scholarly journals La vegetación del Norte del Perú: de los bosques a la jalca en Cajamarca

2015 ◽  
Vol 40 ◽  
pp. 157-190 ◽  
Author(s):  
Antonio Galán de Mera ◽  
Isidoro Sánchez Vega ◽  
Juan Montoya Quino ◽  
Eliana Linares Perea ◽  
José Campos de la Cruz ◽  
...  
Keyword(s):  
Plant Communities ◽  
Dry Forest ◽  
New Order ◽  
Humid Climate ◽  
New Associations ◽  
The North ◽  
Hura Crepitans ◽  
Northern Peru ◽  
The Moment ◽  
Muntingia Calabura

Español.   El departamento de Cajamarca, en el Norte del Perú, se caracteriza en general por un clima más húmedo que el resto del territorio andino peruano occidental. Teniendo en cuenta el paralelismo entre el clima y las unidades de vegetación que ofrecen los pisos bioclimáticos, los ombrotipos, la geología y los suelos, y levantando inventarios según la metodología de Braun-Blanquet, estudiamos la vegetación de este territorio. Se describen 2 comunidades vegetales, 8 asociaciones, 3 subasociaciones, 3 alianzas, 1 orden y 1 clase fitosociológica. Como resultado, se analizan la comunidad de Cecropia montana y Heliocarpus americanus (termotropical subhúmedo-húmeda) y de Muntingia calabura y Hura crepitans (infratropical seco-subhúmeda), ambas de la clase Nectandro laevis-Licarietea canellae presente en el norte del territorio. Hacia el sur, los bosques lauroides y esclerófilos están representados por las nuevas asociaciones Axinaeo nitidae-Podocarpetum oleifolii (bosques mesotropicales, húmedo-hiperhúmedos), Verbesino auriculigerae-Siparunetum muricatae (bosques mesotropicales húmedo-hiperhúmedos de áreas alteradas), Berberido beauverdianae-Myrcianthetum myrsinoidis (bosques del piso mesotropical inferior seco-subhúmedo) y Aristeguietio discoloris-Kageneckietum lanceolatae (bosques del piso mesotropical superior seco-subhúmedo), todas agrupadas en la nueva alianza Monnino pilosae-Myrcianthion myrsinoidis (Pruno rigidae-Oreopanacetea floribundi). Las asociaciones nuevas Baccharito latifoliae-Monactinetum flaverioidis (supra-mesotropical subhúmedo-seca) y Monactino flaverioidis-Colignonietum parviflorae (mesotropical húmeda) son las arbustedas sucesionales de los bosques y se agrupan en la alianza Otholobio munyensis-Rubion robusti all. nova y en la nueva clase andina Clematido peruvianae-Baccharitetea latifoliae. Se describen dos nuevas asociaciones de los pajonales del páramo (“jalca”) con sus subasociaciones: Calamagrostio tarmensis-Hypericetum laricifolii (pajonales supratropicales húmedos del sector Chota-Contumazá), con la subasociación cortaderietosum nitidae en áreas rocosas, y Agrostio tolucensis-Paspaletum bonplandiani (pajonales orotropicales húmedos-hiperhúmedos del sector Chota-Contumazá), con la subasociación puyetosum fastuosae en suelos húmedos, y calamagrostietosum curvulae como una subasociación de transición hacia los pajonales de la puna del centro del Perú. Además, hemos reconocido y lectotipificado la asociación supratropical húmeda Oreobolo goeppingieri-Hypericetum laricifolii, característica del sector biogeográfico Loja-Cutervo. Todas estas asociaciones de pastizales pertenecen a la nueva alianza Agrostio tolucensis-Paspalion bonplandiani y al nuevo orden Agrostio tolucensis-Paspaletalia bonplandiani (Calamagrostietea vicunarum). Por otra parte, presentamos un esquema sintaxonómico con todas las clases fitosociológicas estudiadas por el momento en el departamento de Cajamarca, incluyendo bosques secos y vegetación con cactus y otras plantas suculentas (Acacio macracanthae-Prosopidetea pallidae), alisedas (Alnetea acuminatae), bosques altoandinos (Polylepidetea tarapacano-besseri), y vegetación helofítica de riveras (Tessario integrifoliae-Baccharitetea salicifoliae). Como resultado de este estudio fitosociológico comentamos la biogeografía del N del Perú estableciendo los sectores Loja-Cutervo y Chota-Contumazá, y finalmente hemos cartografiado la vegetación potencial de Cajamarca English. The Department of Cajamarca, in Northern Peru, is generally characterized by a more general humid climate that in the rest of the occidental Andean Peruvian territory. Taking account of the parallelism between climate and vegetation units offered by bioclimatic belts and ombrotypes, geology and soils, and making plots according to the Braun-Blanquet methodology, the vegetation of the territory was studied. Two plant communities, 8 associations, 3 subassociations, 3 alliances, 1 order and 1 phytosociological class are described. As a result, we have analyzed the Cecropia montana and Heliocarpus americanus (thermotropical subhumid-humid) and the Muntingia calabura and Hura crepitans (infratropical dry-subhumid) plant communities, both belonging to the Nectandro laevis-Licarietea canellae class in the North of the territory. To the South, laurel like and sclerophyllous forests are represented by the new associations Axinaeo nitidae-Podocarpetum oleifolii (mesotropical, humid-hyperhumid forests), Verbesino auriculigerae-Siparunetum muricatae (mesotropical humid-hyperhumid forests on disturbed areas), Berberido beauverdianae-Myrcianthetum myrsinoidis (lower mesotropical dry-subhumid forests), and Aristeguietio discoloris-Kageneckietum lanceolatae (upper mesotropical dry-subhumid forests), all grouped into the new alliance Monnino pilosae-Myrcianthion myrsinoidis (Pruno rigidae-Oreopanacetea floribundi). The supra-mesotropical, subhumid-dry Baccharito latifoliae-Monactinetum flaverioidis and the mesotropical humid Monactino flaverioidis-Colignonietum parviflorae new associations are the successional shrublands of the forests, grouped into the new alliance Otholobio munyensis-Rubion robusti and into the new Andean class Clematido peruvianae-Baccharitetea latifoliae. Two new associations for the paramo (“jalca”) grasslands have been described with their subassociations: Calamagrostio tarmensis-Hypericetum laricifolii (supratropical humid grasslands from the Chota-Contumazá biogeographical sector), with cortaderietosum nitidae subassociation on rocky areas, and Agrostio tolucensis-Paspaletum bonplandiani (orotropical humid-hyperhumid grasslands from the Chota-Contumazá biogeographical sector), with puyetosum fastuosae subassociation on humid soils, and calamagrostietosum curvulae as transitional subassociation to the puna grasslands in Central Peru. Furthermore, we have recognized and lectotypified the supratropical humid association Oreobolo goeppingieri-Hypericetum laricifolii from the Loja-Cutervo biogeographical sector. These grassland associations belong to the new alliance Agrostio tolucensis-Paspalion bonplandiani and to the new order Agrostio tolucensis-Paspaletalia bonplandiani (Calamagrostietea vicunarum class). Besides, we present a syntaxonomical scheme with all the phytosociological class studied for the moment in the Department of Cajamarca, including dry forest and succulent vegetation with cactus (Acacio macracanthae-Prosopidetea pallidae), Andean alder forests (Alnetea acuminatae), high Andean forests (Polylepidetea tarapacano-besseri), and helophytic river vegetation (Tessario integrifoliae-Baccharitetea salicifoliae). As a result of the study of the phytosociological units of Cajamarca, we comment the biogeography of Northern Peru establishing the Loja-Cutervo and Chota-Contumazá sectors, and finally, we have maped the potential vegetation of Cajamarca.

scholarly journals La vegetación del Norte del Perú: de los bosques a la jalca en Cajamarca

2017 ◽  
Vol 40 ◽  
pp. 157
Author(s):  
Antonio Galán de Mera ◽  
Isidoro Sánchez Vega ◽  
Juan Montoya Quino ◽  
Eliana Linares Perea ◽  
José Campos de la Cruz ◽  
...  
Keyword(s):  
Plant Communities ◽  
Dry Forest ◽  
New Order ◽  
Humid Climate ◽  
New Associations ◽  
The North ◽  
Hura Crepitans ◽  
Northern Peru ◽  
The Moment ◽  
Muntingia Calabura

Español.   El departamento de Cajamarca, en el Norte del Perú, se caracteriza en general por un clima más húmedo que el resto del territorio andino peruano occidental. Teniendo en cuenta el paralelismo entre el clima y las unidades de vegetación que ofrecen los pisos bioclimáticos, los ombrotipos, la geología y los suelos, y levantando inventarios según la metodología de Braun-Blanquet, estudiamos la vegetación de este territorio. Se describen 2 comunidades vegetales, 8 asociaciones, 3 subasociaciones, 3 alianzas, 1 orden y 1 clase fitosociológica. Como resultado, se analizan la comunidad de Cecropia montana y Heliocarpus americanus (termotropical subhúmedo-húmeda) y de Muntingia calabura y Hura crepitans (infratropical seco-subhúmeda), ambas de la clase Nectandro laevis-Licarietea canellae presente en el norte del territorio. Hacia el sur, los bosques lauroides y esclerófilos están representados por las nuevas asociaciones Axinaeo nitidae-Podocarpetum oleifolii (bosques mesotropicales, húmedo-hiperhúmedos), Verbesino auriculigerae-Siparunetum muricatae (bosques mesotropicales húmedo-hiperhúmedos de áreas alteradas), Berberido beauverdianae-Myrcianthetum myrsinoidis (bosques del piso mesotropical inferior seco-subhúmedo) y Aristeguietio discoloris-Kageneckietum lanceolatae (bosques del piso mesotropical superior seco-subhúmedo), todas agrupadas en la nueva alianza Monnino pilosae-Myrcianthion myrsinoidis (Pruno rigidae-Oreopanacetea floribundi). Las asociaciones nuevas Baccharito latifoliae-Monactinetum flaverioidis (supra-mesotropical subhúmedo-seca) y Monactino flaverioidis-Colignonietum parviflorae (mesotropical húmeda) son las arbustedas sucesionales de los bosques y se agrupan en la alianza Otholobio munyensis-Rubion robusti all. nova y en la nueva clase andina Clematido peruvianae-Baccharitetea latifoliae. Se describen dos nuevas asociaciones de los pajonales del páramo (“jalca”) con sus subasociaciones: Calamagrostio tarmensis-Hypericetum laricifolii (pajonales supratropicales húmedos del sector Chota-Contumazá), con la subasociación cortaderietosum nitidae en áreas rocosas, y Agrostio tolucensis-Paspaletum bonplandiani (pajonales orotropicales húmedos-hiperhúmedos del sector Chota-Contumazá), con la subasociación puyetosum fastuosae en suelos húmedos, y calamagrostietosum curvulae como una subasociación de transición hacia los pajonales de la puna del centro del Perú. Además, hemos reconocido y lectotipificado la asociación supratropical húmeda Oreobolo goeppingieri-Hypericetum laricifolii, característica del sector biogeográfico Loja-Cutervo. Todas estas asociaciones de pastizales pertenecen a la nueva alianza Agrostio tolucensis-Paspalion bonplandiani y al nuevo orden Agrostio tolucensis-Paspaletalia bonplandiani (Calamagrostietea vicunarum). Por otra parte, presentamos un esquema sintaxonómico con todas las clases fitosociológicas estudiadas por el momento en el departamento de Cajamarca, incluyendo bosques secos y vegetación con cactus y otras plantas suculentas (Acacio macracanthae-Prosopidetea pallidae), alisedas (Alnetea acuminatae), bosques altoandinos (Polylepidetea tarapacano-besseri), y vegetación helofítica de riveras (Tessario integrifoliae-Baccharitetea salicifoliae). Como resultado de este estudio fitosociológico comentamos la biogeografía del N del Perú estableciendo los sectores Loja-Cutervo y Chota-Contumazá, y finalmente hemos cartografiado la vegetación potencial de Cajamarca English. The Department of Cajamarca, in Northern Peru, is generally characterized by a more general humid climate that in the rest of the occidental Andean Peruvian territory. Taking account of the parallelism between climate and vegetation units offered by bioclimatic belts and ombrotypes, geology and soils, and making plots according to the Braun-Blanquet methodology, the vegetation of the territory was studied. Two plant communities, 8 associations, 3 subassociations, 3 alliances, 1 order and 1 phytosociological class are described. As a result, we have analyzed the Cecropia montana and Heliocarpus americanus (thermotropical subhumid-humid) and the Muntingia calabura and Hura crepitans (infratropical dry-subhumid) plant communities, both belonging to the Nectandro laevis-Licarietea canellae class in the North of the territory. To the South, laurel like and sclerophyllous forests are represented by the new associations Axinaeo nitidae-Podocarpetum oleifolii (mesotropical, humid-hyperhumid forests), Verbesino auriculigerae-Siparunetum muricatae (mesotropical humid-hyperhumid forests on disturbed areas), Berberido beauverdianae-Myrcianthetum myrsinoidis (lower mesotropical dry-subhumid forests), and Aristeguietio discoloris-Kageneckietum lanceolatae (upper mesotropical dry-subhumid forests), all grouped into the new alliance Monnino pilosae-Myrcianthion myrsinoidis (Pruno rigidae-Oreopanacetea floribundi). The supra-mesotropical, subhumid-dry Baccharito latifoliae-Monactinetum flaverioidis and the mesotropical humid Monactino flaverioidis-Colignonietum parviflorae new associations are the successional shrublands of the forests, grouped into the new alliance Otholobio munyensis-Rubion robusti and into the new Andean class Clematido peruvianae-Baccharitetea latifoliae. Two new associations for the paramo (“jalca”) grasslands have been described with their subassociations: Calamagrostio tarmensis-Hypericetum laricifolii (supratropical humid grasslands from the Chota-Contumazá biogeographical sector), with cortaderietosum nitidae subassociation on rocky areas, and Agrostio tolucensis-Paspaletum bonplandiani (orotropical humid-hyperhumid grasslands from the Chota-Contumazá biogeographical sector), with puyetosum fastuosae subassociation on humid soils, and calamagrostietosum curvulae as transitional subassociation to the puna grasslands in Central Peru. Furthermore, we have recognized and lectotypified the supratropical humid association Oreobolo goeppingieri-Hypericetum laricifolii from the Loja-Cutervo biogeographical sector. These grassland associations belong to the new alliance Agrostio tolucensis-Paspalion bonplandiani and to the new order Agrostio tolucensis-Paspaletalia bonplandiani (Calamagrostietea vicunarum class). Besides, we present a syntaxonomical scheme with all the phytosociological class studied for the moment in the Department of Cajamarca, including dry forest and succulent vegetation with cactus (Acacio macracanthae-Prosopidetea pallidae), Andean alder forests (Alnetea acuminatae), high Andean forests (Polylepidetea tarapacano-besseri), and helophytic river vegetation (Tessario integrifoliae-Baccharitetea salicifoliae). As a result of the study of the phytosociological units of Cajamarca, we comment the biogeography of Northern Peru establishing the Loja-Cutervo and Chota-Contumazá sectors, and finally, we have maped the potential vegetation of Cajamarca.

scholarly journals A phytosociological analysis and synopsis of the dry woodlands and succulent vegetation of the Peruvian Andes

2016 ◽  
Vol 88 (suppl 1) ◽  
pp. 689-703 ◽  
Author(s):  
ANTONIO GALÁN-DE-MERA ◽  
ISIDORO SÁNCHEZ-VEGA ◽  
ELIANA LINARES-PEREA ◽  
JOSÉ CAMPOS ◽  
JUAN MONTOYA ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Plant Communities ◽  
Sandy Soils ◽  
Dry Forest ◽  
The Other ◽  
Humboldt Current ◽  
Peruvian Andes ◽  
New Associations ◽  
Coastal Desert

ABSTRACT A phytosociological approach to dry forest and cactus communities on the occidental slopes of the Peruvian Andes is presented in base of 164 plots carried out following the Braun-Blanquet method. From them, 52 have been made recently, and the other 112 were taken from the literature. After a multivariate analysis, using a hierarchical clustering and a detendred correspondence analysis, the Acacio-Prosopidetea class (dry forest and cactus communities, developed on soils with some edaphic humidity or precipitations derived from El Niño Current), the Opuntietea sphaericae class (cactus communities of central and southern Peru, on few stabilized rocky or sandy soils) and the Carico-Caesalpinietea class (dry forests of the Peruvian coastal desert, influenced by the maritime humidity of the cold Humboldt Current), are differentiated. Within the Acacio-Prosopidetea class, two alliances are commented: the Bursero-Prosopidion pallidae (with two new associations Loxopterygio huasanginis-Neoraimondietum arequipensis and Crotono ruiziani-Acacietum macracanthae), and the new alliance Baccharido-Jacarandion acutifoliae (with the new associations Armatocereo balsasensis-Cercidietum praecocis and Diplopterydo leiocarpae-Acacietum macracanthae). For the Opuntietea sphaericae class, the association Haageocereo versicoloris-Armatocereetum proceri (Espostoo-Neoraimondion) is described on the basis of plots from hyperarid localities of central Peru. Finally, a typological classification of the studied plant communities is given.

scholarly journals New higher syntaxa of the steppe vegetation in the North Caucasus

2021 ◽  
Vol 2 (9) ◽  
pp. 59-75
Author(s):  
Tatiana Lysenko ◽  
◽  
Kseniia Shchukina ◽  
Valentina Neshataeva ◽  
Dmitry Shilnikov ◽  
...  
Keyword(s):  
New Order ◽  
North Caucasus ◽  
Steppe Vegetation ◽  
New Associations ◽  
The North

Geobotanical studies were carried out in the North Caucasus, in the Stavropol kray (Russia) on Beshtau, Byk, Verblyud, Dzhutsa, Dubrovka, Zolotoy Kurgan, Kokurtly, Lysaya, Mashuk, Yutsa magmatic mountains, Bor-gustan and Dzhinal ringes in 2017, 2019–2021. Syntaxonomic analysis carried out from the standpoint of J. Braun-Blanquet approach (1964) made it possible to establish 2 new associations (Allio albidi–Dictamnetum caucasici ass. nov. hoc loco, Helianthemo buschii–Elytrigietum stipifoliae ass. nov. hoc loco), 2 new alliances (Allio albidi–Dictamnion caucasici all. nov. hoc loco, Helianthemo buschii–Elytrigion stipifoliae all. nov.hoc loco) and 1 new order Galio biebersteinii–Bilacunarietalia microcarpae ordo nov. hoc loco. They are included in the class Festuco–Brometea Br.-Bl. et Tx. ex Soó 1947.

The Goal of the Moment (Summary of the Lecture Delivered by Ivan Ilyin in May 1917)

2019 ◽  
Vol 60 ◽  
pp. 424-428
Author(s):  
Alexandra I. Vakulinskaya
Keyword(s):  
The State ◽  
October Revolution ◽  
Legal Consciousness ◽  
New Order ◽  
History Of ◽  
The Moment

This publication is devoted to one of the episodes of I. A. Ilyin’s activity in the period “between two revolutions”. Before the October revolution, the young philosopher was inspired by the events of February 1917 and devoted a lot of time to speeches and publications on the possibility of building a new order in the state. The published archive text indicates that the development of Ilyin’s doctrine “on legal consciousness” falls precisely at this tragic moment in the history of Russia.

Swamp plant communities with Salix reptans Rupr. and S. lanata L. in the west of tundra zone of Taymyr Peninsula

2003 ◽  
pp. 28-40 ◽  
Author(s):  
L. L. Zanokha
Keyword(s):  
Plant Communities ◽  
Species Group ◽  
Intermediate Position ◽  
Tundra Zone ◽  
The West ◽  
Diagnostic Species ◽  
New Associations ◽  
Mire Vegetation ◽  
Humidity Gradient ◽  
Ecological Regime

The 2 new associations, Carici stantis—Salicetum reptantis and Salico-Polemonietum acutiflori, are described within the all. Caricionstantis of the class Scheuchzerio-Caricetea fuscae R. Tx. 1937 for the northern belt of the typical tundra subzone of Taymyr. The diagnostic species group of the first syntaxon includes plants typical of sites with excessive watering. The ass. Carici stantis—Salicetum reptantis is restricted to bottoms or lower parts of the watershed and moun­tain terrace slopes. The ecological regime of these sites is subject to slight variations reflected in presence/ absence of certain species. Due to floristic differences, the association is subdivided into several subassociations which form a topographic-ecological series along the humidity gradient: epilobietosum palustris→ptilidietosum ciliaris→typicum→petasitetosum frigidi. The ass. Carici stantis—Salicetum reptantis is referred to the all. Caricionstantis which also includes the associations Meesiotriquetris—Caricetumstantis and Pooarcticae—Dupontietumfisheri (also described from the Ragozinka R. basin); the latter occur in the wet depres­sions between sloping hills and the flowing valleys, respectively. If compared to these two, the ass. Carici stantis—Salicetum reptantis is shown to hold an intermediate position between them. The ass. Salico-Polemonietum acutiflori with the 2 variants, Salix lanata and S. reptans, represents various variants of mire vegetation which have under­gone zoogenic transformation (by lemmings). The stands size 1—1.5 m2 in space. The diagnostic species group comprises plants common of the wet mossy stream banks. The association is referred to the all. Caricion stantis, although many diagnostic species of the alliance are not present in its composition. When the new data are available, the association is probable to be separated into an independent alliance.

Sand vegetation of Verkhnecharskaya depression (Zabaikalsky Krai)

2013 ◽  
pp. 29-37
Author(s):  
N. A. Dulepova ◽  
A. Yu. Korolyuk
Keyword(s):  
Plant Communities ◽  
New Associations

The results of syntaxonomical studies of psammophyte vegetation of the Chara sands (Verkhnecharskaya depression Zabaikalsky Krai) are presented. Plant communities on open sands belong to the class Brometea korotkyi Hilbig et Korolyuk 2000 and to the order Oxytropidetalia lanatae Brzeg et Wika 2001. The new alliance Aconogonion chlorochryseum is established. 4 new associations, 3 new subassociations and 2 communities are characterized.

Аquatic and helophytic vegetation of the Yamozero Lake (The Komi Republic)

2011 ◽  
pp. 101-116 ◽  
Author(s):  
B. Yu. Teteryuk
Keyword(s):  
Eastern Europe ◽  
Plant Communities ◽  
Rare Species ◽  
Komi Republic ◽  
European Part ◽  
Regional Level ◽  
North East ◽  
The North ◽  
European Part Of Russia ◽  
Floristic Classification

The results of a sintaxonomical study of plant communities of the Yamozero lake (the North-East of the European part of Russia) are presented. The diversity of the aquatic and helophytic vegetation of the Yamozero lake consists of 16 associations and 2 communities of 6 unions, 4 orders and 2 classes of the floristic classification: Potamogetonetea (7 associations, 2 communities), Phragmito-Magnocaricetea (9 associations). Many of described associations are widely distributed in the Central and the Eastern Europe. Some associations have the boundaries of their ranges. Some communities include 2 rare species of regional level: Isoetes setacea and Sagittaria natans.

Sphagnum mosses (Sphagnaceae, Bryophyta) of mires Chefandzar and Masota in North Ossetia (Caucasus)

2018 ◽  
Vol 52 (2) ◽  
pp. 455-462 ◽  
Author(s):  
G. Ya. Doroshina ◽  
I. A. Nikolajev
Keyword(s):  
Plant Communities ◽  
The Other ◽  
North Caucasus ◽  
Sphagnum Mosses ◽  
Greater Caucasus ◽  
The North ◽  
First Time ◽  
North Ossetia

Sphagnum mires on the Greater Caucasus are rare, characterized by the presence of relict plant communities of glacial age and are in a stage of degradation. The study of Sphagnum of Chefandzar and Masota mires is carried out for the first time. Seven species of Sphagnum are recorded. Their distribution and frequency within the North Caucasus are analyzed. Sphagnum contortum, S. platyphyllum, S. russowii, S. squarrosum are recorded for the first time for the study area and for the flora of North Ossetia. The other mosses found in the study area are listed.

New associations of the class Molinio-Arrhenatheretea in the in Southern Nechernozemie region of Russia

2014 ◽  
pp. 3-12
Author(s):  
A. D. Bulokhov
Keyword(s):  
Loess Plateau ◽  
Plant Communities ◽  
Mineral Nitrogen ◽  
New Associations ◽  
Medicago Lupulina ◽  
Fallow Lands ◽  
Small Sites ◽  
First Time ◽  
Podzol Soils

3 new associations, distributed in the Southern Nechernozemie of Russia, are described for the first time with use of the Braun-Blanquet approach: Poo angustifoliae–Arrhenatheretum elatioris, Festuco pratensis–Leucanthemetum vulgaris, Trifolio ar­ven­si–Rumicetum thyrsiflori. The synecological amplitudes of humidity, acidity and soil richness by mineral nitrogen of the associations are defined. Communities of ass. Poo angustifoliae–Arrhenatheretum elatioris are distributed on the flat slopes of ravines on the dry, subacidic, grey wood loamy soils moderately rich by mineral nitrogen. Communities of ass. Festuco pratensis–Leucanthemetum vulgaris are distributed on fresh, subacidic, rather poor in mineral nitrogen grey and dark grey wood loamy soils on the fallow lands of various age within landscapes of loess plateau; on sod-podzolic loamy, sandy and subsandy soils within landscapes of fluvioglacial loamy and moraine-outwash plains. They can meet occasionally on grey wood loamy soils. Communities of the Potentilla argentea var. are distributed on grey and dark grey wood loamy soils on the fallow lands within landscapes of loess plateau. Communities of the Medicago lupulina var. are distributed on sod-podzolic loamy, sandy and subsandy subacidic, rather poor in mineral nitrogen soils on the fallow lands of various age. They may occur in the small sites on the continental meadows or along highways. Occasionally these plant communities can be found on grey wood loamy soils. Communities of ass. Trifolio arvensi–Rumicetum thyrsiflori are distributed on raised sites on gentle-wavy outwash or moraine-outwash plains on dry and moderately sour, poor by mineral nitrogen easily sandy and sandy podzol soils. For the estimation of a homotoneity of established syntaxa the index of homotoneity of H.Passarge (1979) is used. The ass. Poo angustifoliae–Arrhenatheretum elatioris is characteristic by the high homogenetic variability. Totally, association’s index of homotoneity is high — 0.52. The low index of a homotoneity is characteristic for аss. Festuco pratensis–Leucanthemetum vulgaris — 0.35, for the Potentilla argentea var. — 0.33 and Medicago lupulina var. — 0.44. Following associations have a low index of the homotoneity: аss. Trifolio arvensi–Rumicetum thyrsiflori — 0.33, as in subass. T.a.–R.th. typicum— 0.33, and in subass. T.a.–R.th. helichrysetosum arenarii — 0.44. Such low indexes of a homotoneity are characteristic for semiruderal and serial commu­nities.

scholarly journals Updated Incidence of Thyroid Cancer in the North East Region of Romania after 35 Years of Chernobyl Fallout. Is There a Link between?

Diagnostics ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 907
Author(s):  
Laura Teodoriu ◽  
Maria Christina Ungureanu ◽  
Letitia Leustean ◽  
Cristina Preda ◽  
Delia Ciobanu ◽  
...  
Keyword(s):  
Thyroid Cancer ◽  
Age Distribution ◽  
Age Groups ◽  
Chernobyl Fallout ◽  
Statistical Correlations ◽  
North East ◽  
The North ◽  
East Region ◽  
Radioactive Cloud ◽  
The Moment

Thyroid cancer (TC) represents a worldwide problem, the consistent growth of the incidence increment issues about management of risk factors and curative treatment. Updated statistical data are not complete in the North East region of Romania and need to be improved. Therefore, through this study, we aim to renew the existing data on thyroid cancer. We conducted a retrospective study covering a period of 10 years. Data were collected from a hospital information system (InfoWorld) between 2009 and 2019. Patients’ age groups were stratified in relation with the age at the moment of the Chernobyl event. A database was obtained (Microsoft Excel) and statistical correlations were applied. In the studied period, 1159 patients were diagnosed: 968 females and 191 males, distributed by region, with the highest addressability in Iasi (529), followed by neighboring counties. Age distribution displayed that most of the thyroid cancers were in the range 4060 years old (50.94%), followed by 60–80 years old (32.41%). Most patients were diagnosed with papillary carcinoma 63.10%, then follicular 14.7%, medullary 6.74% and undifferentiated 1.02%. Romania was in the vicinity of the radioactive cloud at Chernobyl fallout, so we must deliberate whether the increased incidence of thyroid cancer in the age group 40–60 years is associated with radiogenicity (iodine 131) given the fact that over has 35 years and the half-life of other radioisotopes like Caesium-137 and Strontium -90 is completed.

Sign in / Sign up

Export Citation Format

Share Document