Impacts of land-use/land-cover changes on nutrient losses in agricultural catchment, southern Ethiopia

Kuma, Hailu Gisha; Fufa, Fekadu; Demissie, Tamene Adugna

doi:10.2166/ws.2022.130

Cited by 8 publications

(3 citation statements)

References 53 publications

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“…Tong et al ( 2019 ) observed substantial soil organic carbon and TN losses when woodland and grassland were converted to cultivated land types. Similarly, Kooch and Noghre ( 2020 ) demonstrated due to variations in soil organic matter while in the tropics, Kuma et al ( 2022 ) showed high rates of nutrient loss in agricultural catchments. These findings collectively reveal that land cover plays a crucial role in nutrient cycling but, as shown in our study, delineation to individual subcatchment or stream scale may be required to identify causal relationships.…”

Section: Discussionmentioning

confidence: 91%

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Ayele,

Yu,

Bruere

et al. 2023

Environ Monit Assess

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The aim of this study was to quantify the effect of land use change (LUC) implemented to meet nutrient load targets for a freshwater lake in New Zealand. We used the Soil and Water Assessment Tool (SWAT) model in combination with a non-parametric statistical test to determine whether afforestation of 15% of a subcatchment area was adequate to meet assigned nutrient load targets. A regional management authority set nutrient load targets of reduction in total nitrogen (TN) by 0.9 t yr−1 and reduction in total phosphorus (TP) by 0.05 t yr−1 to avoid eutrophication in the receiving waters of a freshwater lake. The load reduction was designed to be achieved through 200 ha of LUC from pasture to trees. Analysis of nutrient loads before, during, and following LUC shows that a 15% increase in forest cover decreased the annual flow (7.2%), TP load (33.3%), and TN load (13.1%). As flow and water quality observations were discrete and at irregular intervals, we used a parametric test and the SWAT model as different lines of evidence to demonstrate the effect of afforestation on flow and water quality. Policymakers concerned with decisions about LUC to improve the quality of receiving waters can benefit from applying our findings and using a statistical and numerical modelling framework to evaluate the adequacy of land use change to support improvements in water quality.

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Section: Discussionmentioning

confidence: 91%

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Ayele,

Yu,

Bruere

et al. 2023

Environ Monit Assess

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“…Kajian terkait perubahan penggunaan lahan sudah banyak dilakukan oleh peneliti terdahulu baik kajian yang berupa perubahan penggunaan lahan seperti yang dilakukan oleh Chen et al, (2019); Kuma et al, (2022); Manikandan & Rangarajan, (2023); dan Siddik et al, (2022) ataupun kajian terkait kesesuaian penggunaan lahan permukiman seperti yang dilakukan oleh Li et al, (2022); Litasari et al, (2022); Nurzakiah et al, (2022); dan Utami et al, (2021). Pada kajian perubahan penggunaan lahan, penelitian-penelitian tersebut mengkaji perubahan penggunaan lahan berdasarkan beberapa temporal data dengan tujuan memperlihatkan gambaran perubahan penggunaan lahan secara keseluruhan dan dampak yang terjadi terhadap lingkungan yang ada di lokasi penelitian.…”

Section: Pendahuluanunclassified

Analisis Spasial Temporal Lahan Terbangun Terhadap Rawan Bencana Gempa Bumi di Kabupaten Cianjur

Mardalena

2023

gdk

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Abstrak Kabupaten Cianjur merupakan wilayah yang memiliki tingkat kerawanan gempa bumi yang tinggi. Gempa bumi yang melanda Kabupaten Cianjur pada 21 November 2022 memberikan dampak kerugian yang besar bagi masyarakatnya karena wilayah tersebut merupakan wilayah permukiman dengan kepadatan penduduk yang tinggi. Tujuan dari penelitian ini adalah mengetahui persebaran perubahan penggunaan lahan terbangun di Kabupaten Cianjur tahun 2013 dan 2022 serta menganalisis kesesuaian penggunaan lahan terbangun terhadap daerah rawan bencana gempa bumi. Metode yang digunakan dalam penelitian ini adalah analisis spasial temporal lahan terbangun pada tahun 2013 dan 2022 terhadap indeks rawan bencana gempa bumi yang dikeluarkan oleh BNPB. Hasil dari penelitian ini adalah perubahan penggunaan lahan terbangun di kawasan ini mengalami peningkatan dari 5.290 Ha menjadi 7.009,63 Ha. Persebaran Penggunaan Lahan terbangun dari tahun 2013 dan 2022 didominasi pada kategori indeks kerawanan sedang dan tinggi serta mengalami peningkatan persentase pada tingkat kerawanan tinggi dari 37,31% menjadi 45,06% luas lahan terbangun.

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“…Beside was resulting water path contamination, it is highly related as one of main cause of food insecurity for many developing countries because of gap in agricultural production (Anas et al, 2020;Dinnes et al, 2002;Kimbi et al, 2022;Okamoto et al, 2021) due to poor trend in cropland nitrogen fertilizer management. Changes in the climate in the Bilate watershed have been recognized in previous research as a climatic impact for nitrogen fertilizer loss on agricultural land however taking the whole watershed was agricultural land; it has still highlighted a knowledge gap in its research without crop types and cropping season (Kuma et al, 2022). Since agricultural land nitrogen loss is not continuous, it is important to consider specific cropping season, crop classification and biomass index (Cao et al, 2014;Dinnes et al, 2002;Elrashidi et al, 2005; Z. H. Wang & Li, 2019) crop land nitrogen loss parameters, such as main cropping season and pattern of crop growth has to be calibrated for (NO -3-N) runoff\leaching analysis.…”

Section: Introductionmentioning

confidence: 99%

Modeling canopy water content in the assessment for rainfall induced surface and groundwater nitrate contamination index from cropland N-fertilizer in Bilate downstream

Assa

Bhowmick

Elias

2023

Preprint

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Crop canopy water content and crop root zone soil water content have been predicted and observed for estimation of crop water balance for the rainy season nitrate runoff and leaching index of the Bilate watershed cropland. For the calibration of earth data observation, the watershed rain gauge station estimated the pattern of rainfall for the main cropping season of crop growth. Cropping season (Apr, May and Jun) monthly mean rainfall between (125mm/month to 165 mm/month) of agro metrological station has predicted time series crop canopy water in the analysis for crop land nitrate-nitrogen leaching/runoff index for the quantification of groundwater and surface runoff nitrate from the Bilate watershed farming zone. May and June were the months in which crops grew in the cropland of the study area, as indicated by the crop biomass statistics from MODIS 006 MOD13Q1-EVI of (Mine 0.19 and Max, 0.57) which is the average crop coefficient Kc for crop growth curve analyzed for model crop parameter. Hyper-spectral indices derived from enhanced vegetation indices (EVI) have been calculated for the analysis of crop zonal biomass statistics (kc) and integrated into the prediction model. The objective of the current research was to predict crop canopy water content in order to determine crop water balance for farmland Nitrogen Nitrate (NO− 3-N) runoff\leaching index for surface and groundwater pollution in the Bilate downstream. The overall predicted result of crop canopy water content has been validated with a regression coefficient (R2) with observed crop root zone soil water content. And the crop land nitrogen balance has been used to confirm the nitrate-nitrogen leaching and runoff index for the study area by comparing the current result with the crop land nitrogen balance.

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Impacts of land-use/land-cover changes on nutrient losses in agricultural catchment, southern Ethiopia

Cited by 8 publications

References 53 publications

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Analisis Spasial Temporal Lahan Terbangun Terhadap Rawan Bencana Gempa Bumi di Kabupaten Cianjur

Modeling canopy water content in the assessment for rainfall induced surface and groundwater nitrate contamination index from cropland N-fertilizer in Bilate downstream

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