Ratio of photosynthetically active to total incoming radiation above a Mediterranean deciduous oak forest

Proutsos, Nikolaos; Liakatas, A.; Alexandris, Stavros

doi:10.1007/s00704-019-02786-z

Cited by 14 publications

(9 citation statements)

References 70 publications

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“…of mean. Values, in the same column, followed by different letters are significantly different at P = 0.05 and hence higher rate of light absorption, photosynthesis, and plant growth (Proutsos et al 2019). However, the growth response of barley genotypes was different at the first and second samplings, as in the first sampling, Nosrat and 4Shur resulted in having significantly higher rates of canopy coverage, while in the second sampling, Fajr30 had the highest rate of canopy coverage.…”

Section: Discussionmentioning

confidence: 95%

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Light absorption and light extinction in barley (Hordeum vulgare L.) as affected by planting dates and plant genotypes

Kamali

Soleymani

2020

Theor Appl Climatol

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Plant light absorption and extinction may affect plant growth and yield. A split plot experiment (with three replications) was carried out in the Research Field of Agricultural College, Islamic Azad University, Isfahan, Iran, during 2011-2012 in order to determine the influence of light absorption and extinction on barley growth and yield. Planting dates including Oct 10th (P1), 25th (P2), and Nov 10th (P3) and plant genotypes including Nosrat (N), 4Shur (S), and Fajr 30 (F) were used as the main-and sub-plots, respectively. Plant growth and yield as well as crop light absorption and extinction were determined at different growth stages. Using a light meter, the rate of photosynthetically active radiation of canopy in the range of 400-700 nm was determined (41-57%). Light extinction coefficients (0.355-0.485) were also determined according to the Beer-Lambert law. Planting dates and genotypes significantly affected crop growth, yield, and response to light. S resulted in the highest rate of light extinction and absorption at P1 and P3, respectively, and it also resulted in the highest rate of grain yield (4228 kg ha −1 ) and harvest index (40.9). These results indicated the positive correlation between the growth and yield of barley genotypes with light absorption and extinction. Such findings can be used for a more efficient designing of a barley canopy with higher growth and yield.

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Section: Discussionmentioning

confidence: 95%

“…The effects of different agricultural practices on plant growth and yield production have been greatly investigated. However, more has yet to be researched on plant and climatic factors affecting canopy light properties including light absorption and light extinction (Proutsos et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Light absorption and light extinction in barley (Hordeum vulgare L.) as affected by planting dates and plant genotypes

Kamali

Soleymani

2020

Theor Appl Climatol

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“…Alados et al [4] recorded higher values in the summer months and lower values from November to January, in Granada, Spain. However, in Greece, Proutsos et al [47] recorded the highest values for autumn (September) while the lowest averages (March) were recorded in spring, with intermediate values for summer and winter. In Midwestern US [48], the lower values with smaller deviations were recorded in the summer months while the winter months showed higher values of the ratio with larger deviations.…”

Section: Temporal Variability Of the Q P /R S Ratiomentioning

confidence: 93%

Photosynthetic Active Radiation, Solar Irradiance and the CIE Standard Sky Classification

et al. 2020

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Plant growth is directly related to levels of photosynthetic photon flux density, Qp. The improvement of plant-growth models therefore requires accurate estimations of the Qp parameter that is often indirectly calculated on the basis of its relationship with solar irradiation, RS, due to the scarcity of ground measurements of photosynthetic photon flux density. In this experimental campaign in Burgos, Spain, between April 2019 and January 2020, an average value of the Qp/Rs ratio is determined on the basis of measurements at ten-minute intervals. The most influential factor in the Qp/Rs ratio, over and above any daily or seasonal pattern, is the existence of overcast sky conditions. The CIE standard sky classification can be used to establish an unequivocal characterization of the cloudiness conditions of homogeneous skies. In this study, the relation between the CIE standard sky type and Qp/Rs is investigated. Its conclusions were that the Qp/Rs values, the average of which was 1.93±0.15 μmol·J−1, presented statistically significant differences for each CIE standard sky type. The overcast sky types presented the highest values of the ratio, while the clear sky categories presented the lowest and most dispersed values. During the experimental campaign, only two exceptions were noted for covered and partial covered sky-type categories, respectively, sky types 5 and 9. Their values were closer to those of categories classified as clear sky according to the CIE standard. Both categories presented high uniformity in terms of illumination.

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“…DTR appears to have a strong (p<0.01) negative correlation with beehive productivity and can be explained considering that DTR is related to atmospheric cloudiness and solar radiation fluxes, both acknowledged as significant parameters affecting the photosynthetic activity of the plants and their growth (Gimeno et al, 2012;Gu et al, 2003;Proutsos et al, 2019;Proutsos and Tigkas, 2020). High DTR values (clear sky conditions) usually prevailing in summer are also associated with increased temperatures and VPD values.…”

Section: Variablementioning

confidence: 96%

How does weather impact on beehive productivity in a Mediterranean island?

Gounari

Proutsos

Goras

2022

IJAm

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Bee productivity is an essential factor affecting, not only the production of honey or other beehive products but also food security due to the very important role of bees as pollinators. The behavior of the bees and thus their productivity is highly affected by the weather fluctuations. In the present study, five years (2015-2019) of beehive weight data were analyzedto assess the impact of the prevailing weather conditions at an east Mediterranean island, on the productivity of bees. The results indicate that temperature and water-related parameters, significantly affect beehive productivity. Specifically, temperature optimum values of 17oC in spring and 26oC in summer, are associated with higher daily relative changes of the beehive weight, while bee productivity enhances at daily temperatures between 14 and 28oC, presenting negative values beyond this range. The effects of temperature, windspeed, diurnal temperature range, vapor pressure deficit, saturation vapor pressure, and the duration of hot and dry periods, on beehive productivity are strong and negative, whereas the effect of relative humidity is also significant but positive. The results of the study enhance the knowledge of the weather impacts on beehive production especially under the climatic conditions of a small east Mediterranean island, with applications in beekeepers scheduling and hive designing, to maximize beehive productivity.

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Ratio of photosynthetically active to total incoming radiation above a Mediterranean deciduous oak forest

Cited by 14 publications

References 70 publications

Light absorption and light extinction in barley (Hordeum vulgare L.) as affected by planting dates and plant genotypes

Light absorption and light extinction in barley (Hordeum vulgare L.) as affected by planting dates and plant genotypes

Photosynthetic Active Radiation, Solar Irradiance and the CIE Standard Sky Classification

How does weather impact on beehive productivity in a Mediterranean island?

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