Relationship of intertidal surface sediment chlorophyll concentration to hyperspectral reflectance and chlorophyll fluorescence

2006 ◽  
Vol 29 (2) ◽  
pp. 183-196 ◽  
Author(s):  
Jacco C. Kromkamp ◽  
Edward P. Morris ◽  
Rodney M. Forster ◽  
Claire Honeywill ◽  
Scott Hagerthey ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Surface Sediment ◽  
Chlorophyll Concentration ◽  
Hyperspectral Reflectance ◽  
Relationship Of ◽  
Intertidal Surface

scholarly journals CHLOROPHYLL CONTENT AND ITS RELATION TO PRODUCTIVITY OF CROPS AND WEEDS IN A TROPICAL AGROECOSYSTEM AT GUJAR LAKE MARGIN, INDIA

2016 ◽  
Vol 23 ◽  
pp. 39-44
Author(s):  
Mayank Singh ◽  
Mahendra Pratap Singh
Keyword(s):  
Net Primary Productivity ◽  
Cynodon Dactylon ◽  
Chlorophyll Concentration ◽  
Increasing Trend ◽  
Winter Crop ◽  
Total Crop ◽  
In The Beginning ◽  
Relationship Of ◽  
Tropical Agroecosystem ◽  
Lake Margin

The paper deals with evaluation of magnitude of changes in chlorophyll concentration, chlorophyll density and relationship of chlorophyll density with net primary productivity of mixed winter crop (wheat and mustard) community at Gujar lake margin in the district Jaunpur (U.P.). The chlorophyll concentration of each component of crops, dominant weed Cynodon dactylon (Linn.) Pers. and ‘other weeds’ have shown increasing trend in the beginning and reached their peak values at the same time (75-90 days). Thereafter, chlorophyll concentration have declined sharply. Maximum chlorophyll density value of total crop (wheat and mustard) was 2015.77 mg m-2 and for total weeds was 810.08 mg m-2, both at the age of 90 days of crop. There was a significant positive correlation between productivity and chlorophyll density of total crop (r = 0.903, p = 0.002) and total weeds (r = 0.580, p = 0.131).ECOPRINT 23: 39-44, 2016

scholarly journals Impact of Exposure to Low Temperature Degrees in Field Conditions on Leaf Pigments and Chlorophyll Fluorescence in Leaves of Mango Trees

2020 ◽  
Vol 10 ◽  
pp. 30-45
Author(s):  
Ali A.S. Sayed ◽  
Farouk M. Gadallah ◽  
Mohamed A. Seif El-Yazal ◽  
Gamal A. Abdel-Samad
Keyword(s):  
Chlorophyll Fluorescence ◽  
Low Temperature ◽  
Chlorophyll Concentration ◽  
Ambient Air ◽  
Sampling Time ◽  
Chlorophyll B ◽  
Physiological And Biochemical ◽  
Sampling Times ◽  
Fayoum Governorate

This experiment was conducted to found the connection between low temperature stress in vivo conditions (ambient-air temperature) and the changes in some physiological and biochemical events (leaf pigments and chlorophyll fluorescence) of mango trees in response to exposure to natural low temperature (cold). To verify this objective, 12 popular commonly mango cultivars (25 years old) which grown in private orchard in Fayoum Governorate, Egypt were selected for this study which carried out during the period from November to March of years; 2012 and 2013. The selected cultivars were: Alphonso, Baladi, Bullock's Heart, Helmand, Hindi Besennara, Mabrouka, Mestekawy, Nabeeh, Oweisi, Spates, Taimour and Zebda. Based on the obtained results, it can be stated that, chlorophyll (a) concentration in the leaves was significantly differed among the cultivars throughout the whole sampling times, in this respect, Helmand one gave the highest one while, and the highest one by sampling times was November one. The concentration of chlorophyll (b) was significant as effected by the effect of cultivars and sampling time recorded the highest value by the cultivar of Spates and December sample, respectively. Total chlorophyll concentration in the leaves reached its peak by the cultivar of Nabeeh and sampling time of December as compared to others. The both of Ewais cultivar and the sample of March showed the highest values of carotenoids concentration in the leaves. The levels of anthocyanin in leaves were significantly differed as affected by the cultivars and sampling times, indicating that the cultivar of Helmand and November sample recorded the highest values of anthocyanin in leaves. The greatest reductions in Fv/Fmratio were recorded at month of November and indicated that the reductions were in the order of Alphonso˃ Mabrouka˃Taimour˃ others. The effect of sampling time, cultivars and their interaction on Fv/Fm were significant, but small between some values of Fv/Fm.

scholarly journals The Impacts of Growth and Environmental Parameters on Solar-Induced Chlorophyll Fluorescence at Seasonal and Diurnal Scales

2019 ◽  
Vol 11 (17) ◽  
pp. 2002
Author(s):  
Leizhen Liu ◽  
Wenhui Zhao ◽  
Jianjun Wu ◽  
Shasha Liu ◽  
Yanguo Teng ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Growth Parameters ◽  
Pearson Correlation ◽  
Canopy Structure ◽  
Principal Component ◽  
Environmental Parameters ◽  
Area Index ◽  
Relationship Of ◽  
The Impact

Solar-induced chlorophyll fluorescence (SIF) is considered to be a potential indicator of photosynthesis. However, the impact of growth and environmental parameters on SIF at different time-scales remains unclear, which has greatly restricted the application of SIF in detecting photosynthesis variations. Thus, in this study, the impact of growth and environmental parameters on SIF was thoroughly clarified. Here, continuous time series of canopy SIF (760 nm, F760) over wheat and maize was measured based on an automated spectroscopy system. Meanwhile, field measurements of growth and environmental parameters were also collected using commercial-grade devices. Relationships of these parameters with F760, apparent SIF (F760/solar radiance, AF760), and SIF yield (F760/canopy radiance of 685 nm, Fy760) were analyzed using principal component analysis (PCA) and Pearson correlation to reveal their impacts on SIF. Results showed that F760 at seasonal and diurnal scales were mainly driven by solar radiation (SWR), leaf area index (LAI), chlorophyll content (Chl), mean leaf inclination angle (MTA), and relative water content (RWC). Other environmental parameters, including air temperature (Ta), relative humidity (Rh), vapor pressure deficit (VPD), and soil moisture (SM), contribute less to the variation of seasonal or diurnal F760. AF760 and Fy760 are likely to be less dependent on Ta, Rh, and VPD due to the removal of the impact from SWR, but an enhanced relationship of AF760 (and Fy760) with SM was observed, particularly under water stress. Compared with F760, wheat AF760 was better correlated to LAI and RWC as expected, while maize AF760 did not show an enhanced relationship with all growth parameters, probably due to its complicated canopy structure. The relationship of wheat Fy760 with canopy structure parameters was further reduced, except for maize measurements. Furthermore, SM-induced water stress and phenological stages should be taken into consideration when we interpret the seasonal and diurnal patterns of SIF since they were closely related to photosynthesis and plant growth (e.g., LAI in our study). To our knowledge, this is the first exploration of the impacts of growth and environmental parameters on SIF based on continuous ground measurements, not only at a seasonal scale but also at a diurnal scale. Our results could provide deep insight into the variation of SIF signals and also promote the further application of SIF in the health assessments of terrestrial ecosystems.

Detecting Suaeda salsa L. chlorophyll fluorescence response to salinity stress by using hyperspectral reflectance

2011 ◽  
Vol 34 (2) ◽  
pp. 581-588 ◽  
Author(s):  
Hao Zhang ◽  
Hao Hu ◽  
Xiaobin Zhang ◽  
Kelin Wang ◽  
Tongqing Song ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Salinity Stress ◽  
Suaeda Salsa ◽  
Hyperspectral Reflectance ◽  
Fluorescence Response

Disentangling the Control of Canopy Structure and Plant Physiology on the Diurnal Dynamics of SIF and Photosynthesis

2020 ◽  
Author(s):  
Christine Chang ◽  
Jiaming Wen ◽  
Ruiqing Zhou ◽  
Ying Sun
Keyword(s):  
Plant Physiology ◽  
Chlorophyll Fluorescence ◽  
Regional Scale ◽  
Canopy Structure ◽  
Hyperspectral Reflectance ◽  
Diurnal Dynamics ◽  
Promising Tool ◽  
Leaf Level ◽  
Biological Context

<p>Solar-induced chlorophyll fluorescence (SIF) offers a promising tool to remotely monitor photosynthesis from the canopy to regional scale. However, in order to interpret instantaneous satellite SIF measurements in a biological context, there needs to be a better understanding of the diurnal dynamics of SIF and photosynthesis. Using two maize sites with contrasting row orientations, we acquired canopy scale SIF and hyperspectral reflectance using a tower and UAV, in conjunction with concurrent leaf-level measurements of photosynthesis and chlorophyll fluorescence. We show that SIF dynamics are impacted by a combination of canopy structure and plant physiology, which can lead to a divergent SIF-photosynthesis relationship, particularly at certain times of day. These findings have significant implications for upscaling and interpreting satellite SIF retrievals, which rely on daily mean integrals.</p>

Relationship of Sediment Redox Conditions to Methyl Mercury in Surface Sediment of Louisiana Lakes

2004 ◽  
Vol 39 (8) ◽  
pp. 1925-1933 ◽  
Author(s):  
R. D. DeLaune ◽  
A. Jugsujinda ◽  
I. Devai ◽  
W. H. Patrick
Keyword(s):  
Surface Sediment ◽  
Methyl Mercury ◽  
Redox Conditions ◽  
Relationship Of

Total Metals in Intertidal Surface Sediment of Oyster Culture Areas in Sonora, Mexico

2003 ◽  
Vol 70 (6) ◽  
pp. 1235-1241 ◽  
Author(s):  
L. Garc�a-Rico ◽  
S. Wilson-Cruz ◽  
M. C. Frasquillo-F�lix ◽  
M. E. Jara-Marini
Keyword(s):  
Surface Sediment ◽  
Oyster Culture ◽  
Intertidal Surface
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