environmental challenges in highland Ethiopia. The aim of this study was to assess the future soil erosion risks and evaluate the potential conservation measures in the Rib watershed, northwestern highland Ethiopia. We used the HadGEM2-ES model with a moderate greenhouse gas (GHG) concentration scenario (RCP4.5) to project the future climate. The future land-use patterns were predicted using the CA-Markov model. We integrated the RUSLE model with GIS to estimate the spatial distribution of soil loss and identify erosion risk areas. We found that the Rib watershed is highly vulnerable to future climate and land-use changes, leading to a high soil erosion risk. Despite slight growth of forest cover during the study period, the total soil loss for the watershed was estimated to be 7.93 × 10 6 t year −1 in 2017 and was predicted to increase to 9.75 × 10 6 t year −1 in 2050, an increase of about 23%. The increase in forest cover was due to the expansion of the area of eucalyptus plantations which are more prone to erosion. Moreover, field survey showed that the residual native forests are sparsely vegetated and mostly used for cattle grazing, increasing the erosion risk even more. In contrast, the combined use of afforestation with native trees and physical soil conservation measures in the upper areas of the catchment could decrease soil loss by 62%. Our results stress the importance of combining soil conservation measures, including converting eucalyptus plantations to native forests, to mitigate the effects of future climate change and increased agricultural production on soil erosion.

show abstract

Section: Limitations Of Our Soil Erosion Modelmentioning

confidence: 99%

Future soil loss in highland Ethiopia under changing climate and land use

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Between 1997 and 2001 land use stabilised at low intensity (Kull et al, 2005) while the nutrient discharges decreased substantially (Mander et al, 1998). Only the wooded Upper Course subcatchment showed no significant change in annual nutrient runoff (Kull et al, 2005). Between 2001 and 2006 the extensification of the previous decade was reversed (Fig.…”

Section: Tablementioning

confidence: 96%

“…In the latter about 90% of the arable land became seminatural and cultivated grassland (a rise from 0.5 to 49.5% and from 0.9 to 24.6% respectively; Mander et al, 2000). Between 1997 and 2001 land use stabilised at low intensity (Kull et al, 2005) while the nutrient discharges decreased substantially (Mander et al, 1998). Only the wooded Upper Course subcatchment showed no significant change in annual nutrient runoff (Kull et al, 2005).…”

Section: Tablementioning

confidence: 99%

Nitrogen and phosphorus discharge from small agricultural catchments predicted from land use and hydroclimate

et al. 2018

Self Cite

View full text Add to dashboard Cite

“…Although many investigations have been undertaken to integrate catchment and water management policy goals with surface and sub-surface losses of N and other agrochemicals (pesticides and insecticides) from watersheds under unique LU/LC conditions [24][25][26], studies of these losses from mixed type watersheds in order to formulate management plans are limited. Therefore, the objective of this study was to simulate runoff, sediment transport, nitrate nitrogen (NO 3 -N), ammonium nitrogen (NH 4 -N), and water soluble phosphorous (P) using the SWAT model and then apply the calibrated model to estimate the losses of NO 3 -N, NH 4 -N, water soluble P, organic N and organic P as NPS pollutants to the downstream water resources.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Non-Point Source N and P Loads in a Small Mixed Land Use Land Cover Watershed

Mishra¹,

Singh²,

Singh³

2010

JWARP

View full text Add to dashboard Cite

Non-point source pollution (NPS) of water resources has become a major problem in recent years due to more human interactions and disturbances to natural landscapes. The problem can have more impacts in sub-humid subtropical regions where high intensity monsoon rains have greater effects on hydrologic proc-esses and thus the assessment of those effects is necessitated for strategic water resources and environmental management. Since spatial and temporal changes of NPS pollutants are difficult to assess on a watershed scale, the assessment can be done effectively using a suitable water quantity-quality model coupled with GIS and remote sensing that incorporates spatial variations. The objective of this study was to assess the N and P loads from a small mixed type watershed comprising different land use land covers with the aid of Soil and Water Assessment Tool (SWAT)-a hydrologic-water quality model. The model was calibrated for runoff and sediment transport and then simulation of associated N and P loads as NPS pollution was done and compared with measured values at the outlet of the watershed which is part of the DVC Command, Hazaribagh, India. The calibrated SWAT model was used to estimate the water soluble NO3-N, NH4-N, P, organic N and or-ganic P loads being transported as pollutants by runoff and percolated water. The estimates of these pollut-ants provided information on the extent of NPS pollution of water downstream. The results of the study re-veal that the NPS pollutant load in runoff varies with seasonal rainfall patterns and ranges from 2.57 to 4.52 kg/ha in case of NO3-N which accounts for a maximum load of 7661.40 kg of NO3-N in surface runoff from the watershed under study. The total loss of N from the watershed accounts for as high as 8.84 kg/ha, whereas the P load is 0.02 kg/ha. These losses can be as high as 14984.14 kg of total N and 50.85 kg of total P when estimated as NPS pollutants from the watershed. The study is therefore important to get an estimate of the extent of these pollutants and develop measures for mitigating the losses as nutrient as well as pollu-tion of water resources

show abstract

Modelling of excess nitrogen in small rural catchments

Cited by 13 publications

References 25 publications

Future soil loss in highland Ethiopia under changing climate and land use

Future soil loss in highland Ethiopia under changing climate and land use

Nitrogen and phosphorus discharge from small agricultural catchments predicted from land use and hydroclimate

Evaluation of Non-Point Source N and P Loads in a Small Mixed Land Use Land Cover Watershed

Contact Info

Product

Resources

About