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Morphometric Attributes of Two Native Forage Species According to Water Source Distance in Semiarid Central Grasslands of Argentina

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PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY 2024年第8期93卷 2063-2074页

作者： Suarez, Carla Etel Rossini, Maria Sol Morici, Ernesto Francisco Atilio Esterlich, Hector Daniel UNLPam Fac Agron Lab Ecol Ambientes Semiaridos Ecol Vegetal RA-6300 Santa Rosa Argentina UNLPam Fac Agron CONICET APN RA-6300 Santa Rosa Argentina UNLPam Fac Ciencias Vet RA-6360 Gen Pico Argentina

The semiarid grasslands of Argentina ' s central region have been modi fi ed by domestic livestock grazing, both in their composition and structure. The increase in the proportion of woody and non-forage species and the decrease in forage species are some of the most evident results of this process. There is limited available information about the effect of differential grazing pressures on morphometric attributes of native species, and it also depends on the life histories of the species in this grassland. The objective of this work was to evaluate some morphometric aspects in the grasses Poa ligularis Nees ex Steud and Piptochaetium napostaense (Speg.). Hack according to distance from the water source in communities in the central semiarid region of Argentina. The study area included areas of low grassland, golden forests, and secondary forests in grasslands (6 fi elds with 9 paddocks). Grazing pressure was established based on the distance to the water source, so sampling areas were designated near the water source (grazing pressure is greater) and far from the water source (grazing pressure light) in each of the pastures. In both species, specimens were selected at random, and the following attributes were measured: crown diameter at ground level (cm), burial depth (cm), average tiller weight per plant (g. Marcello - 1 ), and the density of tillers per unit of crown surface (*** - 2 crown). The morphometric attributes evaluated showed differences according to the distance to the watering hole and in the different pastures. Both species presented similar behaviors for the attributes. There were signi fi cant differences in the depth of burial and the average weight of tillers per plant, being greater in the areas close to the water source. Regarding the distance to the watering hole, there were no signi fi cant differences in crown diameter and tiller density, but the highest values were recorded for the former near the watering hole and for the second far

关键词： Grazing pressure tiller density tiller weight crown burial depth Poa ligularis Piptochaetium napostaense GRASSES DEFOLIATION TOLERANCE LIVESTOCK HERBIVORY

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Structural and Production Characteristics of PiatãGrass Forage Submitted to Levels of Nitrogen

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American Journal of Plant Sciences 2015年第5期6卷 693-701页

作者： Ronaldo Liberato Dourado Alexandre Lima de Souza Anderson de Moura Zanine Fabio Luiz Buranelo Toral Daniele de Jesus Ferreira Joadil Goncalves de Abreu Department of Science and Technology Federal Institute of EducationBrasiliaBrazil Department of Animal Science Federal University of Mato GrossoCuiabáBrazil Department of Animal Science Federal University of Minas GeraisBelo HorizonteBrazil

Piatã grass (Brachiaria brizantha cv. Piatã) is a tropical grass cultivating in pasture production system. The aim of this study was to evaluate the effects of nitrogen levels (0, 125, 250, 375 and 500 kg·N·ha-1) on structural characteristics and forage production of Piatã grass. The experiment comprised of twenty grass parcels arranged in randomised completely casualties design. This study was carried out between November of 2007 and April of 2008, with 175 experimental days. A quadratic effect (P ·m-2 at a nitrogen dose of 357 kg·ha-1. A quadratic effect (P ·ha-1·year-1?for nitrogen levels of 411 and 384 kg·ha-1, respectively. However, a considerable portion of forage production obtained by nitrogen addition occurred from stem production. The productions of green leaf blade dry matter, tiller density, leaf blade length and leaf blade index are all variables related to structural aspects and pasture quality, with all attaining their highest values at a mean nitrogen application level of 380 kg·ha-1.

关键词： Forage Accumulation Frequencies Cuts Leaf Area Index tiller density

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The effect of vegetative cover in the erosion prevention of a cattle trodden slope pasture

The effect of vegetative cover in the erosion prevention of ...

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ⅩⅪ International Grassland Congress and the Ⅷ International Rangeland Congress

作者： T.N.Pande H.Yamamoto National Agricultural Research Organization National Institute of Livestock and Grassland Science ShionoJapan

＜正＞Introduction Grazing is the effective means of harvesting energy and protein from steep pastures in mountainous country. However,there are risks associated with the practice,such as degradation of the soils that sustain pasture communities. Details of the effect of vegetative cover of a grazed pasture on soil loss with runoff water are not clearly understood.

关键词： vegetation cover tiller density soil loss slope pasture Japan

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