Effect of long-term cattle grazing on root distribution and morphological characteristics of Brachiaria decumbens (Case study: tropical pasture, Malaysia)

Ajorlo, Majid; Ebrahimian, Mahboubeh; Abdullah, Ramdzani

doi:10.22059/jrwm.2014.52823

Document Type : Research Paper

Authors

¹ Assistant Professor, Faculty of Natural Resources, University of Zabol, Iran

² PhD Candidate, Faculty of Forestry, University Putra, Malaysia

³ Associate Professor, Faculty of Environmental Studies, University Putra, Malaysia

https://doi.org/10.22059/jrwm.2014.52823

Abstract

Root morphological and distribution responses of signal grass (Brachiaria decumbens) to long-term cattle grazing were examined in a tropical pasture in Malaysia. The treatments were no grazing by cattle and grazing at a moderate stocking density (2.7 animal unit/ha) under rotational grazing for 33 years. The method consists of taking soil core using a soil corer to a depth of 30 cm and extracting roots from cores by hand-washing and subsequent measuring of root morphological characteristics including length, surface area, average diameter and volume using WinRhizo Root Scanner. Root length density, mass density, surface area density, and volume density were calculated as indicators of root distribution pattern in the soil volume. Data were analyzed using repeated measure analysis of variance and independent t-test. Root diameter, length and length density were affected neither by grazing treatment nor the interaction between them (P > 0.05). Root diameters in the middle (10–20 cm) and lower (20–30 cm) soil layers of grazed site were 50% and 72% greater than that in the ungrazed site. Root volume, surface area and their densities were not affected (P > 0.05) by grazing and the interaction between grazing and soil depth. Mean root mass and mass density were affected (P < 0.05) by moderate grazing and soil depth, and the interaction between them. Mean root mass in all soil depths in grazed site was greater than that in the ungrazed site. Long-term rotational moderate grazing has no negative impact on root variables of signal grass in tropical pasture.

Keywords

References

[1] Arredondo, J.T. and Johnson, D.A. (1998). Clipping effects on root architecture and morphology of three range grasses. Journal of Range Management, 51, 207-214.

[2] Arredondo, J.T. and Johnson, D.A. (1999). Root architecture and biomass allocation of three range grasses in response to non-uniform supply of nutrients and shoot defoliation. New Phytologist, 143, 373-385.

[3] Arredondo, J.T. and Johnson, D.A. (2009). Root responses to short-lived pulses of soil nutrients and shoot defoliation in seedlings of three rangeland grasses. Rangeland Ecology and Management, 62, 470-479.

[4] Beyrouty, C.A., West, C.P. and Gbur, E.E. (1990). Root development of bermudagrass and tall fescue as affected by cutting interval and growth regulators. Plant and Soil, 127, 23-30.

[5] Bilotta, G.S., Brazier, R.E. and Haygarth, P.M. (2007). The impacts of grazing animals on the quality of soils, vegetation, and surface waters in intensively managed grasslands. Advances in Agronomy, 94, 237-280.

[6] Chen, Y., Lee, P., Lee, G., Mariko, S. and Oikawa, T. (2006). Simulating root responses to grazing of a Mongolian grassland ecosystem. Plant Ecology, 183, 265-275.

[7] Dawson, L.A., Grayston, S.J. and Paterson, E. (2000). Effects of grazing on the roots and rhizosphere of grasses. 61-84. In: Grassland Ecophysiology and Grazing Ecology, CABI Publishing, New York.

[8] Delgado, G.H.J., Aviless, L.R. and Vera, J.K. (2004). Root density in Panicum maximum cv. Tanzania monoculture and in a mixture with Leucaena leucocephala with different densities in Mexico. 20th International Grassland Congress, Dublin, Ireland, p.129.

[9] Derner, J.D. and Briske, D.D. (1999). Does a tradeoff exist between morphological and physiological root plasticity? A comparison of grass growth forms. Acta Oecology, 20, 519-526.

[10] Deutsch, E.S., Bork, E.W. and Willms, W.D. (2010). Soil moisture and plant growth responses to litter and defoliation impacts in parkland grasslands. Agriculture, Ecosystem and Environment, 135, 1-9.

[11] Engel, R.K., Nichols, J.T., Dodd J.L. and Brummer, J.E. (1998). Root and shoot responses of sand bluestem to defoliation. Journal of Range Management, 51, 42-46.

[12] Greenwood, K.L. and Hutchinson, K.J. (1998). Root characteristics of temperate pasture in New South Wales after grazing at three stocking rates for 30 years. Grass and Forage Science, 53, 120-128.

[13] Hendrickson, J. and Olson, B. (2006). Understanding plant response to grazing. 32-39. In: Launchbaugh, K. (ed.), Targeted grazing: A natural approach to vegetation management and landscape enhancement. American Sheep Industry Association, Denver, Colorado.

[14] Lodge, G.M. and Murphy, S.R. (2006). Root depth of native and sown perennial grass-based pastures, North-West Slopes, New South Wales. 1. Estimates from cores and effects of grazing treatments. Australian Journal of Experimental Agriculture, 45, 337-345.

[15] Milchunas, D.G. and Lauenroth, W.K. (1993). Quantitative effects of grazing on vegetation and soils over a global range of environments. Ecololgy Monograph, 63, 327-366.

[16] Miles, J.W., Maass, M.L. and Do Valle, C.B. (1996). Brachiaria: Biology, Agronomy, and improvement. CIAT publication. No. 259, Colombia.

[17] Mousel, E.M., Schacht, W.H., Zanner, C.W. and Moser, L.E. (2005). Effects of summer grazing strategies on organic reserves and root characteristics of big bluestem. Crop Science, 45, 2008-2014.

[18] Oliveira, M.R.G., Van Noordwijk, M. and Gaze, S.R. (2000). Auger sampling, ingrowth cores and pinboard methods. In Smit, A.L. et al. (ed.) Root methods. Springer-Verlag, Berlin.

[19] Piccolo, M.C. and Augusti, K.C. (2004). Root systems in tropical pasture restoration treatments inRondonia, Brazil. 20th International Grassland Congress, Dublin, Ireland, p. 187.

[20] Richards, J.H. (1984). Root growth response to defoliation in two Agropyron bunchgrasses: Field observations with an improved periscope. Oecologia, 64, 21-25.

[21] Van der Maarel, E. and Titlyanova, A. (1989). Above-ground and below-ground biomass relations in steppes under different grazing intensities. Oikos: Journal of Ecology, 56, 364-370.

Journal of Range and Watershed Managment

Effect of long-term cattle grazing on root distribution and morphological characteristics of Brachiaria decumbens (Case study: tropical pasture, Malaysia)

References

References

Volume 67, Issue 3 - Serial Number 3
December 2014
Pages 333-344

Effect of long-term cattle grazing on root distribution and morphological characteristics of Brachiaria decumbens (Case study: tropical pasture, Malaysia)

References

References

Volume 67, Issue 3 - Serial Number 3December 2014Pages 333-344

Volume 67, Issue 3 - Serial Number 3
December 2014
Pages 333-344