1991
DOI: 10.18174/njas.v39i3.16539
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Horizontal and vertical distribution of wind speed in a vegetation canopy.

Abstract: Wind speed measurements within a maize row canopy were carried out to investigate the horizontal and vertical variability of the mean wind speed and its standard deviation. Attention was given to finding adequate scaling parameters of the within-canopy wind speed profiles under various atmospheric stratification states. A validation of existing model simulations was also carried out. The horizontal mean wind speed and its standard deviation can vary about 20% from its spatial mean value. During day time and ni… Show more

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Cited by 6 publications
(3 citation statements)
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“…The unconditioned data were recorded on digital magnetic tape for analysis at a later time. Additional details concerning the measurement techniques are provided in Jacobs and Van Boxel ( 1991 ).…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…The unconditioned data were recorded on digital magnetic tape for analysis at a later time. Additional details concerning the measurement techniques are provided in Jacobs and Van Boxel ( 1991 ).…”
Section: Methodsmentioning
confidence: 99%
“…Mainly because of the loss of long-wave radiation, the above-canopy stratification becomes sta-0168-1923/92/$05.00 © 1992 Elsevier Science Publishers B.V. All rights reserved. ble, while the within-canopy stratification often shows a clearly unstable stratification due to the supply of heat from the soil (Hosker et al, 1974;Jacobs and Van Boxel, 1991 ).…”
Section: Introductionmentioning
confidence: 99%
“…A quantidade de N no solo (g parcela -1 ) após o período experimental (7 dias (BOARETTO et al, 2013;STEWART, 1993;OLESEN;CHRISTENSEN, 1991;TRIVELIN et al, 2002;VITTI et al, 2007). Entretanto, fatores inerentes à planta, como a área foliar, também podem ter influenciado a volatilização da amônia, uma vez que maior área foliar pode proporcionar maior cobertura do solo, podendo diminuir a energia incidente, a temperatura ao nível do solo e a taxa de evaporação de água (DALMAGO et al, 2010) CANTARELLA et al, 2003b;FENILLI et al, 2007;BOXEL, 1991;TRIVELIN et al, 2002), no presente estudo, estes fatores não variaram entre as épocas de aplicação da ureia, pois foram controlados pela reposição diária de água nas bandejas e pelo isolamento lateral das plantas com lona plástica. ---------QNV -------------------AF --------------------CTN -------- (FALLER, 1972;HUTCHINSON;MILLINGTON;PETERS, 1972;WHITEHEAD, 1986;ROGERS;ANEJA, 1980;LOCKYER, 1987;ZHANG et al, 2011) (MATTOS JÚNIOR et al, 2003), contribuindo, assim, para a absorção do NH 3 pelas folhas, devido a manutenção dessa forma de N por mais tempo no dossel da cultura.…”
Section: Methodsunclassified