scholarly journals Hyperspectral Estimation of the Chlorophyll Content in Short-Term and Long-Term Restorations of Mangrove in Quanzhou Bay Estuary, China

2018 ◽  
Vol 10 (4) ◽  
pp. 1127 ◽  
Author(s):  
Zhiguo Dou ◽  
Lijuan Cui ◽  
Jing Li ◽  
Yinuo Zhu ◽  
Changjun Gao ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Hyperspectral Data ◽  
Band Spectrum ◽  
Band Model ◽  
Wave Band ◽  
Short Term ◽  
Full Wave ◽  
Red Edge ◽  
Red Edge Position

The chlorophyll content can indicate the general health of vegetation, and can be estimated from hyperspectral data. The aim of this study is to estimate the chlorophyll content of mangroves at different stages of restoration in a coastal wetland in Quanzhou, China, using proximal hyperspectral remote sensing techniques. We determine the hyperspectral reflectance of leaves from two mangrove species, Kandelia candel and Aegiceras corniculatum, from short-term and long-term restoration areas with a portable spectroradiometer. We also measure the leaf chlorophyll content (SPAD value). We use partial-least-squares stepwise regression to determine the relationships between the spectral reflectance and the chlorophyll content of the leaves, and establish two models, a full-wave-band spectrum model and a red-edge position regression model, to estimate the chlorophyll content of the mangroves. The coefficients of determination for the red-edge position model and the full-wave-band model exceed 0.72 and 0.82, respectively. The inverted chlorophyll contents are estimated more accurately for the long-term restoration mangroves than for the short-term restoration mangroves. Our results indicate that hyperspectral data can be used to estimate the chlorophyll content of mangroves at different stages of restoration, and could possibly be adapted to estimate biochemical constituents in leaves.

scholarly journals LEAF CHLOROPHYLL CONTENT ESTIMATION IN THE MONARCH BUTTERFLY BIOSPHERE RESERVE

2010 ◽  
Vol 33 (2) ◽  
pp. 175
Author(s):  
Ma. Luisa España-Boquera ◽  
Philippe Lobit ◽  
Vilma Castellanos-Morales
Keyword(s):  
Chlorophyll Content ◽  
Vegetation Indices ◽  
Biosphere Reserve ◽  
Monarch Butterfly ◽  
Hyperspectral Reflectance ◽  
Plant Leaves ◽  
Red Edge ◽  
Monarch Butterfly Biosphere Reserve ◽  
Leaf Composition ◽  
Red Edge Position

Chlorophyll is an essential element of photosynthesis and its content in plant leaves indicates their photosynthetic capacity as well as the presence of stress or diseases. The purpose of this work was to evaluate the feasibility of estimating chlorophyll content in the Monarch Butterfly Biosphere Reserve forest (Sierra Chincua sanctuary, México) based on vegetation indices calculated by using hyperspectral reflectance measurements of plant leaves. This study focused on oyamel (Abies religiosa L.) which is the main tree specie of this area. Leaf samples were taken on 140 trees and analyzed for chlorophyll a and b, nitrogen and carbon content. The hyperspectral reflectance spectra were measured on each sample and different vegetation indices were calculated. Results showed that the indices best correlated with chlorophyll content were the red edge position index (r = 0.531) and the red edge position chlorophyll reflectance index (r = 0.506), followed by the MERIS terrestrial chlorophyll index (r = 0.497) and the green chlorophyll reflectance index (r = 0.472). Although there was a significant correlation between nitrogen and chlorophyll content, none of the indices studied here correlated with nitrogen content. The influence of various environmental factors (altitude, slope, vegetation density and aspect) on leaf composition (nitrogen, carbon chlorophyll content and chlorophyll a/b ratio) and on the vegetation indices was studied. Environmental factors had an influence on both leaf composition and vegetation indices. Chlorophyll and nitrogen content were influenced mostly by the altitude and slope of the site while vegetation indices were affected mostly by its orientation.

scholarly journals The Impact of Long-and Short-Term Strontium Treatment on Metabolites and Minerals in Glycine max

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3825 ◽  
Author(s):  
Hanaka ◽  
Dresler ◽  
Wójciak-Kosior ◽  
Strzemski ◽  
Kováčik ◽  
...  
Keyword(s):  
Glycine Max ◽  
Chlorophyll Content ◽  
Entire Period ◽  
Short Term ◽  
Short Term Exposure ◽  
Applied Dose ◽  
The Impact

The impact of long-term exposure to Sr2+ (LTE, four doses, 43.5 mg Sr2+ per pot, with a total of 174 mg Sr2+ per pot during the entire period of cultivation) and short-term exposure to Sr2+ (STE, one dose, 870 mg Sr2+ per pot four days before harvest) on the content of phytoestrogens and allantoin in soybeans were compared. Sr2+ accumulation, the effect on the concentration of macroelements, and basic physiology were also analyzed. LTE reduced the content of malonyldaidzin and malonylgenistin in the roots (58% and 50% compared to the control, respectively). STE increased the amount of all isoflavones in the stem and genistein in the leaves and decreased the content of malonyldaidzin and malonylgenistin in the leaves (55% and 48% compared to the control, respectively) and roots (69% and 62% of the control, respectively) as well as genistein and coumestrol in the roots (both 50% compared to the control). Sr2+ presence stimulated the accumulation of allantoin in the roots (three-fold higher than in the control), but only STE had similar effects on the shoots. In contrast to LTE, Sr2+ was transported extensively from the roots to the leaves under STE. In comparison to the control, LTE resulted in an increase in the Ca content in the stem by 36%, whereas Ca2+ accumulation in the leaves, stems, and roots increased by 60%, 80%, and 36%, respectively, under STE. Additionally, a significant accumulation of K was found only in the roots of the LTE group. The chlorophyll content did not differ between the treatments. Overall, the production of phytoestrogens and Sr accumulation were affected by both the applied dose and the duration of exposure to Sr.

A modified linear extrapolation approach towards red edge position detection and stress monitoring of wheat crop using hyperspectral data

2014 ◽  
Vol 35 (4) ◽  
pp. 1432-1449 ◽  
Author(s):  
Prabir Kumar Das ◽  
Karun Kumar Choudhary ◽  
B. Laxman ◽  
S.V.C. Kameswara Rao ◽  
M.V.R. Seshasai
Keyword(s):  
Hyperspectral Data ◽  
Wheat Crop ◽  
Linear Extrapolation ◽  
Stress Monitoring ◽  
Position Detection ◽  
Red Edge ◽  
Red Edge Position

scholarly journals Estimation of Chlorophyll Content in Potato Leaves Based on Spectral Red Edge Position

2018 ◽  
Vol 51 (17) ◽  
pp. 602-606 ◽  
Author(s):  
Tao Zheng ◽  
Ning Liu ◽  
Li Wu ◽  
Minzan Li ◽  
Hong Sun ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Red Edge ◽  
Red Edge Position

scholarly journals Estimativas do Teor de Clorofila do Mangue da Baía de Vitória (ES) por meio de Dados Hiperespectrais

2020 ◽  
Vol 13 (1) ◽  
pp. 131
Author(s):  
Elizabeth Dell Orto e Silva ◽  
Monica Maria Pereira Tognella ◽  
Alexandre Candido Xavier ◽  
Gabriela Carvalho Zamprogno ◽  
Savia Soares Pascoalini
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Spectral Index ◽  
Spectral Response ◽  
Field Measurements ◽  
Hyperspectral Data ◽  
Net Radiation ◽  
Mangrove Species ◽  
Spectral Bands ◽  
Red Edge

O teor de clorofila pode indicar a saúde geral da vegetação, e alterações no conteúdo do pigmento da folha podem ter uma relação direta com mudanças na resposta espectral da folha. O objetivo deste estudo é estimar o conteúdo de clorofila do manguezal da Baía de Vitória (ES) por meio de dados hiperespectrais. Foi analisado o comportamento espectral de duas espécies de mangue; R. mangle e L. racemosa utilizando um espectrorradiômetro, e realizadas medidas em campo dos índices de clorofila a, b e total a partir de um medidor eletrônico ClorofiLOG CFL-1030 (Falker). Os índices de clorofila das duas espécies de mangue foram correlacionados com os índices espectrais obtidos por meio de álgebra de bandas (λ1 + λ2 / λ1 - λ2), com a máxima reflectância da borda do vermelho (red edge) e bandas espectrais estreitas (350 nm a 2500 nm). Os índices criados a partir das bandas (391nm e 396nm) e (736nm e 821nm) apresentaram os maiores coeficientes de determinação quando correlacionados à clorofila a (r² 0,72) e clorofila b (r² 0,77) para a espécie L. racemosa. Para a espécie R. mangle, não foi possível identificar uma banda estreita ou um índice espectral que apresentasse alta correlação com os índices de clorofila a, b ou total. Os resultados apontam para a necessidade de caracterizar mais detalhadamente as condições ambientais, e também as condições biofísicas do bosque de mangue para obtenção de modelos de regressão precisos e específicos para cada espécie em particular. Estimates of Vitoria Bay Mangrove (ES) Chlorophyll Content by Hyperspectral Data A B S T R A C TThe chlorophyll content may indicate the general health of the vegetation, and alterations in the content of the leaf pigment may have a direct relation with changes in the spectral response of the leaf. The objective of this study is to estimate the chlorophyll content of the Vitória Bay mangrove (ES)  by means hyperspectral data. The spectral behavior of two mangrove species was analyzed; R. mangle and L. racemosa using a spectroradiometer, and field measurements of chlorophyll indices were performed with a ClorofiLOG CFL-1030 (Falker) electronic meter. The chlorophyll indices of the two mangrove species were correlated with the spectral indices obtained by means of band algebra (λ1 + λ2 / λ1 - λ2), and with the maximum red edge reflectance and narrow spectral bands ( 350 nm at 2500 nm). The indices created from the bands (391nm and 396nm) and (736nm and 821nm) presented the highest coefficients of determination when correlated to chlorophyll a (r ² 0.72) and chlorophyll b (r ² 0.77) for L. racemosa . For the R. mangle species, it was not possible to identify a narrow band or a spectral index that showed high correlation with the indexes of chlorophyll a, b or total. The results point to the need to characterize in more detail the environmental conditions, as well as the biophysical conditions of the mangrove forest to obtain accurate and specific regression models for each speciesKeywords: radiation, net radiation, photosynthetically active radiation, Caatinga, dry.Key words: Chlorophyll a, b and total, hyperspectral analysis, red edge, spectral index.

Effect of Elevated CO2 Concentration on Leaf Photosynthesis in Sanjiang-Deyeuxia angustifolia

2013 ◽  
Vol 726-731 ◽  
pp. 305-309
Author(s):  
Ming Yi Xu ◽  
Ao Xue Wang ◽  
Hong Wei Ni
Keyword(s):  
Stomatal Conductance ◽  
Chlorophyll Content ◽  
Photosynthetic Parameters ◽  
Leaf Photosynthesis ◽  
Short Term ◽  
Deyeuxia Angustifolia ◽  
Different Levels ◽  
Concentration Condition ◽  
Photosynthetic Ability

Deyeuxia angustifolia were grown under three different levels of CO2concentration conditions, 370μmol mol-1(ambient CO2), 550μmol mol-1(elevated CO2) and 700μmol mol-1(elevated CO2) respectively. We investigated the responses of photosynthesis and growth ofD.angustifoliaunder different CO2concentration conditions. Leaf photosynthesis and chlorophyll content were checked. The results showed that the values of net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2concentration (Ci), transpiration (E), chlorophyll content were influenced by the elevated CO2concentrations. The photosynthetic parameters changed in parallel with CO2enrichment. CO2enrichment in short term improved the photosynthetic ability of leaves, whereas the capacity was weakened under long-term elevated CO2concentration condition. The leaves ofD.angustifoliagrown under elevated CO2concentrations at the end of growth, had lower Pn, Gs, Ci, E and chlorophyll content than those grown and measuered under ambient CO2concentration. The results indicated thatD.angustifoliaappeared photosynthetic acclimation.

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