The role of sky conditions on gross primary production in a mixed deciduous forest

Oliphant, A. J.; Dragoni, D.; Deng, Bin; Grimmond, Sue; Schmid, Hans‐Peter; Scott, Steve

doi:10.1016/j.agrformet.2011.01.005

Cited by 101 publications

(106 citation statements)

References 25 publications

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“…In most LUE models to date, the influences of these factors on LUE are considered through the use of various scalars defined with empirical functions and coefficients [11,17,18]. Such simplification for LUE estimation definitely induces considerable uncertainties in calculated GPP [19][20][21][22][23]. Proper determination of this parameter is a prerequisite and also a challenge for calculating GPP using remote sensing data and LUE models at regional and global scales.…”

Section: Introductionmentioning

confidence: 99%

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Zhang

Chen

et al. 2015

Remote Sensing

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Light use efficiency (LUE) models are widely used to estimate gross primary productivity (GPP), a dominant component of the terrestrial carbon cycle. Their outputs are very sensitive to LUE. Proper determination of this parameter is a prerequisite for LUE models to simulate GPP at regional and global scales. This study was devoted to investigating the ability of the photochemical reflectance index (PRI) to track LUE variations for a sub-tropical planted coniferous forest in southern China using tower-based PRI and GPP measurements over the period from day 101 to 275 in 2013. Both half-hourly PRI and LUE exhibited detectable diurnal and seasonal variations, and decreased with increases of vapor pressure deficit (VPD), air temperature (Ta), and photosynthetically active radiation (PAR). Generally, PRI is able to capture diurnal and seasonal changes in LUE. However, correlations of PRI with LUE varied dramatically throughout the growing season. The correlation was the strongest (R 2 = 0.6427, p < 0.001) in July and the poorest in May. Over the entire growing season, PRI relates better to LUE under clear or partially cloudy skies (clearness index, CI > 0.3) with moderate to high VPD (>20 hPa) and high temperatures (>31˝C). Overall, we found that PRI is most sensitive to variations in LUE under stressed conditions, and the sensitivity decreases as the growing conditions become favorable when atmosphere water vapor, temperature and soil moisture are near the optimum conditions.

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Section: Introductionmentioning

confidence: 99%

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Zhang

Chen

et al. 2015

Remote Sensing

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“…First, in the forest canopy, lower leaves are normally light-limited on a clear day when light is mostly direct, while diffuse light penetrates deeper into the forest canopy (Hollinger et al, 1994;Oliphant et al, 2011). Second, relative to direct, diffuse light is distributed across more leaves, leading to lower light saturation and photoinhibition in upper canopy leaves.…”

Section: Introductionmentioning

confidence: 99%

Effects of light-diffusing plastic film on lettuce production and quality attributes

Riga

Benedicto

2017

Span. j. agric. res.

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In general, plants grown under diffuse light yield higher biomass than those grown under direct light as a result of a more uniform distribution of the light across the plant canopy. We compared the effects of a light-diffusing plastic film and a clear plastic film on growth of Batavia lettuce (Lactuca sativa L.) in two greenhouses during five growth periods. Lettuce grown under the light-diffusing film were smaller (up to 36%) than control plants grown under the clear film, due to the fewer leaves per plant (up to 22%) and lower mean values of individual leaf area (up to 29%). The photosynthetically active radiations use efficiency was sometimes lower (up to 23%) in lettuces grown under the light-diffusing film. The pigment contents tended to be lower in plants grown under the light-diffusing plastic. The total macroelement contents of the lettuces grown under the light-diffusing plastic were up to 10% higher than in the lettuces grown under clear plastic, mainly as a result of higher leaf K contents (up to 19% higher). In addition, use of the light-diffusing plastic tended to increase leaf nitrate contents (by up to 23%). The leaf solid soluble content and acidity values were higher in the lettuces grown under the light-diffusing plastic, while leaf pH values were lower than in the control plants. The findings showed that the light-diffusing plastic was detrimental to production of compact heads of lettuce, and to some quality parameters such as nitrate and pigment contents. Nevertheless, open-leaf cultivars would likely show a different response to the diffuse light Additional key words: diffuse light; Lactuca sativa; light use efficiency; vegetable production.Correspondence should be addressed to Patrick Riga: priga@neiker.eusAbbreviations used: Car (carotenoids); CC (construction cost); dw (dry weight); fw (fresh weight); LUE (light use efficiency); NR (nitrate reductase); PAR (photosynthetically active radiations); PV (photovoltaic solar panel); RH (relative humidity); SLA (specific leaf area); SSC (soluble solids content).

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“…Ancillary and biological data include soil moisture and temperature, leaf area index (LAI) and vegetation height (h) were also acquired. A summary of the sites including locations, climate conditions, vegetation types, vegetation and soil parameters as well as study periods is listed in Table 1 [49][50][51][52][54][55][56][57], and soil moisture conditions during the study period for each site are shown in Figure 2.…”

Section: Study Site and Datamentioning

confidence: 99%

“…Four sites within the AmeriFlux network were used in this study to validate the model performance, including one deciduous broadleaf forest site (Morgan Monroe State Forest, US_MMS) [49], one woody savannas site (Flagstaff Managed Forest, US_Fmf) [50], one grassland site (Vaira Ranch, US_Var) [51], and one cropland site (Bondville, US_Bo1) [52]. For each site, continuous records of half-hourly meteorological and latent heat flux measurements from eddy covariance (EC) towers were obtained from the AmeriFlux Web site [53].…”

Section: Study Site and Datamentioning

confidence: 99%

A Hybrid Dual-Source Model of Estimating Evapotranspiration over Different Ecosystems and Implications for Satellite-Based Approaches

Liu

Yao

2014

Remote Sensing

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Accurate estimation of evapotranspiration (ET) and its components is critical to developing a better understanding of climate, hydrology, and vegetation coverage conditions for areas of interest. A hybrid dual-source (H-D) model incorporating the strengths of the two-layer and two-patch schemes was proposed to estimate actual ET processes by considering varying vegetation coverage patterns and soil moisture conditions. The proposed model was tested in four different ecosystems, including deciduous broadleaf forest, woody savannas, grassland, and cropland. Performance of the H-D model was compared with that of the Penman-Monteith (P-M) model, the Shuttleworth-Wallace (S-W) model, as well as the Two-Patch (T-P) model, with ET and/or its components (i.e., transpiration and evaporation) being evaluated against eddy covariance measurements. Overall, ET estimates from the developed H-D model agreed reasonably well with the ground-based measurements at all sites, with mean absolute errors ranging from 16.

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The role of sky conditions on gross primary production in a mixed deciduous forest

Cited by 101 publications

References 25 publications

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Effects of light-diffusing plastic film on lettuce production and quality attributes

A Hybrid Dual-Source Model of Estimating Evapotranspiration over Different Ecosystems and Implications for Satellite-Based Approaches

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