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Radiation interception measurement in poplar: sample size and comparison between tube solarimeters and quantum sensors (Articolo in rivista)
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- Radiation interception measurement in poplar: sample size and comparison between tube solarimeters and quantum sensors (Articolo in rivista) (literal)
- Anno
- 1997-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/S0168-1923(96)02401-X (literal)
- Alternative label
Sattin M., Milne R., Deans J.D., Jarvis P.G. (1997)
Radiation interception measurement in poplar: sample size and comparison between tube solarimeters and quantum sensors
in Agricultural and forest meteorology (Print); Elsevier, Amsterdam (Paesi Bassi)
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- Sattin M., Milne R., Deans J.D., Jarvis P.G. (literal)
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- ISI Web of Science (WOS) (literal)
- Scopus (literal)
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- Centro di Studio sulla Biologia ed il Controllo delle Piante Infestanti--C.N.R.
Institute of Terrestrial Ecology, Bush Estate
Institute of Ecology and Resource Management, University of Edinburgh, (literal)
- Titolo
- Radiation interception measurement in poplar: sample size and comparison between tube solarimeters and quantum sensors (literal)
- Abstract
- Monitoring radiation interception requires frequent measurements of incoming and transmitted radiation through the
canopy. When planning and setting up such an experiment, the following must be taken into consideration: type of sensor to
be used, how many measurements (in space and time) to use, and the statistical reliability of the collected data. To answer
these and other questions, an experiment was carried out in Scotland using container-grown stands of three poplar clones.
The transmittance data were not normally distributed. The mean and variance of hourly, daily and weekly values of
transmittance, calculated using tube solarimeters or quantum sensors, were computed. The relationship between the mean
and the variance, for both types of sensor, showed a good fit to the model S 2 = ax b (where S 2 is the variance, x is the
mean, and a and b are equation parameters). The parameters of this equation have been used to determine the required
sample size for the two types of sensor on the basis of the standard error of the mean. The reliability of the average
transmittance does not change when considering the hourly, daily or weekly data. The standard error stabilises with 2-3 tube
solarimeters and with 3-5 quantum sensors. There are high standard errors only with very high transmittance using the
quantum sensors. The average seasonal ratio between the photosynthetic photon flux density (PPFD) and solar irradiance
(SI) of the incoming radiation was 1.90 mmol J- l. With closed canopies (LAI > 2.5), the transmittance measured with tube
solarimeters was as much as 4-8 times higher than that measured with quantum sensors. As a consequence, the fraction of
intercepted solar irradiance was lower than the fractional PPFD interception. The seasonal average radiation conversion ratio
based on PPFD and $I were 0.54 g mol-l and 1.21 g MJ-u, respectively (literal)
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