A modified nonrectangular hyperbola equation for photosynthetic light-response curves of leaves with different nitrogen status

Xu, Junzeng; Yu, Ying; Peng, Shaobing; Yang, Shihong; Liao, Linxian

doi:10.1007/s11099-014-0011-3

Cited by 30 publications

(33 citation statements)

References 43 publications

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“…The Rd significantly 6 irradiance were able to maximize photosynthesis if CMR values were higher than 53 (about 2% of total N). The increase in maximum photosynthetic rate and light saturation point with higher CMR readings or N availability found in this study were also described by Lin et al (2013) in oats and by Xu et al (2014) in rice. The better relationship obtained between CMR readings and light-saturated photosynthesis with measurements on July 27th and August 17 th 2011 compared to the earlier instantaneous gas exchange measurements on June 23 rd and July 7 th can indicate that leaf photosynthesis became more limited by N availability later in the growing season.…”

Section: Discussionsupporting

confidence: 83%

Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions

Climente

Castillo

Salmerón

2017

Span. j. agric. res.

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There are limited studies about the effect of nitrogen (N) deficiency on leaf growth, N status, and photosynthetic capacity of maize grown under field conditions in a Mediterranean climate. The objective of this work was to evaluate the effect of different levels of mineral N availability on leaf gas exchange parameters of sprinkler irrigated maize. The experiment was conducted in a conventional maize field located in the central part of the Ebro valley (Spain) during two seasons. Using a portable LICOR-6400 equipment, instantaneous measurements and light response curves to gas exchange were conducted in plots with different levels of N supply ranging from deficient (no fertilized) to over-fertilized (300 kg N/ha). In addition to gas exchange measurements, mineral soil N content, chlorophyll meter readings (CMR), leaf N content, and grain yield were measured in the different plots. Results showed that grain yield reached a plateau (14.5 Mg/ha) when the mineral N available was about 179 kg/ha. CMR were linearly and highly related to total N in ear leaves. The relationship between light-saturated leaf photosynthesis measurements and CMR was significant but very weak (R2=0.13) at V8 and V14 stages but increased later in the growing season (R2=0.52). Plants with intermediate levels of N supply (48<CMR<54) tended to have slightly higher assimilation rates than plants with higher CMR readings. As the available N increased, the saturation point, the light compensation point and significant increases of dark respiration rate were observed. Under the conditions of the study, leaf N contents of 1.9% in the ear leaf were enough to maximize leaf assimilation rates with no need to over-fertilize the maize crop.

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Section: Discussionsupporting

confidence: 83%

Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions

Climente

Castillo

Salmerón

2017

Span. j. agric. res.

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“…The A max , AQY and R d are not only important photosynthetic indicators but also core parameters for determining the shape of the PLR curve (Equation (2)). Thus, many studies have linked leaf traits [11,16,32,91] or environmental conditions [20,29] in the PLR models based on their correlations with the A max , AQY and R d to resolve the problem of parameter variation among different species or environments. In this study, we comprehensively considered the influence of spatial position, leaf traits and environmental conditions on leaf photosynthesis and then linked the RDINC, LMA and VPD in the PLR model to extend the PLR model from a single leaf to the whole crown and render the model sufficiently flexible to be applied in different conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have suggested that incorrect simulations usually occur when modeling long-term carbon uptake if the spatial and seasonal variations in photosynthesis [46,[92][93][94][95] or leaf traits [96,97] are neglected. Some scientists have successfully incorporated leaf traits [11,16,29,32,91] and environmental conditions [20,29] into the PLR model to extend the model from a single leaf to a larger scale. However, these models are limited in their application because they only describe the response of the A n to PAR in different conditions and do not describe the dynamic simulation of the A n .…”

Section: Discussionmentioning

confidence: 99%

Dynamic Simulation of the Crown Net Photosynthetic Rate for Young Larix olgensis Henry Trees

Liu

Xie

2019

Forests

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Numerical integration of the instantaneous net photosynthetic rate (An) is a common method for calculating the long-term CO2 uptake of trees, and accurate dynamic simulation of the crown An has been receiving substantial attention. Tree characteristics are challenging to assess given their aerodynamically coarse crown properties, spatiotemporal variation in leaf functional traits and microenvironments. Therefore, the variables associated with the dynamic variations in the crown An must be identified. The relationships of leaf temperature (Tleaf), the vapor pressure deficit (VPD), leaf mass per area (LMA) and the relative depth into the crown (RDINC) with the parameters of the photosynthetic light-response (PLR) model of Larix olgensis Henry were analyzed. The LMA, RDINC and VPD were highly correlated with the maximum net photosynthetic rate (Amax). The VPD was the key variable that mainly determined the variation in the apparent quantum yield (AQY). Tleaf exhibited a significant exponential correlation with the dark respiration rate (Rd). According to the above correlations, the crown PLR model of L. olgensis trees was constructed by linking VPD, LMA and RDINC to the original PLR equation. The model performed well, with a high coefficient of determination (R2) value (0.883) and low root mean square error (RMSE) value (1.440 μmol m−2 s−1). The extinction coefficient (k) of different pseudowhorls within a crown was calculated by the Beer–Lambert equation based on the observed photosynthetically active radiation (PAR) distribution. The results showed that k was not a constant value but varied with the RDINC, solar elevation angle (ψ) and cumulative leaf area of the whole crown (CLA). Thus, we constructed a k model by reparameterizing the power function of RDINC with the ψ and CLA, and the PAR distribution within a crown was therefore well estimated (R2 = 0.698 and RMSE = 174.4 μmol m−2 s−1). Dynamic simulation of the crown An for L. olgensis trees was achieved by combining the crown PLR model and dynamic PAR distribution model. Although the models showed some weakened physiological biochemical processes during photosynthesis, they enabled the estimation of long-term CO2 uptake for an L. olgensis plantation, and the results could be easily fitted to gas-exchange measurements.

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“…The photosynthetic light response curve, which describes the relationship between leaf photosynthetic rate and light levels (PPFD), helps to characterize plant photosynthetic capacity [15,23]. Here, we used this method to estimate carbon assimilation variables across different seasons and found that the light response curve was saturated at a lower PPFD during the dry season.…”

Section: Discussionmentioning

confidence: 99%

Three-Year Study on Diurnal and Seasonal CO2 Sequestration of a Young Fraxinus griffithii Plantation in Southern Taiwan

Chen

Wang

Lih

et al. 2016

Forests

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Abstract:This study examined monthly carbon sequestration of the Himalayan ash (Fraxinus griffithii C. B. Clarke), an important plantation species in Taiwan. From January 2010 to December 2012, data were collected from an F. griffithii plantation in southern Taiwan, which experiences a typical Southeast Asia monsoon climate. To estimate CO 2 sequestration rate, we conducted diurnal measurements of photosynthetic rates and seasonal measurements of photosynthetic light response curves. We also calculated leaf area index to estimate the total leaf area of individual trees. The diurnal variation in photosynthetic rate, stomatal conductance, and transpiration exhibited seasonal and annual differences. The range of net CO 2 assimilation rates was 1.34-8.68 µmol·m −2 ·s −1 in 2010, 1.02-6.60 µmol·m −2 ·s −1 in 2011, and 1.13-4.45 µmol·m −2 ·s −1 in 2012. A single F. griffithii tree sequestrated 12.21 kg·year −1 CO 2 on average. Annual CO 2 sequestration occurred primarily during the summer for all years, averaging 14.89 Mg·ha −1 ·year −1 for three years. Correlation analyses between various environmental variables and CO 2 sequestration rates indicated that air temperature and soil water content were likely the main factors influencing carbon sequestration of F. griffithii at this study site.

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A modified nonrectangular hyperbola equation for photosynthetic light-response curves of leaves with different nitrogen status

Cited by 30 publications

References 43 publications

Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions

Nitrogen availability effects on gas exchange measurements in field-grown maize (Zea mays L.) under irrigated Mediterranean conditions

Dynamic Simulation of the Crown Net Photosynthetic Rate for Young Larix olgensis Henry Trees

Three-Year Study on Diurnal and Seasonal CO2 Sequestration of a Young Fraxinus griffithii Plantation in Southern Taiwan

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