Search results for "archaeophytes"
showing 4 items of 4 documents
Crop density rather than ruderal plants explains the response of ancient segetal weeds
2018
AbstractThe influence of ruderal species and crop density on ancient segetal weeds was examined. The experiment was carried out on experimental plots with three different sewing densities of winter triticale. Weeding of ruderal taxa was applied on half of the plots to explore the relation between segetal and ruderal weeds. Variation in species composition by environmental variables was analysed by running Redundancy Analysis (RDA) combined with performing forward selection and variation partitioning for “weeding” and “crop density” as explanatory variables. Additionally, the effect of crop density and weeding was tested separately for segetal and ruderal species along the seasons with the u…
A report on the conservation status of segetal weeds in Tajikistan
2014
Summary Intensification of agriculture has significantly diminished the populations of segetal weeds worldwide in recent decades. Remarkable changes to the entire flora and vegetation of man-made habitats are being observed in agroecosystems. The present study analyses, for the first time, the threat status of segetal weeds in Tajikistan. A group of 871 weed species were evaluated against IUCN criteria. The assessment of threat status revealed that 214 weed taxa have to be regarded as threatened in Tajikistan, including 18 endemic and four subendemic plants. Five species have been classified as extinct, 27 as critically endangered, 27 as endangered, 39 as vulnerable, 34 as near threatened a…
Algunas citas de interés para la flora valenciana (norte de Alicante)
2008
Se presentan algunos resultados de una catalogación florística realizada en la Estación Biológica de Torretes-Font Roja, situada en las inmediaciones del Parque Natural del Carrascar de la Font Roja (Ibi-Alcoy, Alicante). De los más de 200 táxones catalogados destacamos por su rareza en la Comunidad Valenciana: Linaria repens (L.) Mill. subsp. blanca (Pau) Rivas Godoy & Borja, cuya presencia en la provincia de Alicante se limita a unas pocas citas en las próximas Sierras de Castalla y del Maigmó; Gypsophila pilosa Hudson, arqueófito muy raro ligado a los cultivos tradicionales de cereal y a los consiguientes barbechos, cuyas citas recientes son casi nulas, y Prunus acida C. Koch, especie ar…
Archéophytes et néophytes.Pour une nouvelle détermination des marqueurs polliniques de l'anthropisation. Le cas des milieux cultivés et rudéraux de F…
2007
297p. de synthèse, annexes p.299-414, 15 articles en soumission Diplôme : Dr. d'Universite