Estimating soil erosion risk and evaluating erosion control measures for soil conservation planning at Koga watershed in the highlands of Ethiopia

Solid Earth - Tập 8 Số 1 - Trang 13-25
Tegegne Molla1,2, Biniam Sisheber1,2
1Department of Geography and Environmental Studies, Bahir Dar University, Bahir Dar, Ethiopia
2Geospatial Data and Technology research Center (GDTC), Bahir Dar University, Bahir Dar, Ethiopia

Tóm tắt

Abstract. Soil erosion is one of the major factors affecting sustainability of agricultural production in Ethiopia. The objective of this paper is to estimate soil erosion using the universal soil loss equation (RUSLE) model and to evaluate soil conservation practices in a data-scarce watershed region. For this purpose, soil data, rainfall, erosion control practices, satellite images and topographic maps were collected to determine the RUSLE factors. In addition, measurements of randomly selected soil and water conservation structures were done at three sub-watersheds (Asanat, Debreyakob and Rim). This study was conducted in Koga watershed at upper part of the Blue Nile basin which is affected by high soil erosion rates. The area is characterized by undulating topography caused by intensive agricultural practices with poor soil conservation practices. The soil loss rates were determined and conservation strategies have been evaluated under different slope classes and land uses. The results showed that the watershed is affected by high soil erosion rates (on average 42 t ha−1 yr−1), greater than the maximum tolerable soil loss (18 t ha−1 yr−1). The highest soil loss (456 t ha−1 yr−1) estimated from the upper watershed occurred on cultivated lands of steep slopes. As a result, soil erosion is mainly aggravated by land-use conflicts and topographic factors and the rugged topographic land forms of the area. The study also demonstrated that the contribution of existing soil conservation structures to erosion control is very small due to incorrect design and poor management. About 35 % out of the existing structures can reduce soil loss significantly since they were constructed correctly. Most of the existing structures were demolished due to the sediment overload, vulnerability to livestock damage and intense rainfall. Therefore, appropriate and standardized soil and water conservation measures for different erosion-prone land uses and land forms need to be implemented in Koga watershed.

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Tài liệu tham khảo

ACRES: Koga irrigation and watershed management project feasibility study report. Koga catchment and irrigation studies. ACRES International Limited, Canada in association with Shawel Consult International, Ethiopia, 2006.

Adimassu, Z., Mekonnen, K., Yirga, C., and Kessler, A.: Effect of soil bunds on runoff, soil and nutrient losses, and crop yield in the central highlands of Ethiopia, Land Degrad. Dev., 25, 554–564, https://doi.org/10.1002/ldr.2182, 2014.

Andersson, L.: Soil loss estimation based on the USLE/GIS approach through small catchments: A minor field study in Tunisia, Technical report TVVR 10/5019, Division of Water Resources Engineering, Department of Building and Environmental Technology, Lund University, Lund, Sweden, 5–14, 2010.

Angassa, A.: Effects of grazing intensity and bush encroachment on herbaceous species and rangeland condition in southern Ethiopia, Land Degrad. Dev., 25, 438–451, https://doi.org/10.1002/ldr.2160, 2014.

Angima, S. D., Stott, D. E., O'Neill, M. K., Ong, C. K., and Weesies, G. A.: Soil erosion prediction using RUSLE for central Kenyan highland conditions, Agr. Ecosyst. Environ., 97, 295–308, 2003.

Badege, B.: Deforestation and land degradation in the Ethiopian Highlands: A strategy for physical recovery, Northeast Afr. Stud., 8, 7–26, 2001.

Belyaev, V. R., Wallbrink, P. J., Golosov, V. N., Murray, A. S., and Sidorchuk, A.: A comparison of methods for evaluating soil redistribution in the severely eroded Stavropol region, southern European Russia, Faculty of Geography, Moscow State University, Moscow, Russia, 2004.

Berendse, F., van Ruijven, J., Jongejans, E., and Keesstra, S.: Loss of plant species diversity reduces soil erosion resistance, Ecosystems, 18, 881–888, https://doi.org/10.1007/s10021-015-9869-6, 2015.

Betrie, G. D., Mohamed, Y. A., van Griensven, A., and Srinivasan, R.: Sediment management modelling in the Blue Nile Basin using SWAT model, Hydrol. Earth Syst. Sci., 15, 807–818, https://doi.org/10.5194/hess-15-807-2011, 2011.

Bewket, W.: Soil and water conservation intervention with conventional technologies in northwestern highlands of Ethiopia: Acceptance and adoption by farmers, Land Use Policy, 24, 404–416, 2007.

Bewket, W. and Teferi, E.: Assessment of soil erosion hazard and prioritization for treatment at the watershed level: case study in the Chemoga watershed, Blue Nile basin, Ethiopia, Land Degrad. Dev., 20, 609–622, https://doi.org/10.1002/ldr.944, 2009.

Biswas, H., Raizada, A., Mandal, D., Kumar, S., Srinivas, S., and Mishra, P. K.: Identification of areas vulnerable to soil erosion risk in India using GIS methods, Solid Earth, 6, 1247–1257, https://doi.org/10.5194/se-6-1247-2015, 2015.

Bravo-Espinosa, M., Mendoza, M. E., Carló, T., Allende, N., Medina, L., Sáenz-Reyes, J. T., and Páez, R.: Effects of converting forest to avocado orchards on topsoil properties in the transmexican volcanic system, Mexico, Land Degrad. Dev., 25, 452–467, https://doi.org/10.1002/ldr.2163, 2014.

Brevik, E. C., Cerdà, A., Mataix-Solera, J., Pereg, L., Quinton, J. N., Six, J., and Van Oost, K.: The interdisciplinary nature of SOIL, SOIL, 1, 117–129, https://doi.org/10.5194/soil-1-117-2015, 2015.

Cerdà, A., González-Pelayo, O., Giménez-Morera, A., Jordán, A., Pereira, P., Novara, A., Brevik, E. C., Prosdocimi, M., Mahmoodabadi, M., Keesstra, S., García Orenes, F., and Ritsema, C.: The use of barley straw residues to avoid high erosion and runoff rates on persimmon plantations in Eastern Spain under low frequency-high magnitude simulated rainfall events, Soil Research, 54, 154–165, https://doi.org/10.1071/SR15092, 2016.

Colazo, J. C. and Buschiazzo, D.: The impact of agriculture on soil texture due to wind erosion, Land Degrad. Dev., 26, 62–70, https://doi.org/10.1002/ldr.2297, 2015.

CSA (Central Statistical Agency): Population Projection for Ethiopia 2007–2037, Addis Ababa, Ethiopia, 2015.

Dai, Q., Liu, Z., Shao, H., and Yang, Z.: Karst bare slope soil erosion and soil quality: a simulation case study, Solid Earth, 6, 985–995, https://doi.org/10.5194/se-6-985-2015, 2015.

Decock, C., Lee, J., Necpalova, M., Pereira, E. I. P., Tendall, D. M., and Six, J.: Mitigating N2O emissions from soil: from patching leaks to transformative action, SOIL, 1, 687–694, https://doi.org/10.5194/soil-1-687-2015, 2015.

Erdogan, E. H., Erpul, G., and Bayramin, I.: Use of USLE/GIS methodology for predicting soil loss in a semiarid agricultural watershed, Environ. Monit. Assess., 131, 153–161, 2007.

Erkossa, T., Wudneh, A., Desalegn, B., and Taye, G.: Linking soil erosion to on-site financial cost: lessons from watersheds in the Blue Nile basin, Solid Earth, 6, 765–774, https://doi.org/10.5194/se-6-765-2015, 2015.

FAO: Natural resources and the human environment for food and agriculture in Africa, FAO Environment and Energy Paper No. 6, Rome, Italy, 88 p., 1986.

Gebreyesus, B. and Kirubel, M.: Estimating soil loss using Universal Soil Loss Equation (USLE) for soil conservation planning at Medego watershed, Northern Ethiopia, J. Am. Sci., 5, 58–69, 2009.

Gessesse, B., Bewket, W., and Bräuning, A.: Model-based characterization and monitoring of runoff and soil erosion in response to land use/land cover changes in the Modjo watershed, Ethiopia, Land Degrad. Dev., 26, 711–724, https://doi.org/10.1002/ldr.2276, 2015.

Herweg, K. and Ludi, E.: The performance of selected soil and water conservation measures: case studies from Ethiopia and Eritrea, Catena, 36, 99–114, 1999.

Hurni, H.: Erosion-productivity-conservation systems in Ethiopia, in: Sentis IP (ed) soil conservation and productivity, Proceedings 4th international conference on soil conservation, 3–9 November 1985, Maracay, Venezuela, 654–674, 1985.

Hurni, H.: Degradation and conservation of soil resources in the Ethiopian highlands, Mt. Res. Dev., 8, 123–130, 1990.

Hurni, H.: Land degradation, famine, and land resource scenarios in Ethiopia, World Soil Erosion and Conservation, Cambridge University Press, Cambridge, UK, 27–62, 1993.

Hurni, H., Kebede, T., and Zeleke, G.: Implications of changes in population, land use and land management for surface runoff in the upper basin area of Ethiopia, Mt. Res. Dev., 25, 147–154, 2005.

Kaltenrieder, J.: Adaptation and validation of the universal soil loss equation (USLE) for the Ethiopian-Eritrean Highlands, MSc Thesis, University of Berne, Centre for Development and Environment, Geographisches Institut, Bern, Switzerland, 2007.

Katsuyuki, M.: Soil and humanity: Culture, civilization, livelihood and health, Soil Sci. Plant Nutr., 55, 603–615, https://doi.org/10.1111/j.1747-0765.2009.00401.x, 2009.

Keesstra, S., Pereira, P., Novara, A., Brevik, E. C., Azorin-Molina, C., Parras-Alcántara, L., Jordán, A., and Cerdà, A.: Effects of soil management techniques on soil water erosion in apricot orchards, Sci. Total Environ., 551, 357–366, https://doi.org/10.1016/j.scitotenv.2016.01.182, 2016.

Ligonja, P. J. and Shrestha, R. P.: Soil erosion assessment in kondoa eroded area in Tanzania using universal soil loss equation, geographic information systems and socioeconomic approach, Land Degrad. Dev., 26, 367–379, https://doi.org/10.1002/ldr.2215, 2015.

Ludi, E.: Economic analysis of soil conservation: case studies from the highlands of Amhara region, Ethiopia, Geographica Bernensia, African Studies A18, Institute of Geography, Bern, Switzerland, 2004.

Lulseged, T. and Vlek, P. L. G.: Soil erosion studies in Northern Ethiopia, Center for Development Research, University of Bonn, Bonn, Germany, 2008.

MoARD (Ministry of Agriculture and Rural development): Community based participatory watershed development: A Guideline, MoARD, Addis Ababa, Ethiopia, 2005.

MoARD (Ministry of Agriculture and Rural Development): Ethiopia's Agricultural Sector Policy and Investment Framework (PIF) 2010–2020, Draft Final Report, Addis Ababa, Ethiopia, 1–15, 2010.

Moges, A. and Holden, N. M.: Farmers' perceptions of soil erosion and soil fertility loss in southern Ethiopia, Land Degrad. Dev., 18, 543–554, 2006.

Morgan, R. P. C.: Soil erosion and conservation, second ed., Longman Silsoe College, Cranfield University, Cranfield, UK, 1996.

Mwendera, E. J., Mohamed, S., and Dibabe A.: The effect of livestock grazing on surface runoff and soil erosion from sloping pasture lands in the Ethiopian highlands, Aust. J. Exp. Res., 37, 421–430, 1997.

Ochoa-Cueva, P., Fries, A., Montesinos, P., Rodríguez-Díaz, J. A., and Boll, J.: Spatial estimation of soil erosion risk by land-cover change in the Andes of Southern Ecuador, Land Degrad. Dev., 26, 565–573, https://doi.org/10.1002/ldr.2219, 2015.

Pacheco, F. A. L., Varandas, S. G. P., Sanches Fernandes, L. F., and Valle Jr., R. F.: Soil losses in rural watersheds with environmental land use conflicts, Sci. Total Environ., 485–486, 110–120, 2014.

Paulos, D.: Soil and water resources and degradation factors affecting their productivity in the Ethiopian highland agro-ecosystems, Michigan State University Press, 8, 1–18, 2001.

Prosdocimi, M., Cerdà, A., and Tarolli, P.: Soil water erosion on Mediterranean vineyards: A review, Catena, 141, 1–21, https://doi.org/10.1016/j.catena.2016.02.010, 2016.

Renard, K. G., Foster, G. R., Weesies, G. A., McCool, D. K., and Yoder, D. C.: Predicting soil erosion by water: A guide to conservation planning with the Revised Universal Soil Loss equation, Agriculture Handbook No. 703, U.S. Department of Agriculture, Washington, D.C., USA, 1997.

Robert, P. S. and Hilborn, D.: Factsheet: Universal Soil Loss Equation (USLE), Index No-572/751, Queen's printer for Ontario, Toronto, Canada, 2000.

Rodrigo Comino, J., Brings, C., Lassu, T., Iserloh, T., Senciales, J. M., Martínez Murillo, J. F., Ruiz Sinoga, J. D., Seeger, M., and Ries, J. B.: Rainfall and human activity impacts on soil losses and rill erosion in vineyards (Ruwer Valley, Germany), Solid Earth, 6, 823–837, https://doi.org/10.5194/se-6-823-2015, 2015.

SCRP (Soil Conservation Research Programme): Soil Conservation Research Project Database Report 1982–1993. Ministry of Agriculture and University of Berne, Series Report III, Hundelafto Research Unit, Institute of Geography, University of Berne, Berne, Switzerland, 1996.

SCRP (Soil Conservation Research Programme): Long-term monitoring of soil erosion and soil and water conservation in Afdeyu, Eritrea (1984–1998), Soil erosion and soil and water conservation database, Centre for Development and Environment, University of Berne, Berne, Switzerland, 2002.

Shi, Z. H., Cai, C. F., Ding, S. W., Li, Z. X., Wang, T. W., and Sun, Z. C.: Assessment of erosion risk with the RUSLE and GIS in the Middle and Lower Reaches of Hanjiang River, 12th ISCO Conference, 26–31 May 2002, Huazhong Agricultural University, Wuhan, 430070, Beijing, China, 2002.

Shiferaw, B. and Holden, S.: Soil erosion and smallholders' conservation decisions in the highlands of Ethiopia, World Dev., 27, 739–752, 1999.

Smith, P., Cotrufo, M. F., Rumpel, C., Paustian, K., Kuikman, P. J., Elliott, J. A., McDowell, R., Griffiths, R. I., Asakawa, S., Bustamante, M., House, J. I., Sobocká, J., Harper, R., Pan, G., West, P. C., Gerber, J. S., Clark, J. M., Adhya, T., Scholes, R. J., and Scholes, M. C.: Biogeochemical cycles and biodiversity as key drivers of ecosystem services provided by soils, SOIL, 1, 665–685, https://doi.org/10.5194/soil-1-665-2015, 2015.

Sonneveld, B. G. J. S. and Keyzer, M. A.: Land under pressure: soil conservation concerns and opportunities for Ethiopia, Land Degrad. Dev., 14, 5–23, 2003.

Sunday, E. O., Mohammed, M. B., John, C. N., Hermansah, Y. W., Charles, A., and Toshiyuki, W.: Soil degradation-induced decline in productivity of sub-Saharan African soils: the prospects of looking downwards the lowlands with the Sawah ecotechnology, Appl. Environ. Soil Sci., 2012, 673926, https://doi.org/10.1155/2012/673926, 2012.

Tadesse, G.: Land degradation: a challenge to Ethiopia, J. Environ. Manage., 27, 815–824, 2001.

Tadesse, M.: Living with adversity and vulnerability: Adaptive strategies and the role of trees in Konso, Southern Ethiopia, PhD Thesis, Swedish University of Agricultural Sciences, Uppsala, Sweden, 2010.

Taguas, E. V., Arroyo, C., Lora, A., Guzmán, G., Vanderlinden, K., and Gómez, J. A.: Exploring the linkage between spontaneous grass cover biodiversity and soil degradation in two olive orchard microcatchments with contrasting environmental and management conditions, SOIL, 1, 651–664, https://doi.org/10.5194/soil-1-651-2015, 2015.

Telles, T. S., Dechen, S. C. F., de Souza, L. G. A., and Guimarães, M. F.: Valuation and assessment of soil erosion costs, Sci. Agr., 70, 209–216, 2013.

USAID CRSPT: Amhara National Regional State food security research assessment report, University of Hawai'i, Hawai'i, USA, 2000.

Valera, C. A., Valle Jr., R. F., Varandas, S. G. P., Sanches Fernandes, L. F., and Pacheco, F. A. L.: The role of environmental land use conflicts in soil fertility: A study on the Uberaba River basin, Brazil, Sci. Total Environ., 562, 463–473, 2016.

Valle Jr., R. F., Varandas, S. G. P., Sanches Fernandes, L. F., and Pacheco, F. A. L.: Environmental land use conflicts: A threat to soil conservation, Land Use Policy, 41, 172–185, 2014.

Wischmeier, W. H. and Smith, D.: Predicting rainfall erosion losses: a guide to conservation planning, USDA-ARS Agriculture Handbook Number 537, Washington D.C., USA, 1978.

Yitbarek, T. W., Belliethathan, S., and Stringer, L. C.: The on-site cost of gully erosion and cost-benefit of gully rehabilitation: A case study in Ethiopia, Land Degrad. Dev., 23, 157–166, 2012.

Zhao, C., Gao, J., Huang, Y., Wang, G., and Zhang, M.: Effects of vegetation stems on hydraulics of overland flow under varying water discharges, Land Degrad. Dev., 27, 748–757, https://doi.org/10.1002/ldr.2423, 2015.

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Solid Earth

Tập 8 Số 1

13-25

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