scholarly journals Is there a species spectrum within the world-wide leaf economics spectrum? Major variations in leaf functional traits in the Mediterranean sclerophyllQuercus ilex

2014 ◽  
Vol 205 (1) ◽  
pp. 79-96 ◽  
Author(s):  
Ülo Niinemets
Keyword(s):  
Functional Traits ◽  
World Wide ◽  
Leaf Functional Traits ◽  
Leaf Economics Spectrum ◽  
The World ◽  
The Mediterranean ◽  
Leaf Economics

Biogeographic constraints on the world-wide leaf economics spectrum

2012 ◽  
Vol 21 (12) ◽  
pp. 1137-1146 ◽  
Author(s):  
J. Mason Heberling ◽  
Jason D. Fridley
Keyword(s):  
World Wide ◽  
Leaf Economics Spectrum ◽  
The World ◽  
Leaf Economics

scholarly journals The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus fragrans Are Related to the Parasitism of Cuscuta japonica

2021 ◽  
Vol 11 (4) ◽  
pp. 1937
Author(s):  
Jiyou Zhu ◽  
Qing Xu ◽  
Jiangming Yao ◽  
Xinna Zhang ◽  
Chengyang Xu
Keyword(s):  
Host Plant ◽  
Chlorophyll Content ◽  
Functional Traits ◽  
Spectral Reflectance ◽  
Spectral Parameters ◽  
Osmanthus Fragrans ◽  
Leaf Functional Traits ◽  
Leaf Economics Spectrum ◽  
Cuscuta Japonica ◽  
Leaf Economics

Studies on the influence of parasitism on plants based on hyperspectral analysis have not been reported so far. To fully understand the variation characteristics and laws of leaf reflectance spectrum and functional traits after the urban plant parasitized by Cuscuta japonica Choisy. Osmanthus fragrans (Thunb.) Lour. was taken as the research object to analyze the spectral reflectance and functional traits characteristics at different parasitical stages. Results showed that the spectral reflectance was higher than those being parasitized in the visible and near-infrared range. The spectral reflectance in 750~1400 nm was the sensitive range of spectral response of host plant to parasitic infection, which is universal at different parasitic stages. We established a chlorophyll inversion model (y = −65913.323x + 9.783, R2 = 0.6888) based on the reflectance of red valley, which can be used for chlorophyll content of the parasitic Osmanthus fragrans. There was a significant correlation between spectral parameters and chlorophyll content index. Through the change of spectral parameters, we can predict the chlorophyll content of Osmanthus fragrans under different parasitic degrees. After being parasitized, the leaf functional traits of host plant were generally characterized by large leaf thickness, small leaf area, small specific leaf area, low relative chlorophyll content, high leaf dry matter content and high leaf tissue density. These findings indicate that the host plant have adopted a certain trade-off strategy to maintain their growth in the invasion environment of parasitic plants. Therefore, we suspect that the leaf economics spectrum may also exist in the parasitic environment, and there was a general trend toward the “slow investment-return” type in the global leaf economics spectrum.

scholarly journals The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus Fragrans are Related to the Parasitism of Cuscuta Japonica

2020 ◽  
Author(s):  
Jiyou Zhu ◽  
Qing Xu ◽  
Weijun He ◽  
Jiangming Yao ◽  
Xinna Zhang ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Functional Traits ◽  
Spectral Reflectance ◽  
Reflectance Spectrum ◽  
Parasitic Plants ◽  
Osmanthus Fragrans ◽  
Leaf Functional Traits ◽  
Leaf Economics Spectrum ◽  
Cuscuta Japonica ◽  
Leaf Economics

Abstract Background: Studies on the influence of parasitism on plants based on hyperspectral analysis have not been reported so far. To fully understand the variation characteristics and laws of leaf reflectance spectrum and functional traits after the urban plant parasitized by Cuscuta japonica Choisy. Osmanthus fragrans (Thunb.) Lour. was taken as the research object to analyze the spectral reflectance and functional traits characteristics at different parasitical stages. Results: Results showed that the spectral reflectance was higher than the parasitic reflectance in the visible light and near infrared. The spectral reflectance in 750 ~ 1400 nm was the sensitive range of spectral response of host plants to parasitic infection, which is universal at different parasitic stages. We established a chlorophyll inversion model (y=-65913.323x+9.783, R2=0.6888) based on the reflectance of red valley (minimum band reflectance in the range of 640 ~ 700 nm), which can be used for chlorophyll content of the parasitic Osmanthus fragrans. There was a significant correlation between spectral characteristic parameters and chlorophyll content index. Through the change of spectral parameters, we can predict the chlorophyll content of Osmanthus fragrans under different parasitism degrees.Conclusion: After the host plant was invaded by parasitic plants, its leaf functional traits are generally characterized by thick leaf, small leaf area, small specific leaf area, low relative chlorophyll content, high dry matter content and high leaf tissue density. These findings indicate that the host plant have taken certain trade-off strategy to maintain their growth in the environment invaded by parasitic plants. Therefore, we suspect that there may be leaf economics spectrum in the parasitic environment, and there was a general trend toward "slow investment-return" in the global leaf economics spectrum.

scholarly journals Digging into the roots: understanding direct and indirect drivers of ecosystem service trade-offs in coastal grasslands via plant functional traits

2021 ◽  
Vol 193 (S1) ◽  
Author(s):  
Miguel A. Cebrián-Piqueras ◽  
Juliane Trinogga ◽  
Anastasia Trenkamp ◽  
Vanessa Minden ◽  
Martin Maier ◽  
...  
Keyword(s):  
Land Use ◽  
Functional Traits ◽  
Environmental Gradients ◽  
Plant Functional Traits ◽  
Forage Production ◽  
Trade Off ◽  
Leaf Economics Spectrum ◽  
Ecosystem Properties ◽  
Trade Offs ◽  
Leaf Economics

AbstractRecent empirical and theoretical approaches have called for an understanding of the processes underpinning ecosystem service provision. Environmental gradients have shown effects on key plant functional traits that subsequently explain ecosystem properties of several systems. However, little is known concerning how associations between plant functional traits, including both below- and aboveground plant components, predict ecosystem properties and independently measured final ecosystem services. Here, we modeled (1) the responses of the leaf and plant economics spectrum, Plant size axis, and root growth to environmental gradients and (2) how associations between plant functional traits explain trade-offs and synergies between multiple ecosystem properties and final services. Forty-four plots were studied in a coastal marsh landscape of the German North Sea Coast. We used a partial least square structural equation model approach to test the hypothesized model. We found (1) a negative covariation between plant traits pertaining to a size axis and traits explaining both plant growth (roots and stems) and the leaf economics spectrum; (2) this trade-off responded significantly to the land use gradient and nutrient availability, which were both strongly driven by the groundwater gradient; (3) this trade-off explained an initial major trade-off between carbon stocks, at one extreme of the axis, and both the habitat value to conserve endangered plants and forage production for meat and dairy products at the other extreme. However, a secondary trade-off between nature conservation value and forage production, explained by a trade-off between leaf economics spectrum and plant growth in response to the land use intensity gradient, was also found.

Rotational Characteristics of the Green Solar Corona: 1947-1991

1994 ◽  
Vol 144 ◽  
pp. 139-141 ◽  
Author(s):  
J. Rybák ◽  
V. Rušin ◽  
M. Rybanský
Keyword(s):  
Solar Corona ◽  
World Wide ◽  
Rotation Period ◽  
Original Data ◽  
Coronal Emission ◽  
Time Intervals ◽  
Data Set ◽  
The World ◽  
Coronal Emission Line ◽  
Homogeneous Data

AbstractFe XIV 530.3 nm coronal emission line observations have been used for the estimation of the green solar corona rotation. A homogeneous data set, created from measurements of the world-wide coronagraphic network, has been examined with a help of correlation analysis to reveal the averaged synodic rotation period as a function of latitude and time over the epoch from 1947 to 1991.The values of the synodic rotation period obtained for this epoch for the whole range of latitudes and a latitude band ±30° are 27.52±0.12 days and 26.95±0.21 days, resp. A differential rotation of green solar corona, with local period maxima around ±60° and minimum of the rotation period at the equator, was confirmed. No clear cyclic variation of the rotation has been found for examinated epoch but some monotonic trends for some time intervals are presented.A detailed investigation of the original data and their correlation functions has shown that an existence of sufficiently reliable tracers is not evident for the whole set of examinated data. This should be taken into account in future more precise estimations of the green corona rotation period.

Dancing Across the World Wide Web: Advocacy in the 21st Century

2009 ◽  
Author(s):  
Blair Williams Cronin ◽  
Ty Tedmon-Jones ◽  
Lora Wilson Mau
Keyword(s):  
World Wide Web ◽  
21St Century ◽  
World Wide ◽  
The World
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