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22 results for “chlorophyll content”
Seagrass morphometry and chlorophyll content at nine stations along a eutrophication gradient in West Falmouth Harbor, 2019
West Falmouth Harbor (West Falmouth, MA, USA) has been experiencing a dramatic increase in nitrogen loading from an upgradient municipal wastewater treatment facility since the early 2000’s. As part of a long-term study into the effects of this nitrogen enrichment, in 2019 we sampled seagrass (Zostera marina) to assess the relationship between sediment biogeochemistry and seagrass ecosystem parameters. This dataset contains information on aboveground and belowground biomass ratios, seagrass density, epiphyte biomass, and chlorophyll content from sites across the eelgrass bed in West Falmouth Harbor that receive varying inputs of nitrogen. The data supports findings reported in Haviland et al., 2022 (https://doi.org/10.1002/lno.12025).
Benthic chlorophyll, density, porosity, and organic content concentrations and gross oxygenic photosynthesis rates in surficial estuarine intertidal sediments at sites on Sapelo Island and near the Satilla River from January, April, June and July 2001
Seasonal patterns of estuarine creek-bank and intertidal marsh benthic chlorophyll, density, porosity, and organic content were investigated at several sites on Sapelo Island and the Satilla River in coastal Georgia. Benthic chlorophyll, density, porosity, and organic content were measured in the bulk surface centimeter depth of sediment. Several relatively pristine sites on Sapelo Island (Moses Hammock and Dean Creek) and a presumably heavily impacted site (Dover Bluff) show similar levels of chlorophyll concentration across bank and marsh zones with higher photosynthetic biomass in the spring season.
Benthic chlorophyll, density, porosity, and organic content concentrations in surficial estuarine intertidal sediments at sites on Sapelo Island and near the Satilla River from June and August 2002
Seasonal patterns of estuarine creek-bank and intertidal marsh benthic chlorophyll, density, porosity, and organic content were investigated at several sites on Sapelo Island and the Satilla River in coastal Georgia. Benthic chlorophyll, density, porosity, and organic content were measured in the bulk surface centimeter depth of sediment. Several relatively pristine sites on Sapelo Island (Moses Hammock and Dean Creek) and a presumably heavily impacted site (Dover Bluff) show similar levels of chlorophyll concentration across bank and marsh zones with higher photosynthetic biomass in the spring season.
Global leaf chlorophyll content (LCC) product from MODIS imagery (2000-2020)
<p>The spatial and temporal distribution of leaf chlorophyll content (LCC) is critical for understanding the capacity of vegetation photosynthesis. Here, a global 8-day leaf chlorophyll content (LCC) dataset at 500-m resolution was generated from MODIS data using a matrix system with two pairs of vegetation indices. </p> <p><strong>The following paper should be cited when using the data:</strong></p> <p>Xu, M., Liu, R., Chen, J.M., Liu, Y., Wolanin, A., Croft, H., He, L., Shang, R., Ju, W., Zhang, Y., He, Y., Wang, R., 2022. A 21-year time-series of global leaf chlorophyll content maps from MODIS imagery. IEEE Trans. Geosci. Remote Sens. <a href="https://doi.org/10.1109/TGRS.2022.3204185">https://doi.org/10.1109/TGRS.2022.3204185</a>.</p> <p>Detailed description of data organization can be found in the uploaded document "1Readme.docx".</p> <p>The whole dataset of MODIS LCC product is from 2000 to 2020. <strong>Due to the data volume limitation of Zenodo, currently the data from 2000-2010 can be downloaded through Google Drive sharing link:</strong></p> <p><a href="https://drive.google.com/drive/folders/11eXetjsAB_ZjFqGs8SXEWzd6byr_8LoW?usp=sharing">https://drive.google.com/drive/folders/11eXetjsAB_ZjFqGs8SXEWzd6byr_8LoW?usp=sharing</a></p> <p><strong>Related dataset: </strong>Mingzhu, X., Liu, R., Chen, J. M., Shang, R., & Liu, Y. (2022). Global leaf chlorophyll content product from MERIS imagery (GLOBMAP MERIS LCC) [Data set]. Zenodo. <a href="https://doi.org/10.5281/zenodo.10467919">https://doi.org/10.5281/zenodo.10467919</a></p> <p>For any other questions, please send email to Mingzhu Xu (<a href="mailto:xumzhu@gmail.com">xumzhu@gmail.com</a>).</p>
Figure 6 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 6. Distribution of microplankton HPI in the photic zone of the Crimean coastal waters and deep-water northern part of the Black Sea at April 2017.
Figure 4 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 4. Distribution of microplankton HPI in the photic zone of the Crimean coastal waters and deep-water northern part of the Black Sea at October 2016.
Figure 3 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 3. Distribution of microplankton HPI in the surface waters of the Crimean coastal waters and deep-water northern part of the Black Sea at October 2016.
Figure 1 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 1. Distribution of microplankton chlorophyll a and ATP concentrations in the Crimean coastal waters and deepwaternorthern part of the Black Sea at October 2016.
Gas exchange, dieback, leaf water potential and chlorophyll content during a greenhouse drought experiment: An evolutionary perspective on functional diversity in co-occuring willow(salix) species
Thirteen willow (Salix) species occur in southeastern Minnesota and often co-occur within the same wetlands. This high local diversity is challenging to explain since closely related species are often functionally similar and density-dependent interactions such as competition and susceptibility to pests and pathogens should limit their co-occurrence. However, if willow species are partitioning resources, or if they are phylogenetically structured so that closely related species rarely co-occur, then the impact of these density-dependent processes could be reduced. In this study, I examined the role of niche partitioning in maintaining local willow diversity by comparing species physiology in a greenhouse.
Global leaf chlorophyll content product from MERIS imagery (GLOBMAP MERIS LCC)
<p>Leaf chlorophyll content (LCC) is an indicator of plant physiological function and is an important parameter in estimating the carbon and water fluxes of terrestrial ecosystems. Here, we produced a new global 7-day LCC product (GLOBMAP MERIS LCC) at 300-m resolution from 2003.01 to 2012.03 using a neural network model based on radiative transfer model simulations from CCI MERIS surface reflectance data. It shows an improvement over the previous MERIS LCC product in capturing LCC seasonal variations in different plant functional types.</p> <p><strong>The following paper should be cited when using the data:</strong><br>Xu, M., Liu, R., Chen, J.M., Shang, R., Liu, Y., Qi, L., Croft, H., Ju, W., Zhang, Y., He, Y., Qiu, F., Li, J., Lin, Q., 2022. Retrieving global leaf chlorophyll content from MERIS data using a neural network method. Isprs J. Photogramm. Remote Sens. 192, 66–82. <a href="https://doi.org/10.1016/j.isprsjprs.2022.08.003">https://doi.org/10.1016/j.isprsjprs.2022.08.003</a>.</p> <p><strong>Due to the data volume limitation of Zenodo, the data we uploaded here are an example tile (h59v10) at 300-m resolution and a global 0.05° composition of multi-year average LCC with a 7-day interval</strong><strong>. The original dataset of GLOBMAP MERIS LCC product can be downloaded through Google Drive sharing link:</strong></p> <p><a href="https://drive.google.com/drive/folders/1HNlBI2hHeUAW-o7HCgLOxbUEh1ak4AX2?usp=sharing">https://drive.google.com/drive/folders/1HNlBI2hHeUAW-o7HCgLOxbUEh1ak4AX2?usp=sharing</a></p> <p><strong>Data format description:<br></strong>Data type: int16<br>Projection: GCS_WGS_1984<br>Scaling factor: 0.1<br>Unit: ug/cm2</p> <p><strong>Related dataset: </strong>Mingzhu Xu, Ronggao Liu, Jing M. Chen, Yang Liu, & Rong Shang. (2021). Global leaf chlorophyll content (LCC) product from MODIS imagery (2000-2020) (Version V1) [Data set]. Zenodo. <a href="https://doi.org/10.5281/zenodo.5805575">https://doi.org/10.5281/zenodo.5805575</a></p> <p>For any other questions, please send email to Mingzhu Xu (<a href="mailto:xumzhu@gmail.com">xumzhu@gmail.com</a>).</p>
Sediment chlorophyll-a, pheophytin, biogenic silica, and carbohydrate content (EPS) from the Rowley River mudflat in September 2012, Rowley, MA
Tidal flats are critical components of coastal estuarine ecosystems characterized by high rates of benthic primary productivity and biogeochemical cycling. In order to investigate the impact of anthropogenic nutrient loading on tidal flat biogeochemistry we carried out a two-week fertilization experiment. Throughout the course of the study we conducted two light-dark, whole-core incubations and took measurements of three indicators of microphytobenthos activity in addition to quantifying the resident eastern mud snail (Ilyanassa obsoleta) population.
Maximum carboxylation rate estimation with chlorophyll content as a proxy of rubisco content
<p>The maximum carboxylation rate (Vcmax) is a key parameter in determining the plant photosynthesis rate per unit leaf area. However, most terrestrial biosphere models currently treat Vcmax as constants changing only with plant functional types, leading to large uncertainties in modelled carbon fluxes. Vcmax is tightly linked with <span>Ribulose-1,5-bisphosphate carboxylase/oxygenase (</span>Rubisco). Here we investigated the relationship between leaf chlorophyll content and Rubisco (Chl-Rub) within a winter wheat paddock. With chlorophyll as a proxy of Rubisco, a semi-mechanistic model was developed to model Vcmax<sub>25.</sub> The Chl-Rub relationship was validated using measurements in a temperate forest in Canada. The results showed that Rubisco was strongly correlated with chlorophyll (R<sup>2</sup> = 0.96, p < 0.001) for winter wheat, due to the absorption of light energy by chlorophyll and the amount of CO<sub>2</sub> catalysed by Rubisco are tightly coupled<span>.</span> Incorporating the Chl-Rub relationship into the semi-mechanistic model, the root mean square error of modelled Vcmax<sub>25</sub> was the lowest among all estimation models. The slopes of Chl-Rub relations were almost identical for the winter wheat and temperate forest, demonstrating the potential for using leaf chlorophyll content as a proxy of leaf Rubisco in modelled Vcmax<sub>25</sub> at large spatial scales. We anticipate that improving Vcmax<sub>25</sub> estimates over time and space will reduce uncertainties in terrestrial biosphere models and improve the estimates of global carbon budgets.</p>
Maximum carboxylation rate estimation with chlorophyll content as a proxy of rubisco content
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Chlorophyll fluorescence, moisture and chloride content for Morella cerifera on Hog Island, VA, 2007
Water content and fluorescence were measured for Morella cerifera shrubs on Hog Island, VA in 2007.
Data from: Vis/NIR reflectance spectroscopy for hybrid rice variety identification and chlorophyll content evaluation for different nitrogen fertilizer levels
Nitrogen is one of the most important nutrient indicator for the growth of crops, which is closely related to chlorophyll content of leaves and thus influences the photosynthetic ability of crops. In this study, visible and near infrared (vis/NIR) reflectance spectroscopy combined with multi-variate analysis was used to identify hybrid rice varieties and nitrogen fertilizer levels, as well as to detect chlorophyll content associated with nitrogen levels. The support vector machine (SVM) algorithm was applied to identify five varieties of hybrid rice and six levels of nitrogen fertilizer. The results demonstrated that different varieties of hybrid rice for each nitrogen level can be well distinguished except for the highest nitrogen level, and no nitrogen level for each rice variety can be completely identified from the other five nitrogen levels. Further, several spectral indices combined with partial least squares (PLS) analysis were applied for estimating chlorophyll content of rice leaves from plants subject to different nitrogen levels, and a coefficient of determination (R2) of 97.8% and a ratio of performance to deviation (RPD) of 4.6 for all rice varieties indicated this as a preferable procedure. Experimental results demonstrated that vis/NIR spectroscopy can have a great potential for identification of rice varieties and evaluation of nitrogen fertilizer levels.
Data from: Changes in the chlorophyll content of grape leaves could provide a physiological index for responses and adaptation to UV-C radiation
Stilbenes are a group of phytoalexins that play an important role in grapevine (Vitis) basal immunity and can be induced by biotic and abiotic stresses. The levels of chlorophylls, the main pigments in plant cells, can also indicate the tolerance of plants to various stresses. Here, the response of different grapevine genotypes to UV-C radiation treatment was tested and the abundance of chlorophyll in the Hoe29 and Ke53 genotypes was observed to increase significantly within 6 h of UV-C treatment. Conversely, chlorophyll levels decreased markedly in the Augster Weiss and Müller-Thurgau genotypes. Furthermore, stilbene abundance increased substantially in the Hoe29, Ke53, Ke83 and Pinot Blanc genotypes, but increased only slightly in Augster Weiss and Müller-Thurgau. The expression of RESVERATROL SYNTHASE, which encodes a key enzyme in the stilbene synthesis pathway, increased in Hoe29, Ke53, Ke83 and Pinot Blanc following UV-C treatment, in a manner consistent with stilbene accumulation. In addition, we observed that reactive oxygen species (ROS) provide a key trigger in physiological responses and changes in secondary metabolite contents. In summary, the results from this study support a link between ROS, chlorophyll levels and genetic diversity for stilbene abundance in different grape genotypes, providing insights into mechanisms for plant physiological and biochemical responses and adaptations to stress.
Figure 5 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 5. Distribution of microplankton HPI in the surface waters of the Crimean coastal waters and deep-water northern part of the Black Sea at April 2017.
Figure 2 in Comparison of microplankton heterotrophic-photoautotrophic balance based on the content of ATP and chlorophyll a in the plankton of the northern area of the Black Sea during the autumn and spring seasons
Figure 2. Distribution of microplankton chlorophyll a and ATP concentrations in the Crimean coastal waters and deepwater northern part of the Black Sea at April 2017.
Data from: Vis/NIR reflectance spectroscopy for hybrid rice variety identification and chlorophyll content evaluation for different nitrogen fertilizer levels
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Data from: Changes in the chlorophyll content of grape leaves could provide a physiological index for responses and adaptation to UV-C radiation
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