Determination of Soil Loss by Erosion in Different Land Covers Categories and Slope Classes in Bovilla Watershed, Tirana, Albania

Authors: Valmir Baloshi, Fran Gjoka, Nehat Çollaku, Elvin Toromani

Abstract:

As a sediment production mechanism, soil erosion is the main environmental threat to the Bovilla watershed, including the decline of water quality of the Bovilla reservoir that provides drinking water to Tirana city (the capital of Albania). Therefore, an experiment with 25 erosion plots for soil erosion monitoring has been set up since June 2017. The aim was to determine the soil loss on plot and watershed scale in Bovilla watershed (Tirana region) for implementation of soil and water protection measures or payments for ecosystem services (PES) programs. The results of erosion monitoring for the period June 2017 - May 2018 showed that the highest values of surface runoff were noted in bare land of 38829.91 liters on slope of 74% and the lowest values in forest land of 12840.6 liters on slope of 64% while the highest values of soil loss were found in bare land of 595.15 t/ha on slope of 62% and lowest values in forest land of 18.99 t/ha on slope of 64%. These values are much higher than the average rate of soil loss in the European Union (2.46 ton/ha/year). In the same sloping class, the soil loss was reduced from orchard or bare land to the forest land, and in the same category of land use, the soil loss increased with increasing land slope. It is necessary to conduct chemical analyses of sediments to determine the amount of chemical elements leached out of the soil and end up in the reservoir of Bovilla. It is concluded that PES programs should be implemented for rehabilitation of sub-watersheds Ranxe, Vilez and Zall-Bastar of the Bovilla watershed with valuable conservation practices.

Keywords: ANOVA, Bovilla, land cover, slope, soil loss, watershed management.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.2571956

References:

[1] International Soil Conservation Organization (ISCO), 2002. 12th ISCO Congress Conference, May 26–31, Beijing, China.
[2] Phuong, T.Th., R. P. Shrestha, and Y. Yoshiki. “The impacts of land use change on soil erosion in Bo river watershed, central Vietnam”. International Symposium on Geoinformatics for Spatial Infrastructure Development in Earth and Allied Sciences 2012
[3] Grimm, M., R. Jones and L. Montanarella. Soil Erosion Risk in Europe. European Commission, Directorate General Jrc Joint Research Centre, Institute for Environment and Sustainability European Soil Bureau. EUR 19939 EN © European Communities 2001 (Revised June 2002) Printed in Italy.
[4] European Environment Agency, 1993. Water erosion in Europe https://www.eea.europa.eu›.
[5] Lai, Ch., Zh.Wang, X. Chen, Chong-Yu Xu, B. Yang, Q. Meng and B. Huang. “A procedure for assessing the impacts of land-cover change on soil erosion at basin scale”. © IWA Publishing 2016. Hydrology Research | 47.5 | 2016.
[6] Wijitkosum, S. “Impacts of Land Use Changes on Soil Erosion in Pa Deng Sub-district, Adjacent Area of Kaeng Krachan National Park, Thailand”. Soil & Water Res., 7, 2012 (1): 10–17.
[7] Khorsandi., N.: Evaluation of Land Use to Decrease Soil Erosion and Increase Income. Pol. J. Environ. Stud. Vol. 23, No. 4 (2014), 1329-1333
[8] Nunes, N., A. C. de Almeida and C. O.A. Coelho. Impacts of land use and cover type on runoff and soil erosion in a marginal area of Portugal. Applied Geography. Volume 31, Issue 2, April 2011, Pages 687-699
[9] Lima, J.E.F.W., W. T. A. Lopes, F. de Gois Aquino, E. C. Oliveria – Filho, E. E. Sano, F. D. M di Silva. Assessing the use of erosion modeling to support payment for environmental services program. Progress in Erosion and Sedimentation in Latin America. J Soils Sediments. DOI 10.1007/s11368-013-0821-0. Published online: 14 December 2013. Springer – Verlag Berlin Heidelberg 2013.
[10] Progress Report Preliminary Results of Sediments Monitoring in Bovilla Watershed (June-September 2017) Environmental Services Project "Study on sediment measurement and monitoring in Bovilla catchment", supported by The World Bank.
[11] Baloshi, V., F. Gjoka, E. Toromani, N. Çollaku. Potential soil erosion and sediment yield in Bovilla watershed. Soil erosion and sediment yield in Bovilla watershed. Agricultural University of Tirana. Albanian j. agric. sci. 2018; (Special edition, Proceedings - ICOALS, 2018).
[12] Panos Panagos, Pasquale Borrelli Jean Poesen, Cristiano Ballabio, Emanuele Lugato, Katrin Meusburger, Luca Montanarella, Christine Alewell, The new assessment of soil loss by water erosion in Europe. Environmental Science & Policy. Volume 54, December 2015, Pages 438-44.
[13] Research Group of Diava Consulting Company. Annual report, study on sediment measurement and monitoring. (Case study - Ulza basin. Unpublished Project Report (2018). World Bank & SIDA. Tirana.
[14] Peçuli, V. L’evapotraspirazione e il suo calcolo nel territorio della R.P.S. dell’Albania. Istituto Di Ecologia Agraria, Universita Degli Studi Perugia (1981), 22.