Weeds
Area of distribution of Sherardia arvensis L.
Object description Download GIS-layers
Authors:
Object specialist - I.N.Nadtochii,GIS-specialist - I.A.Budrevskaya.
Date of creation:
20.05.2007.Scale:
1:20 000 000.Accuracy of the map:
It is created on materials of maps of natural scale 1: 80 000 000 and larger and on literature data.Projection:
"Alber's Equal Area Conic for the USSR", 9, 1001, 7, 100, 0, 44, 68, 0, 0.Basic content:
Vector map. Area of distribution is shown by polygon (main distribution) and by dots (sporadic distribution).Accuracy of the classifier:
Area of main and sporadic distribution of the weed is shown. Zone of its weediness cannot be established by criteria of occurrence (% of fields where this species is found) and abundance (expressed as projective cover of this species in the field (in % to the field area) (Tanskii et al., 1998), i.e.; where the occurrence of a species exceeds 50% with its abundance (projective cover) more than 15%.Method of map production:
The area is established according to the analysis of the open published maps and literature. A map compiled by Hulten E. & Fries M. (1986) is taken as a prototype. Original area of the weed is not changed, being confirmed by reference citations. A few dots of sporadic distribution are added after Maevskii (1954) and Tsvelev (2000). Zone of weediness is not shown as the species weediness does not reach established criteria (see Accuracy of the classifier); S. arvensis meets occasionally in crops, orchards, vineyards (in Crimea), tea plantations (in the Caucasus), being also a ruderal weed (Nikitin, 1983).Reference citations:
Hulten E. & Fries M. 1986. Atlas of North European Vascular Plants, North of the Tropic of Cancer: Konigstein. V. 1-3. 1172 p.Maevskii P.F. 1954. Flora of middle belt of the European part of the USSR. Moscow & Leningrad: Selkhozgiz. 912 p. (in Russian).
Nikitin V.V. 1983. Weeds in the flora of the USSR. Leningrad: Nauka, 454 p. (in Russian).
Tanskii V.I., Levitin M.M., Ishkova T.I. & Kondratenko V.I. 1998. Phytosanitary diagnostics in integrated management of cereals. In: Novozhilov K.V., ed. Compendium of methodical recommendations in plant protection. St. Petersburg: VIZR, p. 5-55. (in Russian).
Tsvelev N.N. 2000. Keys to the vascular plants of Northwest Russia (Leningrad, Pskov and Novgorod Regions). Saint-Petersburg: SPbSCPA press. 781 p. (in Russian).