Root-Fusion Characteristic of Eucalyptus Trees Block Gully Development

Dalmas O. Sigunga, Makoto Kimura, Mitsuo Hoshino, Shuichi Asanuma, John C. Onyango

Graduate School of Bioagricultural Science, Nagoya University, Nagoya, Japan.
Maseno University, Maseno, Kenya.

DOI: 10.4236/jep.2013.49102                

Abstract

Soil erosion by water resulting in gully formation is a common occurrence in western Kenya. Establishment of local and sustainable countermeasures to prevent gully development/expansion in western Kenya is an urgent issue. This study presents the proposal to prevent gully development/expansion by planting Eucalyptus trees in gully prone regions. A survey study was undertaken in Kenya from 2008 to 2011. Roots of adjacent Eucalyptus citriodora trees fused forming a dense network of closely woven mass of root system holding large amount of soil thereby checking erosion by water and hence gully development. The network of roots among adjacent Eucalyptus trees also supported the standing and normal growth of the other Eucalyptus trees whose root systems were completely free from soil. Recognizable aging and breakdown of root networks were not observed during the survey period.

Keywords

Eucalyptus citriodora; Gully Erosion; Root-Fusion; Root System

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Central Bureau of Statistics, “Kenya Facts and Figures,” Ministry of Planning and National Development, Nairobi, 2006.
[2]	P. A. Sanchez, K. D. Shepherd, M. Soule, F. M. Place, R. J. Buresh, A. N. Izac, A. U. Mokwunye, F. R. Kwesiga, C. G. Nderitu and P. Woomer, “Soil Fertility Replenishment in Africa: An Investment in Natural Resource Capital,” In: R. J. Buresh et al., Eds., Replenishing Soil Fertility in Africa, SSSA Special Publication No. 5, Soil Science Society of America, Madison, 1997, pp. 1-46.
[3]	FAO, 2010. http://faostat.fao.org/site/567/default.aspx
[4]	C. G. Wenner, “Soil Conservation: Pocket Book for Technical Assistants,” Ministry of Agriculture, Nairobi, 1980, 33 pages.
[5]	C. G. Wenner, “Soil Conservation in Kenya,” Ministry of Agriculture, Nairobi, 1981, 49 pages.
[6]	M. Hoshino, Y. Katsurada, K. Yamamoto, H. Yoshida, M. Kadohira, K. Sugitani, J. M. Nyangaga, J. I. Kinyamario and E. K. Kangéthe, “Gully Erosion in Western Kenya,” The Geological Society of Japan, Vol. 110, No. 2, 2004, pp. 3-4.
[7]	M. Hoshino, “Soil Erosion and Conservation in Western Kenya,” Report of the Research Project No. (A) 152530 06 (2003-2005), the Grant-in-Aid for Scientific Research (Overseas Scientific Survey) from Japan Society for the Promotion of Science, 2006, p. 96.
[8]	Y. Katsurada, “Regional Scaled Mapping of Gully Erosion Sensitivity in Western Kenya,” African Journal of Environmental Science and Technology, Vol. 1, No. 3, 2007, pp. 49-52.
[9]	Y. Katsurada, M. Hoshino, K. Yamamoto, H. Yoshida and K. Sugitani, “Gully Retreat of Awach-Kano Gullies, Nyanza Province, Kenya: Field Measurements and Pixel-Based Upslope Catchment Assessment,” African Study Monographs, Vol. 28, No. 3, 2007, pp. 125-141.
[10]	D. O. Sigunga, M. Hoshino, J. C. Onyango, S. Asanuma and M. Kimura, “Pedological Perspective of Gully Erosion Sites within Kendu Escarpment-Sondu Miriu Region, West Kenya,” African Journal of Environmental Science and Technology, Vol. 5, 2011, pp. 1050-1059.
[11]	Anon. “A Guide to On-Farm Eucalyptus Growing in Kenya,” Kenya Forest Services, Nairobi, 2009, 36 pages.
[12]	P. O. Oballa, P. K. A. Konuche, M. N. Muchiri and B. N. Kigomo, “Facts on Growing and Use of Eucalyptus in Kenya,” Kenya Forestry Research Institute, Nairobi, 2010, 30 pages.