Weeds
Area of distribution and weediness of Polygonum linicola (O. Schwarz) Sutul.
Object description Download GIS-layers
Authors:
Object specialist - I.N.Nadtochii,GIS-specialist - I.A.Budrevskaya.
Date of creation:
20.06.2007.Scale:
1:20 000 000.Accuracy of the map:
It is created on materials of maps of natural scale 1: 10 000 000 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 polygons (main distribution) and by dots (sporadic distribution). Zone of weediness is shown by polygon.Accuracy of the classifier:
Areas of main and sporadic distribution and weediness are shown. Within the weed area, the zone of its weediness is shown, 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 this species exceeded 50% with its abundance (projective cover) more than 15%.Method of map production:
Area and zone of weediness are shown according to the analysis of the open published maps and literature. A map compiled by Volkov (1935) is taken as a prototype. The prototype area has been corrected in the Northwest after Shishkin (1957) who indicated the species distribution in the central and southern areas of Leningrad Region only, and after Minyaev et al. (1981) in Izhora and Luga floristic areas (Leningrad Region). The data of Tolmachev (1976) and Shmidt (2005) have allowed extending the area eastward. Sporadic distribution of the species is given after Krylov (1930), Grossgeim (1949), Shishkin (1966), Tolmachev (1976), Shmidt (2005), and according to the Herbarium of the Vavilov All-Russian Institute of Plant Industry. The zone of weediness is allocated after the literature data with use of a map of arable lands. Criterion of its allocation is the indication of the weed in the literature as being a malicious weed in flax crops in the European part (Maevskii, 1954), being the main weed plant in flax crops in forest zone (Nikitin, 1983), having 3 points of abundance in flax and spring cereals in the Non-Chernozem Region (Korovina, 1982).Reference citations:
Grossgeim A.A. 1949. Keys to plants of the Caucasus. Moscow: Sovetskaya nauka, 747 p. (in Russian).Korovina O.N., ed. 1982. Weed plants of the Non-Chernozem Zone of Russia. In: Catalogue of VIR world collection. N 338. Leningrad: VIR, 117 p. (in Russian).
Krylov P., ed. 1930. Flora of Western Siberia. A guide to the identification of the western-Siberian plants. V. 4. Tomsk: Tomsk Branch of Russian Botanical Society, p. 718-993 (in Russian).
Maevskii P.F. 1954. Flora of middle belt of the European part of the USSR. Moscow & Leningrad: Selkhozgiz. 912 p. (in Russian).
Minyaev N.A., Orlova N.I., Shmidt V.M., eds. 1981. Keys to higher plants of the Northwest of the European part of the RSFSR (the Leningrad, Pskov and Novgorod regions). Leningrad: Leningrad University. 376 p. (in Russian).
Nikitin V.V. 1983. Weeds in the flora of the USSR. Leningrad: Nauka. 454 p. (in Russian).
Shishkin B.K., ed. 1957. Flora of the Leningrad Region. V. 2. Leningrad: Leningrad University, 244 p. (in Russian).
Shishkin B.K., ed. 1966. Keys to plants of Bashkir SSR. Moscow & Leningrad: Nauka, 496 p. (in Russian).
Shmidt V.M. 2005. Flora of Arkhangelsk Region. St.Petersburg: St.Petersburg University, 346 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).
Tolmachev A.I., ed. 1976. Flora of Northeast of the European part of the USSR. V. 2. Leningrad: Nauka, 316 p. (in Russian).
Volkov A.N., ed. 1935. Areas of distribution of the major weed plants in the USSR. Moscow & Leningrad: State Publishing House of Kolkhoz and Sovkhoz Literature, 153 p. (in Russian).