Long-Term Effects of Phosphorus on Dynamics of an Overseeded Natural Grassland in Brazil

Oliveira, Leandro Bittencourt de; Soares, Émerson Mendes; Jochims, Felipe; Tiecher, Tales; Marques, Anderson R.; Kuinchtner, Bruno Castro; Rheinheimer, Danilo dos Santos; Quadros, Fernando Luíz Ferreira de

doi:10.1016/j.rama.2015.07.012

Cited by 16 publications

(26 citation statements)

References 25 publications

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“…Our experimental plots were not weeded, and for that may introduce hidden forms of treatment, such as soil disturbances that may affect soil mineralization and other abiotic and biotic soil processes, which could in turn affect productivity, being in agreement with the results of Wardle (2001). Oliveira et al (2015) have found that phosphorus fertilization has only small effects on grassland composition an Ultisol at Southern of Brazil, which was evaluated over a period of sixteen years and during different seasons, as well as Henkin et al (2006) established during a five year study that phosphorus application significantly increased the productivity and the richness of annual legume species in a Mediterranean community.…”

Section: Resultssupporting

confidence: 85%

Relationship between Plant Species Diversity and Plant Biomass of Orchard Grass and Lucerne Sown in Different Ratios in the Province of Salamanca, Spain

Sierra¹,

Igual-Arroyo²,

Restrepo-Betancur³

et al. 2017

OJF

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A field experiment was carried out at the CSIC Muñovela farm belonging to the Spanish National Research Council (CSIC) in order to evaluate the effect of sowing orchard grass (Dactylis glomerata var. Trerano) and lucerne (Medicago sativa var. Aragon) in monoculture and in combination. The experiment was based on a randomized block designed with a factorial arrangement (5 × 2). Experimental units were 40 plots distributed in four blocks. The phosphorus fertilization (P) factor included two types of conditions: basal fertilization without phosphorus (−P) and basal fertilization with phosphorus (+P), and the vegetation cover factor (T) included five conditions depending on the grass (G) and the legume (L). Above-ground biomass showed statistically significant differences among seasons and years (P < 0.05). However, no statistically significant differences treatments were found among various treatments. The presence of the grass species Lolium perenne L. and Poa pratensis L. throughout the three years indicated that both species significantly increased their presence over time regardless of the treatments applied. The analysis performed for the other plant species (those other than grasses and legumes) allowed us to determine that the T1 and T5 treatments, which correspond to single species not treated with the application of phosphorus, influenced the presence of 70% of other species planted. Our specific aim was to explore how changing plant biotic diversity affects productivity under a given 337 Open Journal of Forestry set of conditions. We manipulated plant species richness as an experimental factor to determine if productivity would be affected by changes in the ratios of plants sown.

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Section: Resultssupporting

confidence: 85%

Relationship between Plant Species Diversity and Plant Biomass of Orchard Grass and Lucerne Sown in Different Ratios in the Province of Salamanca, Spain

Sierra¹,

Igual-Arroyo²,

Restrepo-Betancur³

et al. 2017

OJF

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“…In other native pasture types, this result was also verified. Previously, Oliveira et al (2015b) confirmed that P applied at 249 kg ha -1 , distributed throughout the winter of 1998, 2002, 2010 and 2012, in areas of native pasture fields in Rio Grande do Sul, Brazil, did not affect species diversity in the area studied during the experimental period.…”

Section: Resultssupporting

confidence: 58%

Dynamics of Herbaceous Vegetation in Caatinga Manipulated With Grazing Exclusion Under Phosphate Fertilization

et al. 2018

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The semi-arid region accounts for about 70% of the surface area of the Brazilian northeast, and the most important forage resource is the Caatinga, covering approximately 54% of this region. However, about 40% of this vegetation is in secondary succession. The areas in the process of degradation range from low to severe intensity, and total more than 20 million hectares, reflecting the intense use of the land, such as the overgrazing. The objective of this study was to evaluate the influence of different doses of phosphorus (0, 50 and 100 kg P2O5 ha-1 year-1) on the dynamics of herbaceous vegetation at different times of the year, in a Caatinga area manipulated without grazing for four years. The experiment was conducted at the Serra Talhada-UFRPE Academic Unit during the years 2015 and 2016. We used a randomised block design with three blocks and four replicates per block. Phosphate fertilisation in grazing exclusion areas promoted an increase in forage mass of the enriched Caatinga herbaceous stratum at all evaluation times, especially in the dry season of 2016, which showed values above the average of 7950 kg DM ha-1. In addition, it promoted an increase in the participation of buffelgrass in the floristic composition, increasing its involvement in the area to around 74% at the maximum dose of phosphorus used. Thus, phosphate fertilisation at up to 100 kg of P2O5 ha-1 year-1, together with grazing exclusion, can help to recover the Caatinga enriched with buffelgrass and optimise its use by reducing the formation of new grazing areas in the Caatinga.

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“…This composition is uniformly distributed in the study area [19]. Some studies have already been carried out in this experimental site with objectives focused on the study of the morphogenesis of native species [20,21]. The regional soil type is locally known as a "Planossolo Háplico Eutrofico" according to the exploratory map of soils of RS state [22].…”

Section: Site Descriptionmentioning

confidence: 99%

Evapotranspiration of the Brazilian Pampa Biome: Seasonality and Influential Factors

Rubert

Roberti

Pereira

et al. 2018

Water

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Experimentally characterizing evapotranspiration (ET) in different biomes around the world is an issue of interest for different areas of science. ET in natural areas of the Brazilian Pampa biome has still not been assessed. In this study, the actual ET (ETact) obtained from eddy covariance measurements over two sites of the Pampa biome was analyzed. The objective was to evaluate the energy partition and seasonal variability of the actual ET of the Pampa biome. Results showed that the latent heat flux was the dominant component in available energy in both the autumn–winter (AW) and spring–summer (SS) periods. Evapotranspiration of the Pampa biome showed strong seasonality, with highest ET rates in the SS period. During the study period, approximately 65% of the net radiation was used for the evapotranspiration process in the Pampa biome. The annual mean ET rate was 2.45 mm d−1. ET did not show to vary significantly between sites, with daily values very similar in both sites. The water availability in the Pampa biome was not a limiting factor for ET, which resulted in a small difference between the reference ET and the actual ET. These results are helpful in achieving a better understanding of the temporal pattern of ET in relation to the landscape of the Pampa biome and its meteorological, soil, and vegetation characteristics.

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Long-Term Effects of Phosphorus on Dynamics of an Overseeded Natural Grassland in Brazil

Cited by 16 publications

References 25 publications

Relationship between Plant Species Diversity and Plant Biomass of Orchard Grass and Lucerne Sown in Different Ratios in the Province of Salamanca, Spain

Relationship between Plant Species Diversity and Plant Biomass of Orchard Grass and Lucerne Sown in Different Ratios in the Province of Salamanca, Spain

Dynamics of Herbaceous Vegetation in Caatinga Manipulated With Grazing Exclusion Under Phosphate Fertilization

Evapotranspiration of the Brazilian Pampa Biome: Seasonality and Influential Factors

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