Pattern and vegetation–environment relationships in a boreal forested wetland in northeastern Ontario

1995 ◽  
Vol 73 (4) ◽  
pp. 629-637 ◽  
Author(s):  
John K. Jeglum ◽  
Fangliang He
Keyword(s):  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Detrended Correspondence Analysis ◽  
Forested Wetland ◽  
Strongly Correlated ◽  
Loss On Ignition ◽  
Data Set ◽  
Axis I ◽  
Environmental Measures ◽  
Physical And Chemical

A forested wetland data set from northeastern Ontario, consisting of species cover and environmental measures in 43 stands, was analyzed with canonical correspondence analysis. Results showed two main vegetational gradients related to factor complexes of peat depth – moisture (mire margin to mire expanse) and pH–calcium. Stands within each of the vegetation types were positioned closely, and gradients of types were similar to those from earlier analyses, suggesting the validity of a previous classification. Axis I of the ordination was highly related to peat depth, several elements (Al, Fe, and Cu), loss on ignition, bulk density, and water content in peat. Axis II was highly related to loss on ignition, depth of fibric layer, pH, and several elements (Ca, Mg, Mn, and N). The number of species in a plot was strongly correlated to the pH–calcium gradient, whereas vegetation cover was strongly correlated to the peat depth – moisture gradient. Analysis with detrended correspondence analysis gave results very similar to canonical correspondence analysis, suggesting that there was a relatively high correspondence between vegetational and environmental gradients. Environmental measures were partitioned into physical and chemical attributes, to detect the relative contribution to vegetational variation. Both physical and chemical variables were important, and 81% of the variation in vegetation was explained by the environmental measures. Key words: boreal forest, multivariate analysis, Ontario, wetlands, vegetation pattern, diversity.

scholarly journals The vegetation types and management units of Goedverwacht farm in the mixed bushveld of the Northern Province, South Africa

Koedoe ◽  
1997 ◽  
Vol 40 (2) ◽  
Author(s):  
L. Breebaart ◽  
M. Deutschlander
Keyword(s):  
Plant Communities ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Gradient ◽  
Detrended Correspondence Analysis ◽  
Northern Province ◽  
Computer Programme ◽  
Data Set ◽  
Management Units ◽  
Floristic Data

An analysis of the vegetation of Goedverwacht farm in the mixed bushveld of the Northern Province is presented. Releves were compiled in 33 stratified random sample plots. Eight distinct plant communities were identified by means ofBraun-Blanquet pro-cedures. Detrended correspondence analysis (DCA) was applied to the floristic data set using the computer programme DECORANA (Detrended Correspondence Analysis) to determine a probable environmental gradient and to facilitate in the identification of management units. The computer programme CANOCO (Canonical Correspondence Analysis) was used to apply canonical correspondence analysis (CCA) to the floristic data set. Two management units were determined by means of vegetation ordinations and soil data. A classification, description and ecological interpretation of the plant communities as well as a description of the management units are presented.

scholarly journals Soil and phytosociological characterization of an area with predominance of arnica (Lychnophora pohlii sch. bip.)

2013 ◽  
Vol 37 (3) ◽  
pp. 565-571 ◽  
Author(s):  
André Rodrigues da Cunha Gianotti ◽  
Maria José Hatem de Souza ◽  
Israel Marinho Pereira ◽  
Evandro Luiz Mendonça Machado ◽  
Artur Duarte Vieira ◽  
...  
Keyword(s):  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Folk Medicine ◽  
Chemical Properties ◽  
Spatial Proximity ◽  
Soil Parameters ◽  
Strongly Correlated ◽  
Physical And Chemical ◽  
The Relationship

Lychnophora pohlii Sch. Bip. (Asteraceae), known as "Arnica mineira", is widely used in folk medicine and very abundant in the altitude vegetation of rocky grassland. The aim of this work was to study the density of this species and its relationship with soil parameters in rocky grassland in Diamantina, in the Upper Jequitinhonha region, Minas Gerais. Ten contiguous 20 x 50 m plots were marked (total sampled area 10,000 m²) on the campus Juscelino Kubitschek of the Federal University of Jequitinhonha and Mucuri Valleys (UFVJM). The plants in these plots were evaluated for frequency, dominance and density. The relationship between the density of this species with nine soil physical and chemical properties was analyzed by means of canonical correspondence analysis (CCA). The highest plant abundance (I) of the species Lychnophora pohlii Sch. Bip. was found in the vegetation sampling areas: plot 6 with 255 plants, plot 7 with 173, plot 8 with 189, plot 9 with 159, and plot 1 with 151 plants. In these areas, the floristic soil characteristics were similar, resulting in spatial proximity in the ACC diagrams. The density of Lychnophora pohlii was higher in plots with higher pH, P-rem and base saturation, the variables most strongly correlated with the first axis of canonical correspondence analysis.

scholarly journals Kimia Fisik Perairan dan Ektoparasit Ikan Nila dan Patin Di Situ Gintung, Tangerang Selatan, Banten

2019 ◽  
Vol 5 (2) ◽  
pp. 203
Author(s):  
Dinda Rama Haribowo ◽  
Syifa Annisa ◽  
Nur Kholidah ◽  
Nia Dzirwatul Izza ◽  
Pratiwi Amalia Zahrah ◽  
...  
Keyword(s):  
Water Quality ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Poor Water Quality ◽  
Standard Quality ◽  
Net Cages ◽  
Physical And Chemical

Poor water quality based on physical and chemical waters is one of the factors that influence the infection and presence of fish ectoparasites. The aim of study was to determine the physical and chemical waters, the types and prevalence of ectoparasites and the correlation of ectoparasites with physical and chemical waters. The study was conducted in Situ Gintung, South Tangerang from March to June 2018 with samples from Floating Net Cages (KJA) and fishing. The results showed that the physical and chemical waters generally within standard quality for fish cultivation. The number and type of fish ectoparasites consist of Trichodina sp., Chilodonella sp., Litonotus sp., Vorticella sp., Dactylogyrus sp. and Capillaria sp. Based on the Canonical Correspondence Analysis (CCA) shows that ectoparasites are affected by physical and chemical waters.

The prediction of understory vegetation by environmental factors for the purpose of site classification in forestry: an example from northern Ontario using residual ordination analysis

1985 ◽  
Vol 15 (6) ◽  
pp. 1099-1108 ◽  
Author(s):  
T. J. Carleton ◽  
R. K. Jones ◽  
G. Pierpoint
Keyword(s):  
Correspondence Analysis ◽  
Forest Ecosystem ◽  
Detrended Correspondence Analysis ◽  
Understory Vegetation ◽  
Soil Conditions ◽  
Site Classification ◽  
Data Set ◽  
Local Composition ◽  
Ecosystem Classification ◽  
Ordination Analysis

Problems arise in the use of understory vegetation as an indicator of site condition in that impermanent factors such as microclimate, succession, and chance may play significant roles in determining local composition. Residual ordination analysis is a method which facilitates quantification of the sources of variation in understory vegetation over a landscape. Here it is applied to survey data, representing 250 stands upon which the forest ecosystem classification programme for the Clay Belt portion of northeastern Ontario is based, to test the premise that vegetation types will differentiate soil conditions for forestry purposes. Ordination of the data by detrended correspondence analysis yielded a bivariate scatterplot which, through visual appraisal, seemed readily interpretable in terms of site-related nutrient and moisture gradients. Formal exploration, using canonical redundancy analysis, yielded the following predictive model: understory vegetation (detrended correspondence analysis axes 1 and 2) = soils (67%) + canopy (8%) + succession (1%) + error (24%). Extraction of residual ordinations confirmed this general model and demonstrated that although canopy and successional influences are minor in the data, they are significant. Because the nonsite-related, predictable components account for only 9% of the variation at most, the premise of the existing forest ecosystem classification system is judged to be sound insofar as the data upon which it is based adequately describe the range of commercial stand conditions normally encountered. The results are discussed in relation to vegetation survey design and the performance of residual ordination analysis on a large data set is assessed.

Synanthropic vegetation of the Eragrostion cilianensi-minoris alliance in the Czech Republic

Biologia ◽  
2011 ◽  
Vol 66 (6) ◽  
Author(s):  
Radomír Němec ◽  
Zdeňka Lososová ◽  
Pavel Dřevojan ◽  
Kristýna Žáková
Keyword(s):  
Czech Republic ◽  
Correspondence Analysis ◽  
Detrended Correspondence Analysis ◽  
Vegetation Types ◽  
Data Set ◽  
The Czech Republic ◽  
Synanthropic Vegetation ◽  
Arable Fields ◽  
Twinspan Classification ◽  
Southern Moravia

AbstractA synthesis of the alliance Eragrostion cilianensi-minoris in the Czech Republic is presented on the basis of 82 relevés including new unpublished data. A TWINSPAN classification and detrended correspondence analysis were used to identify the main vegetation types included in the alliance Eragrostion cilianensi-minoris. A syntaxonomic revision of the data set revealed five associations of the alliance: Digitario sanguinalis-Eragrostietum minoris, Portulacetum oleraceae, Eragrostio poaeoidis-Panicetum capillaris, Cynodontetum dactyli, and Hibisco trioni-Eragrostietum poaeoidis. The latter was recently found in several arable fields in Southern Moravia (Czech Republic) and was newly characterized.

Ordination by detrended correspondence analysis (DCA) of the vegetation of Swartboschkloof, Jonkershoek, Cape Province

Bothalia ◽  
1987 ◽  
Vol 17 (1) ◽  
pp. 121-129 ◽  
Author(s):  
D. J. Mcdonald
Keyword(s):  
Soil Moisture ◽  
Plant Communities ◽  
Correspondence Analysis ◽  
Detrended Correspondence Analysis ◽  
Vegetation Classification ◽  
Environmental Data ◽  
Strongly Correlated ◽  
Intensive Study ◽  
Dca Ordination ◽  
Soil Moisture Status

The data of a Braun-Blanquet vegetation classification was ordinated using detrended correspondence analysis (DCA). This was done at the Fynbos Biome intensive study site, Swartboschkloof, Jonkershoek, to investigate the factors determining the distribution of the plant communities. Superimposition of environmental data on the DCA ordination confirmed the indications of the Braun-Blanquet classification that the distribution of plant communities is most strongly correlated with soil geology and, to a lesser extent, with soil moisture status. The ordination also proved useful for examining the relationships between the transitional communites and the distinct communities of Swartboschkloof.

The vegetation and ecological gradients of calcareous mires in the South Park valley, Colorado

2003 ◽  
Vol 81 (3) ◽  
pp. 201-219 ◽  
Author(s):  
J Bradley Johnson ◽  
David A Steingraeber
Keyword(s):  
Water Table ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Conditions ◽  
Detrended Correspondence Analysis ◽  
Nutrient Level ◽  
Ecological Gradients ◽  
The South ◽  
Rich Fen ◽  
South Park

The vegetation, environment, and ecological gradients present on three calcareous mires in the South Park valley, Park County, Colorado, were investigated. Vegetation was classified into four habitat classes, nine subclasses, and twelve species associations using two-way species indicator analysis (TWINSPAN). Detrended correspondence analysis (DCA) was used to ordinate vegetation samples along two axes representing the three predominant ecological gradients: water table height, miremargin to expanse, and region. Canonical correspondence analysis (CCA) was used to directly relate local environmental conditions to vegetation. Water table depth, microtopographical development, soil and water pH and nutrient level, soil organic matter, and hydraulic head were significantly correlated with vegetation gradients. The mire soils consist of intermixed areas of organic and mineral soils. Mire soils and water are highly alkaline and nutrient-rich. Mean pore water calcium concentration on these mires is 115 mg/L, electrical conductivity averages 575 µS, and mean pH is 7.4. Owing to these conditions, the fen floras include a number of highly minerophilic species. Based on water chemistry and species criteria, each site was classified as rich to extremely rich fen, with the two fen types mixing in complex patterns according to local environmental conditions. The species Trichophorum pumilum, Salix candida, Salix myrtillifolia, Carex microglochin, Carex viridula, Carex scirpoidea, Eriophorum gracile, Triglochin maritimum, Triglochin palustris, Kobresia myosuroides, Kobresia simpliciuscula, Thalictrum alpinum, Scorpidium scorpioides, Scorpidium turgescens, and Calliergon trifarium were determined to be indicative of extremely rich fen conditions in the southern Rocky Mountains.Key words: Colorado, canonical correspondence analysis, detrended correspondence analysis, extremely rich fen, gradient analysis, mire.

Spatial and temporal stability of commercial groundfish assemblages off Oregon and Washington as inferred from Oregon trawl logbooks

2000 ◽  
Vol 57 (12) ◽  
pp. 2443-2454 ◽  
Author(s):  
Yong-Woo Lee ◽  
David B Sampson
Keyword(s):  
Correspondence Analysis ◽  
Temporal Stability ◽  
Detrended Correspondence Analysis ◽  
Hierarchical Cluster ◽  
General Linear Model ◽  
Multivariate Methods ◽  
Strongly Correlated ◽  
Study Region ◽  
Spatial And Temporal Characteristics ◽  
Logbook Data

Spatial and temporal characteristics of species compositions for 15 major commercial groundfish species off Oregon and Washington (U.S.A.) were studied using Oregon bottom trawl logbook data from 1987 to 1993. Screening procedures to remove questionable data from the original logbook files resulted in the exclusion of information from 46% of the total available tows. Two multivariate methods, detrended correspondence analysis and Ward's hierarchical cluster analysis, were used to derive species ordinations and groupings. A general linear model developed for the primary detrended correspondence analysis axis scores showed that the species compositions were strongly correlated with depth and minimally correlated with the other environmental variables examined (latitude, month, and year). However, there were distinct seasonal changes in species composition at the shallower depths, consistent with the movement of deepwater species onto the shelf during summer. Annual trends in the species compositions were not evident even though the study region is very dynamic oceanographically and was heavily fished during the study period.

Gradient analysis of forests of the Sangre de Cristo Range, Colorado

1990 ◽  
Vol 68 (1) ◽  
pp. 193-201 ◽  
Author(s):  
Robert B. Allen ◽  
Robert K. Peet
Keyword(s):  
Correspondence Analysis ◽  
Soil Ph ◽  
Populus Tremuloides ◽  
Environmental Gradients ◽  
Detrended Correspondence Analysis ◽  
Base Saturation ◽  
Strongly Correlated ◽  
Moisture Index ◽  
Compositional Gradient ◽  
Sangre De Cristo

Interrelationships between dominant compositional and environmental gradients were studied using 186 forest stands sampled on the east slope of the Sangre de Cristo Range, Colorado. Detrended correspondence analysis and detrended canonical correspondence analysis were used to analyze indirect and direct gradients, respectively. The dominant compositional gradient was strongly correlated with elevation. Increasing elevation was associated with decreasing soil pH and percent base saturation, and increasing total soil N. Ordination of stands stratified by elevation showed the major compositional gradient within each elevation class was strongly correlated with a topographic moisture index. Most soil variables correlated with this gradient in low and high elevation classes. In mid-elevation forests, a third compositional gradient correlated with soil pH, percent base saturation, and potential solar radiation. In these forests, Pinus contorta and Pseudotsuga menziesii were associated with acidic soils on north-facing slopes, whereas Populus tremuloides and Abies concolor were associated with base-rich soils on south-facing slopes. Ordination axes accounted for least variation in comparatively young mid-elevation forests. A plausible explanation is that the mid-elevation forests represent an unpredictable stage in forest development where competition has not yet had sufficient time to sort species along environmental gradients.

scholarly journals VEGETATION-ENVIRONMENT RELATIONSHIPS IN MEDITERRANEAN MOUNTAIN FORESTS ON LIMELESS BEDROCKS OF SOUTHERN ANATOLIA, TURKEY/AUGALIJOS IR APLINKOS VEIKSNIŲ SĄSAJOS VIDURŽEMIO JŪROS BASEINO KALNŲ MIŠKUOSE/ РАСТИТЕЛЬНОСТЬ ГОРНЫХ ЛЕСОВ НА НЕИЗВЕСТКОВОЙ ПОРОДЕ ОКРЕСТНОСТЕЙ СРЕДИЗЕМНОМОРЬЯ В ЮЖНОЙ АНАТОЛИИ (TУРЦИЯ

2009 ◽  
Vol 17 (3) ◽  
pp. 154-163 ◽  
Author(s):  
Kursad Ozkan ◽  
Huseyin Senol ◽  
Serkan Gulsoy ◽  
Ahmet Mert ◽  
Halil Suel ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Forest Restoration ◽  
Field Capacity ◽  
Mountain Forests ◽  
Total Calcium ◽  
Data Set ◽  
Axis Ii ◽  
Wood Extraction ◽  
Axis I ◽  
Environmental Measures

The forest resources of south Anatolia (Turkey) are characterized by degradation due to wood extraction, overgrazing and fire. In the context of forest restoration, afforestation, conservation, utilization and sustainability, vegetation‐environment relationships need to be known. In the study, a data set from Mediterranean mountain forests on limeless bedrocks of southern Anatolia, consisting of species cover and environmental measures in 56 sample plots, was examined with canonical correspondence analysis. Results illustrated two vegetation gradients related to factor complexes of altitude‐aspect and pH‐total calcium carbonate. Axis I of the ordinate was strongly related to altitude, aspect, available water percentage of Bv, field capacity percentage of Bv, schistose quartzite and soil stoniness percentage. Axis II was strongly related to total lime percentage of Ah, total lime percentage of Bv, pH of Bv, schistose quartzite, pH of Cv, pH of Ah, slope degree, respectively. Species richness was correlated to pH‐total calcium carbonate gradient whereas total vegetation cover was correlated to altitude‐aspect gradient. Santrauka Pagrindinės Pietų Anatolijos (Turkija) miškų išteklių nykimo priežastys – per dideli medienos kirtimo mastai, augimviečių nuganymas ir gaisrai. Atkuriant, želdant miškus, naudojant išteklius ir siekiant užtikrinti šių dalykų darną, turi būti ištirta augalijos ir aplinkos veiksnių tarpusavio sąsaja. Tyrimams duomenys imti iš Viduržemio jūros baseino kalnų miškų, augančių mažo kalkingumo uolienose Pietų Anatolijoje. Augimviečių dirvožemio tipai labai įvairūs. Pasirinkta 56 pavyzdiniai ploteliai, taikyta kanoninio panašumo analizė. Rezultatai rodo, kad du augalijos vegetacijos gradientai susiję su kompleksu veiksnių – teritorijos aukščiu ir dirvožemio pH, nustatomu naudojant CaCO3 . Atlikus tyrimus, pirmojoje aplinkos veiksnių grupėje koreliavo teritorijos aukštis, augalų pasisavinama vandens dalis Bv dirvožemio horizonte, šio dirvožemio horizonto derlingumas. Antrojoje aplinkos veiksnių grupėje – Ah procentinė kalkių dalis, kvarcito sluoksnis, Cv, Ah ir Bv horizontų pH, šlaito nuolydžio laipsnis. Rūšies gausa priklausė nuo pH, o bendra augalijos danga buvo susijusi su aukščio gradientu. Резюме Леса Южной Анатолии исчезают из-за получения древесины, большого потравления и пожаров. При решении проблем восстановления, озеленения, охраны, использования и содержания лесов следует знать, каково воздействие факторов окружающей среды на растительность. Исследовались горные леса бассейна Средиземного моря, растущие на горных неизвестковых породах. Результаты показали значение для растительности двух градиентов: высоты и pH (CaCO3 ). Ось ординат I в значительной мере зависит от высоты, доступности воды Bv (%), каменистости почвы (%) и др. На оси II установлена большая зависимость от общего количества извести в слоях Ah и Bv, pH в слоях Cv и Ah и угла откоса. Многообразие сортов растительности коррелировалось с градиентом pH (CaCO3 ), в то время как общее покрытие растительности коррелировалось с градиентом высоты.

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