Questions related to Vegetation Ecology
I participate in an international research project focusing on the relationship of happiness feelings to environmental conditions. Our hypothesis is that happiness may be valued more in regions with favorable environmental conditions. Among other variables we would like to examine the length of the vegetation period in several world regions. Therefore we are looking for data on the different vegetation period arount the globe that can be processed numerically (all our other variables are processed in SPSS). I found some databases but they are either local or employ a formats that are not accessible to most psychologists. I would appreciate any suggestions about how to find global vegetation data.
Hi, I want to realize a project of monitoring of Forest Health status on a large scale in Europe. But I don't are sure of the index that can be better to use for this task. maybe the NDVI is one of the most popular, but I have read something about the NDWI and EVI. What do you think about the better index to assess the health status or the decline of the vegetation canopy of the European forest?
Help me, thank you very much
If I have a camera capable of taking raw images and a spectralon 99% reflectance panel, can I calculate accurate reflectance readings or NDVI values from small vegetation plots without a spectrometer if the reflectance panel is in every image? I would like to take reflectance readings from small vegetation plots and correlate them to biomass estimates.
I am looking for values of Urbanity and Hemeroby indexies for the below listed plants. I have borrowed the BiolFlor book with CD-database (Klotz & Kühn 2002) from the library but still don't have an access to the database on it (limited only to the CD owner).
Do you know any sources (publications, on-line databases) of the above indexies which is available for free?
1. Cucubalus baccifer:
2. Erigeron annuus:
3. Lamium galeobdolo:
4. Myosotis palustris:
5. Plantago major:
6. Polygonum lapathifolium: (or Persicaria lapathifolia).
7. Ranunculus auricomus:
8. Rosa canina:
9. Taraxacum officinale:
Thank you in advance for any help.
P.S. Please share this quaestion with your botanist-colleques.
Bruce M. Boghosian in the November 2019 issue of Scientific American (p. 73) writes about wealth distribution. Using math and physics, it seems that a slight perturbation to a symmetric or isotropic starting point can result in inequality. Slight inequality results in increasing inequality (anisotropy) over time. These issues are also canvassed in the Growth of Oligarchy in a Yard-Sale Model of Asset Exchange by Bruce M. Boghosian, Adrian Devitt-Lee, and Hongyan Wang, arxiv 2016 and in The Affine Wealth Model by Jie Li, Bruce M. Boghosian, and Chengli Lion, arxiv 2018.
Ehud Meron in Physics Today November 2019 issue writes about Vegetation Pattern Formation (p. 31). While water distribution for a given topography may initially be isotropic, vegetation can distribute in anisotropic patterns.
Are these two instances of initial isotropic distribution leading to anisotropic patterns connected by the same physics? If so, what is the physics?
I wanted to know if the data of plant survey in an 0.1ha of area can represent the vegetation of the whole forest area in general? Any
During the last years many electronic databases of vegetation plots, mainly phytosociological relevés, were established in different European countries. These databases contain information which is extremely valuable for both testing various macroecological hypotheses and for nature conservation surveying or monitoring.
Somebody can help me to find vegetation-plot databases of relevés based in the phytosociological method made in Portugal?
Thanks in advance.
Simpson's Diversity index has two forms, one equation for finite populations and one for infinite populations. Which version should I use if working with vegetation % cover values from quadrats? A brief survey of published papers shows both equations used with such data suggesting that either there is no meaningful difference or that authors have not considered the options.
I am beginning to investigate assessment of vegetation using Ellenberg classification in marsh habitats. And in studies of marsh vegetation I have a problem when species list of a study plot is too short (1-3 species). And I would like to ask you, does this sample suitable for calculation of mean Ellenberg indicator value of a habitat? Maybe, are there any publications pointed out this issue?
Best wishes, Anatoliy A. Khapugin
World's urban tales had been told many years ago that polar bears are wandering through Polish country. It was never true in historical times, however Alfred Jahn has written in his "Ice and glaciations" (PWN 1971): "In Poland, snow begins to fall mostly in December, and in January and February already covers the earth with a thin layer. This happens when the air temperature drops below 0deg, when the water freezes and the earth is covered with a hard, soggy clod. The change takes place in March. Just a few days of thaw ..." This winter we have here up to 9degC and a thin layer of snow was with breaks for... four weeks no more. In late December I've found the willow flowers at the walk. Daisies bloomed on the lawns. It's a rule now. However, it is not question in plant biology. We start to enjoy with a mediterrenian climate, now. And the mediterrenians? Now it is hard to stay there in the summer time. We also are the most calm country in the Europe with longest white-and-yellow sandy sunny beaches at the seaside. Will Poland be the best place to live for next few centuries?
This winter season the first thin layer of snow occurred here on 5th January 2020.
Dear colleagues, which indices for measuring species diversity you think are the best ? I used Shannon–Wiener diversity index , but reviewer thinks it is not the appropriate method. Can somebody tell my why, please? Do you use Shannon–Wiener diversity index? Could you give me some references where this index is used? Is Simpson' s diversity index better? If so, then why? Or just simple species richness?
In a particular (natural) environment biological diversity can quantified, For example, a 4 X 4 meter square area in a carrot patch has 300 carrot plants, all the same species. It has a very low biodiversity index of 1/300, or 0.003.
A 4 X 4 meter square area in the forest has 1 pine tree, 1 fern, 1 conifer tree, 1 moss, and 1 lichen, for a total of 5 different species and 5 individuals. The biodiversity index here is high, 5/5 = 1.
Is the shanon wineer index relevant for enviromental recondition like garden and city park ?
If there are statistical tool that can answer my query, that would be awesome. Thanks..
Last time, I have found a population of plant at 6m and 1700m altitude. Morphologicaly, there is a visible difference. Can you suggest me other parameters?!
is plant habit one of the factors determining photosynthesis light response? can we say trees generally have curve with bigger slope compared to herbs?
This in order to make an accurate comparison in Biogeography for a genus.
Dear researcher, professor, practician, Hydrologist
my name is Ali, I am a student of Gifu university. my research is comparison two small catchment with different vegetation types in central Japan. one part of my research is water quality.
I was measure water quality from broadleaf deciduous and evergreen coniferous forest. and one of my parameters in dissolved oxygen (DO).
based on my data, DO in coniferous evergreen is always lower than in broadleaf deciduous. who knows the reason?
I try to connect with baseflow data because baseflow in coniferous evergreen is lower than broadleaf deciduous. but some literature said groundwater have low DO.
based on my data, DO in coniferous evergreen is always lower than in broadleaf deciduous. who knows the reason?
Thank you very much for your help
I need to design a sampling method to quantify the regeneration of the selected species at different altitudes/canopy closures in a national park. The park is about 9000 ha and ranges in altitude from sea level to about 600 m (tropical rain-forest conditions).
I am dealing with 6 tree species, 3 of which are relatively rear and found only at the peaks. I was thinking about going along with transects and using these to determine DBH (diameter at breast height) size class distribution of the species, but I was informed this may not be the best approach. Any Suggestions?
Are these exotics are one of the reasons for the depletion of ground water table in nilgiris
Despite Germany is probably the one country in the world where the largest number of vegetation plots (phytosociological relevés) have been sampled, their mobilisation in large vegetation-plot databases is lagging far behind other European countries. This relatively poor electronic data coverage from Germany impedes European studies, e.g. on diversity patterns and their drivers, niches of plant species and assembly rules of plant communities as well as broad-scale consisten vegetation classification, which otherwise are now well possible through the 1.3 million plots stored in the European Vegetation Archive (EVA).
GrassVeg.DE is a new collaborative vegetation-plot database organised by German members of the Eurasian Dry Grassland Group (EDGG) and has just joined the EVA consortium. GrassVeg.DE aims at making grassland relevés from Germany available for fundamental and applied research, both within Germany and internationally, while ensuring that data providers get proper credit and benefit. We collect relevés of grasslands and herblands in the widest sense, i.e. everything except forest, shrubland, segetal and aquatic communities. Phytosociologically, the scope mainly refers to the classes Festuco-Brometea, Koelerio-Corynephoretea (including Sedo-Scleranthetea), Violetea calaminariae, Molinio-Arrhenatheretea, Juncetea maritimi (including Saginetea maritimae), Juncetea trifidi, Elyno-Seslerietea, Carici-Kobresietea, Calluno-Ulicetea (including Nardetea strictae), Loiseleurio-Vaccinetea, Salicetea herbaceae, Trifolio-Geranietea (including Melampyro-Holcetea), Artemisietea vulgaris (incl. Galio-Urticetea) and Mulgedio-Aconitetea from the territory of Germany. Plot observations from other vegetation classes can be included as well if they form a minor part of a certain contribution.
Contributing data to GrassVeg.DE (and thus to the European and global megadatabases "EVA" and "sPlot"), ensures that your valuable plot data are permanently safeguarded for science, that you will get invitations for co-authorship and citations, while at the same time you become entitled to propose own research projects using the whole GrassVeg.DE and EVA database (and in the future also the sPlot database). That way you can get more out of your data, whether published or unpublished.
The rights and obligations of data contributors and data users of GrassVeg.DE are regulated by Bylaws that ensure a fair balance between both groups. Anyway, data use is restricted to data contributors. GrassVeg.DE is governed by a Custodian and a Deputy Custodian and a Governing Board, elected by the Consortium members (those who contributed the data). You find more information about GrassVeg.DE at our homepage: http://www.bayceer.uni-bayreuth.de/ecoinformatics/en/forschung/gru/html.php?id_obj=139259
If you are interested to join with your data, please contact me (firstname.lastname@example.org),
Best approach for statistical analysis of intercropped maize+cowpea experiment. Please take a example of any growth parameter such as plant height, number of leaves, LAI, CGR etc. and compare the both ANOVA tables. Thank u.
It is assumed that the grassland patches in the sub-tropical region of Nepal are homogeneous dominated by few major grass species. What should be the sample size and number of sampling units in a particular location (grassland patch)? Some literature have highlighted Relevee method and some have mentioned Tansley method. But how to fix the number of sampling units (or number of sample points/plots)?.
I am thinking about a remote sensing project, where I could use the vegetation data, especially grassland data, as ground truth. For that I would need the spatial location of the vegetation assassment. I searched a bit, but only found the Countryside survey, where the coordinates of the plots apparently are not easily available. I would be greatful if someone could help me with some links where I could find this kind of data. Thanks in advance,
I would like to work on the effect of salinity on leaf area, but there, I work on legumes wich leaf is composed of some leaflets, then my question, should I measure the surface of all the leaflets one by one, or another way exists to estimate this parameter?
Thank you for your contribution
I am interested in knowing some experience in research about the impacts suffered by the biological soil crust by activities such as trekking, 4x4 or mountain bikes travels, or in any case mechanical damage induced by human activities.
We are preparing a project that intends to study how the climate change affects the distribution of Arbutus unedo, but the literature that we found about environmental factors affecting the species distribution is somehow vague. Most of the literature have general indications about the species ecology.
Thanks in advance
Dear all, once I accidentally came across a map (a gradient map in green color) showing the intensity of vegetation ecology studies / or may be it was showing availability of vegetation survey data throughout the world. Now I need this map to show the regions of vegetation data gaps across the globe, but unfortunately I do not exactly know the source of that map. So, I would be grateful, if someone could provide me the source of such a map, which shows the vegetation data gap/or intensity of vegetation survey/ or vegetation data availability across the globe. Thanks in advance!
I am currently looking at the dissappearance of wetlands/marshlands in and around Chennai. What would be the best month to get a good look at the vegetation development. December/january after the north east monsoon has hit the area?
I've seen with reason that we can distinguish between two types of vegetation by thermal data...and now there is a person how worked on designing algorithm in this section that can do this differentiation automatically? To help each other to do a research.
We seek to define the reflectance plots of some halophytic plants using specific vegetation indices as it is different from other kind of vegetation?!
I have read already dozens of book chapters and papers on the notation of Anne Chao et al. on how they define abundance based diversity data and incidence based diversity data. Abundance based means that for an ("plotless"?) area there is a complete (?) count of, let´s say all tree species and their respective number. Incidence based data refers to the case when I have sampling units spread across an area and list the species in these sampling units. Then, the information on the species is reduced to presence/absence and I count in how many plots a species occured in order to have some kind of information on the species frequency.
However, what do I do if I have counted all tree indivduals of trees in let´s say 30 plots? That was done for three different regions (which I want to compare), I counted about 5000 individual trees, in total and now one tells me that I have to reduce the count to 0/1? Or is it allowed to pool the data (see Gotelli and Colwell 2001) and sum up all individuals for one region? Is this then still a "true" abundance data set? Am I corrupting any rules then?
I hope that someone has a good explanation :)
Gotelli, N. J., & Colwell, R. K. (2001). Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecology letters, 4(4), 379-391.
Brazilian water agency (ANA) provides water stage and water discharge from many monitoring stations in Brazil. However, provided tables have a weird structure and are wide-structured.
Since this dataset is widely used around the world, I'm wondering if anyone have a script in Python, R, Matlab or any other language to format those tables to a more "readable" long-structured format?
(attached one of those tables)
I am experimenting with some datasets at hand and would like to try REVEALS (Regional Estimates of VEgetation Abundance from Large Sites) model (Sugita 2007) that provides parameters for landscape openness. I extensively searched the internet to see how REVEALS could be accessed, but haven't found much except that it is run as part of the POLLSCAPE which used to be accessed at http://www.geog.ucl.ac.uk/ (according to Sugita 2007 Encyclopedia of Quaternary Science); but now the website has no information about any of the above.
Can I anyone please help me in terms of identifying the source of this model and explaining the initial steps of its application?
I am working on LULC change detection by applying change detection techniques like image differencing, image rationing, PCA, Tasseled Cap transformation which produce change or no-change binary output. After that I have done supervised classification of original image and then applied post classification. Now I want to do cross tabulation between the change detection results derived for different techniques against the post classification data. But I could not understand how to do?
For proper management of river ecosystem how ecological flow is important and by which method it can be calculated for particular river?
Key words: Flash flood - Gully and Rill -Land Use - Vegetation covers - Topography.
How can i combine all in one model? And how can i quantify these factors?
In Europe, vegetation growth is related to minimum temperatures of 5 degrees or higher. Is there a minimum temperature for vegetation growth in the southern African region? And if so, how low?
I am using linear (Ordinary Least Squares) regression to estimate the coefficients and model fitness for vegetation in an ecological study. However, after model fit, tests showed that the linear regression violates 1) normality of error terms 2) is heteroscedastic (non-constant) variance of error terms and 3) likely spatially correlated error terms(non-indepedence). What alternative linear regression model should i use? Or how do i solve for these problems to meet the assumptions in regression?
Is there any correlation of soil organic carbon, inorganic carbon, total carbon and total nitrogen concentration with leaf total carbon and total nitrogen concentration?
I have GPS data of the localities of occurrence of a particular species. I want to know that from this data how can I know the Extent of Occurrence and Area of Occurrence of that species?
PC-ORD needs a specific way of data entry. I need a software which can do Ordination and can calculate diversity index with a simple data entry method.
I am planning to assess the impacts of climatic (rainfall, temperature, snow cover) and non-climatic (human and livestock population) factors to vegetation cover in a river basin in Nepal. I saw few papers, some are using PCA and some partial correlation method for identifying the relations? Any suggestions?
Somewhere in my head it resonates that (plant) species occupy more specific niches at the edge of their distribution range. They become ecological specialists, whereas in the range center they are less demanding. I could imagine this theoretically, but I cannot find early or recent references
Who can help me? Thank you in advance!!
I am almost certain of the first photo to be Sorghum bicolor L. What is the species of second photo? Sorghum ........... The local people gave different vernacular names and I guess these are also two different Sorghum species. Right?
The fourth and fifth photos are from the same species; It is naturally occurring and also cultivated, harvested and sold by local people specially in northern Ghana.
EVI index became extremely popular due to its ability to eliminate background and atmosphere noises, as well as its non-saturation in high biomass regions while NDVI asymptotically saturates in high biomass regions.
If EVI has such advantages over NDVI, why do we use NDVI ? In what kind of studies we should choose one over another ?
On the base of leaves reflectance data obtained by remote sensing method I calculate several vegetation indices (VI), which I found out in literature. Unfortunately no one of authors comments what the differences in the obtained indices of control and infected plants presents.
I want apply different statistical tools (methods) to analyse my ethnomedicinal and ethnobotanical data and information.
I have collected data from 4 small mountain streams with permanent flow or with dry months. I took between about 74 plots with 40mx 20m size, collecting data related to tree species richness, number of individuals, height, DBH, tree distance from river bank, and regeneration . Site characteristics and water regime in the river is also recorded, as well as number of dry months (if any). My aim is to study the relationship between actual dominant tree or shrub species, and their regeneration, to better understand successions (if any). Please provide links or publications if available as I have limited access.
I have collected data from 4 small mountain streams with permanent flow or with dry months. I took between about 74 plots with 40mx 20m size, collecting data related to tree species richness, number of individuals, height, DBH, tree distance from river bank, and regeneration . Site characteristics and water regime in the river is also recorded, as well as number of dry months (if any). My aim is to study riparian tree (and shrub) distribution according to distance from riverbank and altitude, as well as according to river regime. Then to study the relationship between actual dominant tree or shrub species, and their regeneration, to better understand successions (if any),
Are there any environmental gradients that one might look out for within a particular landscape? I'm from India and mostly concerned about tropical rainforest vegetation but any information would be most welcome at this point.
I collected this Dactylorhiza from NW of Iran in a wetland at 2500 m. I found only one individual between many individual of Dactylorhiza umbrosa. As I know, this kind of Dactylorhiza with such white flower have not been observed so far in Iran. I don't know it is a diffrent species, a hybrid or just a variation in color of flowers within Dactylorhiza umbrosa? please help me to identify that.
thanks so much
We have found that as follows:
Firstly, there was an increased photosynthetic rate in grazed plots as compared to non-grazed plots for both the tussock grass and the deep-rooted grass.
Secondly, there was a phenomenon that deep-rooted grass grows basal leaves in grazed plots, but the tussock-grass does not.
I can’t make a sense of it. I guess there may be a tradeoff between the competition and the ability in withstand grazing between the tussock-grass and deep-rooted grass?
Could you give me some information about it?
Any help appreciated very much!
I have a dataset or co-occuring trees sampled from a stand. Predawn water potential varies during the dry season. Since we assume that predawn water potential depends is measured at low (or 0) transpiration rates I tend to argue that the differences are due to differences in rooting depths. However, I wonder have connections of predawn water potential and rooting depths been explored in a systematic way?
There are two subspecies: Asphodelus bento-rainhae ssp. bento-rainhae is found in Portugal and Asphodelus bento-rainhae ssp. salmanticus is present in Spain. The two subspecies are not closely related genetically.
This species is classified as Vulnerable D2, as it is only found in four locations (two in Portugal and two in Spain), in a very tiny area of occupancy. If, despite conservation actions, the quality of its habitat was to decrease further, this species would qualify for an Endangered category.
The research focuses to develop an index for Wetland Health
Please hme elp find geobotanical descriptions of Stipetum lessingianae Soό in 1948! Ukrainian Azov steppes phytocoenology describe and refer to Stipetum lessingianae Soό 1948 (Kostylev et al. 1986). However, I have not found descriptions of this association.
In his article on the steppes of Kursk, "Comparative study of the vegetation in the forest-steppe zone of the USSR" 1959, page 279, Dr. Soό writes: "... Stipetum lessingianae Soό (27) 46 is the most representative of the western steppes nizkozlakovyh ..."
Where can I find descriptions of the association Stipetum lessingianae Soό 1948?
Reproductive maturity and long distance dispersal are important criteria in the spatio-temporal expansion of invasive tree species. I want to know how far the vegetative growth rate is directly or indirectly involved in this process.
I would like to prepare an index or model for damage estimating that can be applied for insurance of rangeland and natural resources cover.
I'm dealing with a diverse genus (>50 spp) that contains a great deal of cosmopolitan fungal species, and I have a set of DNA sequences of one to three genes. I would like to know if there is a way to quantify the distance between populations from different countries on different continents (and see if I can relate the geographic distance to genetic distance). It seems obvious that using Euclidian distances is biologically meaningless. How can I compare populations of a species that is distributed in, say, France, India, and South Africa (just to give an extreme example)? Is there a way to consider biomes? How can I account for them moving across the ocean?
I think my question is rather complex, but I would love to hear all sort of opinions and suggestions.
I'm doing a research about the serpentine flora in northern Greece and I am looking for accessible literature/articles about the ecology of serpentine soils. Could anyone help me?