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Effects of continuous grazing on grassland structure

Introduction EFFECTS OF CONTINUOUS GRAZING AND The breeding of beef cattle is the predominant activity in the Flooding Pampa wet grasslands. EXCLUSION ON THE STRUCTURE OF MODIFIED The stocking rate of this region is increasing FCAYF because of livestock displaced by agriculture in FLOODIND PAMPA GRASSLAND IN ARGENTINA other regions. This increased load has been achieved through the alteration of grassland Oyhamburu, Estrella M., Agnelli, María L., Refi, Roberto 0., Ursino, Mario C. Facultad de Ciencias Agrarias y Forestales · Universidad Nacional de La Plata (UNLP) · www.agro.unlp.edu.ar · [email protected] with the use of herbicides and fertilizers or replacement thereof by pasture (Cahuepé and Hidalgo 2005). | TRIAL DESIGN MODIFIED MESOPHYTES LOCATION OMagdalena, Vieytes · Buenos Aires - Argentina 57° 07'W - 35* 01's 5/ha glyphosate | 1/ha 2.4 - D GRASSLAND Flooding Pampa wet grasslands "EL Amanecer" farm - UNLP 1.4 ha HSR 3EV /ha 1.9 ha LSR 2EV /ha Aim 1.9 ha LSR 2EV /ha The aim was to evaluate the effects of different stocking rate under continuous grazing and exclusion of it on the floristic composition and diversity of wet mesophytes prairie, modified during 10 years by the application of MONTHLY RAINFALL herbicides. Experimental period HSR 3EV /ha 1.4 ha LSR 2EV /ha 1.9 ha HSR 3EV /ha 1.4 ha GE 80 m2 Grazing was performed continuously from early June to late October in 2011 and from mid-May to late October in 2012. During the eperimental period both yeans showed very dferent weather conditions Methods Avrace . 2012 Treatments expressed in cow equivalent (EV) (Cocimano et al. 1975): Aberdeen Angus Frame Score 3 High Stocking Rate (HSR), 4.4 animals/ha Low Stocking Rate (LSR), 3 animals/ha DTAL BOOYWRCHT 2010 2011 Grazing Exclusion (GE). 164.3 Lolium multiflorum Bromus catharticus Gaudinia fragilis | RESULTS Effects of treatment, season and year on total vegetation cover (TVC), bare soil (BS) and litter (L), expressed as a percentage, and on the number of species (NS) and species diversity (H) Effects of treatment, season and year on the cover of grass (GC), legumes (LC), non-grass monocots (MC) and dicotyledonous forbs (DC), expressed as a percentage Treatments Seasons Years Treatments Seasons -Years Autuma Weter Spring 2011 LSR Autunn Spring 80.40.9a 80.1 1.0a 80.5 15a 89.0 1.1b 75.1 1.la 77.0 0.9a 84.01.1b 76.7 0.7a 67.5 0.8a 73.0 0.96 77.0 1.40 80.0 1.50 73.0 1.1b 69.0 0.9a 76.5 1.1b 69.10.7a HSR LSR HSR LSR Autumn Winter Spring Autumn Winter Spring 2011 2012 2011 2012 O Bare soll (%) O Litter (%) O Legumes (%) O Non-grass monocots (%) O Number of specles O Dicotyledonus forbs (%) O Species diversity 11.0 s Letters different means for p-0.01 Letters different means for p-0.01 14 Conclusions The outhors wish te edknowledge niversided Naclonal de le Plata, Buenos Aires, Argentina. In GE few species dominated with greater cover of as Carduus acanthoides and Ammi majus and the loss of Referes Brkart SE. MEGartulsy O Che rsvan X Ledn, MOesterteld, S erelman (200s) Las comunldades potndales del pastical panpeans boneree pp 3. En MOesterteld, MAAgulas CH Chena y M Parulo (eds). La heterogeneldad de la vegetadiin de los agrorcosistemas. Un homenaje aRlande Ledn. tatoraftad deAon ut Cahuep KAand LG Kidlige (2) La Panpe iundableeluse ganadera como tee de la stertabdad wd, oondla yanbletl, pe 4-2 EK Orsterteld, KRAglas, CK Ouray M Parvle (ed La hetergeneidatdelavegtacia e tarial fa etes eheee dete Sala OesterteliMK Len Rnd SerianA ) Graing ftets pen plantconnuity stctun le grasses and litter whereas under grazing dicots winter grass cover. These changes would accent when cover and bare soil had increase, in detriment of there is high variability in rainfall (2012). grasses. Results showed that the intensification of LSR had intermediate values. Its floristic composition grazing (HSR) can increase the presence of weeds would be more stable and sustainable in time. Carduus acanthoides Ammi majus uhumid galand of Agtaegettion © 2013 DAIANA MARTINEZ. ALL RIGHTS RESERVED.

Effects of continuous grazing on grassland structure

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Posters para el "22nd International Grasslands Congress" celebrado en Sydney, Australia; presentado por la Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata, Buenos Air...

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