Seasonal variation in the vertical distribution of white clover stolons in grazed swards

Swards under rotational grazing by cattle (RGC) and under set stocking by sheep (SSS) were sampled every 2 months for 3 years, and white clover stolon dissected into 3 vertical classes; aerial, surface and buried. Despite large differences in yearly herbage production, sward structure, white clover content, total stolon weight and proportioning of stolon among the vertical classes between the sites, the greatest differences in distribution of stolon among the vertical classes were associated with month of sampling and this was consistent among years at both sites. These results indicate that over a 3-year period, in both swards studied, the white clover component underwent an annual cycle of burial of stolons in winter, re-emergence of growing points in spring and surface stolon development over summer. Keywords: white clover, Trifolium repens, stolons, vertical distribution, seasonal variation.

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The relationship between the vertical distribution and seasonal variation of limnetic species of Daphnia

SIL Proceedings 1922-2010 ◽

10.1080/03680770.1962.11895591 ◽

1964 ◽

Vol 15 (2) ◽

pp. 684-690

Author(s):

John Langdon Brooks

Keyword(s):

Seasonal Variation ◽

Vertical Distribution ◽

The Relationship ◽

The Vertical Distribution

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Daily inundation induced seasonal variation in the vertical distribution of soil water salinity in an estuarine mangrove forest under a tropical monsoon climate

Ecological Research ◽

10.1111/1440-1703.12118 ◽

2020 ◽

Vol 35 (4) ◽

pp. 638-649

Author(s):

Akira Komiyama ◽

Sasitorn Poungparn ◽

Suthathip Umnouysin ◽

Chadtip Rodtassana ◽

Shogo Kato ◽

...

Keyword(s):

Seasonal Variation ◽

Vertical Distribution ◽

Soil Water ◽

Mangrove Forest ◽

Water Salinity ◽

Monsoon Climate ◽

Tropical Monsoon ◽

The Vertical Distribution

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Seasonal variation in the vertical distribution of zone over Oakshin Gangotri, Antarctica

MAUSAM ◽

10.54302/mausam.v42i3.3232 ◽

2021 ◽

Vol 42 (3) ◽

pp. 275-278

Author(s):

A.L. KOPPAR ◽

S.C. NAGRATH

Keyword(s):

Seasonal Variation ◽

Vertical Distribution ◽

Early Spring ◽

The Other ◽

Late Winter ◽

Double Peak ◽

The Vertical Distribution

Ozone soundings made from Dakshin Gangotri, Antarctica during 1987 are presented. The vertical distribution of ozone over Antarctica is characterised by a double peak profile, one around 200-150 hPa and the other around 50 hPa. During late winter-early spring the upper peak is considerably depleted. Tropospheric ozoe remains low and nearly constant throughout the year.

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Effect of sward height and its clover vertical distribution on the performance of cashmere goats grazing perennial ryegrass/white clover swards during the autumn

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200596136 ◽

1997 ◽

Vol 1997 ◽

pp. 172-172

Author(s):

M. del Pozo ◽

K. Osoro

Keyword(s):

New Zealand ◽

Vertical Distribution ◽

Perennial Ryegrass ◽

White Clover ◽

Northern Spain ◽

Sward Height ◽

Cashmere Goats ◽

The Vertical Distribution ◽

Clover Pasture

Previous trials performed in temperate sown swards from New Zealand (Clark et al, 1982), from UK (del Pozo and Wright, 1995) and from Spain (Osoro and Martinez, 1995) showed improvements of sward clover contents on grass/clover pastures grazed by goats during the early part of the grazing season. However, this phenomenon might not occur to the same extent during autumn due to clover's poorer competitiviness with ryegrass. Additionally, Merchant and Riach (1994) showed that cashmere goats required pastures with mean sward heights to be above 6 cm to achieve aceptable levels of performance but were not able to considerate the implications of the sward legume content on their liveweight changes. The aim of this study was to investigate the effects of three contrasting sward height regimes and their associated relative changes in the vertical distribution of the sward clover proportion on the performance of cashmere goats grazing during the autumn season a lowland perennial ryegrass/white clover pasture located in Northern Spain.

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Vertical distribution, seasonality and troposphericity of ice-supersaturated air masses in the northern mid-latitudes from regular in-situ observations by passenger aircraft

10.5194/egusphere-egu2020-8992 ◽

2020 ◽

Author(s):

Andreas Petzold ◽

Susanne Rohs ◽

Mihal Rütimann ◽

Patrick Neis ◽

Berkes Florian ◽

...

Keyword(s):

Seasonal Variation ◽

Vertical Distribution ◽

North Atlantic ◽

Observation Data ◽

European Research ◽

Air Masses ◽

The North ◽

The North Atlantic ◽

Passenger Aircraft ◽

The Vertical Distribution

The vertical distribution and seasonal variation of water vapour volume mixing ratio (H2O VMR), relative humidity with respect to ice (RHice) and particularly of regions with ice-supersaturated air masses (ISSR) in the extratropical upper troposphere and lowermost stratosphere are investigated at northern mid-latitudes over the regions Eastern North America, the North Atlantic and Europe for the period 1995 to 2010.Observation data originate from regular and continuous long-term measurements of H2O VMR, temperature and RHice by instrumented passenger aircraft in the framework of the European research program MOZAIC which is continued as European research infrastructure IAGOS (from 2011; see www.iagos.org). The observation data are analysed with respect to the thermal and dynamical tropopauses, as provided by ERA-Interim. Additionally, collocated O3 observations from MOZAIC are used as tracer for stratospheric air masses.Our key results provide in-depth insight into seasonal and regional variability and tropospheric nature of ice-supersaturated air masses at various distances from the tropopause layer. For the vertical distribution and seasonal variation of ISSR occurrence we show a comparison of our results to radio soundings and to satellite observations of cirrus cloud occurrence from AIRS and TOVs Path B instruments. Finally, for all three regions, we investigate the trends and the dependencies of ISSR occurrence on the North Atlantic Oscillation (NAO) index.

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Seasonal variation of the crustacean fauna in the belowground and aboveground strata in a Halodule wrightii meadow of northeastern Brazil

Iheringia Série Zoologia ◽

10.1590/1678-4766e2017048 ◽

2017 ◽

Vol 107 (0) ◽

Author(s):

Kcrishna V. S. Barros ◽

Jesser F. Souza-Filho ◽

Ricardo J. C. Paiva ◽

Catarina L. Araújo-Silva ◽

Alexandre O. Almeida ◽

...

Keyword(s):

Spatial Distribution ◽

Seasonal Variation ◽

Vertical Distribution ◽

The Other ◽

Northeastern Brazil ◽

Halodule Wrightii ◽

The Vertical Distribution

ABSTRACT The different microhabitats provided by seagrasses and the habit of the species determinate the vertical distribution of crustaceans. This study verified the influence of the seasonality on the spatial distribution of the crustacean community associated with a Halodule wrightii meadow. From April 2006 to July 2007, we performed fifteen samplings in Goiabeiras Beach, Ceará State, each with five sectioned replicates in belowground and aboveground. Cumaceans and the amphipod Hyale media (Dana, 1853) had a higher frequency, density, and dominance than the other taxa, in both strata. The community exhibited gradual changes along the study, in both the belowground and aboveground strata, but the seagrass structure was not sufficient to explain the vertical distribution of the crustacean fauna along the time.

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Travelling disturbances in the ionosphere

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1950.0095 ◽

1950 ◽

Vol 202 (1069) ◽

pp. 208-223 ◽

Cited By ~ 94

Keyword(s):

Seasonal Variation ◽

Vertical Distribution ◽

Sudden Change ◽

Frequent Occurrence ◽

Vertical Movements ◽

Short Period ◽

The Mean ◽

The Vertical Distribution

Methods have been developed for the examination of the horizontal and vertical movements of short-period disturbances in the ionosphere. It has been found that quasi-periodic travelling disturbances with periods of from 10 to 60 min. are of frequent occurrence in the F region by day. They appear as temporary variations in the vertical distribution of ionization which show a horizontal progression and a vertical progression downwards. The horizontal directions of travel have a well-defined mean direction on most days. The mean direction shows a marked seasonal variation with a sudden change at each equinox. The horizontal rate of travel is usually between 5 and 10 km./min., and the rate of vertical progression downwards is approximately half the horizontal rate. The disturbances are considered to be variations of a compressional type in the atmosphere resulting in changes in the distribution of ionization.

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