Weeds
Area of distribution and weediness of Galeopsis tetrahit L.
Object description Download GIS-layers
Authors:
Object specialist T.D. SokolovaGIS-specialist I.A. Budrevskaya
Date of creation:
21.06.2004.Scale:
1:20,000,000.Accuracy of map:
Map was created using maps of natural scale 1:10,000,000-1:80,000,000 and published data.Projection:
"Alber's Equal Area Conic" USSR, 9, 1001, 7, 100, 0, 44, 68, 0, 0.Basic contents:
Vector map. Main distribution area is shown by a polygon, while sporadic distribution is shown by points. Zone of weediness is shown by a polygon.Accuracy of classifier:
Within the weed distribution area, zones of main distribution, sporadic distribution and weediness are shown, where G. tetrahit is a pernicious weed.Mapping procedure:
Areas of main and sporadic distribution and weediness were established following an analysis of state maps and publications. The distribution area of G. tetrahit is based on the map of Hulten E. & Fries M. (1986). The boundaries of the zone of weediness were established according to Nikitin (1983) and Ulyanova (1998) and then specified according to data on species abundance and frequency of taken from below-mentioned references, adjusted to fit within the region of arable lands. Nikitin (1983) points out that G. tetrahit is a comparatively widespread weed in grain and tilled crops in the forest zone of the European former USSR, occurring more often in western regions. Ulyanova included G. tetrahit in the list of main weeds of crops in the European CIS (1998). According to Ulyanova et al. (1992), G. tetrahit is a pernicious weed in the Novgorod and Vologda Regions, where it is characterized by 75-100% frequency of occurrence and 3-5 points of abundance.Sources of data:
Aleksandrova, K.I., Barabash, G.I., Kamaeva, G.M., & Kamyshev, N.S. 1975. Keys to weeds of Central Chernozem area. Voronezh: Voronezh University, 276 p. (in Russian).Hulten, E. & Fries, M. 1986. Atlas of North European Vascular Plants, North of the Tropic of Cancer. Konigstein. V. 1-3. 1172 p.
Nikitin, V.V. 1983. Weed plants of the USSR flora. Leningrad: Nauka, 454 p. (in Russian).
Shlyakova, E.V. 1958. Species composition of field-weed plants of the Murmansk Region. In: Slodkevich, V.S., ed. News of Karelian and Kola branches of AS USSR. Petrozavodsk: Gosudarstvennoe izd-vo Karel'skoi ASSR, p. 131-137 (in Russian).
Tolmachev, A.I., ed. 1977. Flora of North-East of the European part of the USSR. Leningrad: Nauka. V. 4, 312 p. (in Russian).
Ulyanova, T.N. 1981. Weed plants in wheat of the USSR. In: Korovina, O.N., ed. Catalogue of VIR world collection. Issue 320. Leningrad: VIR, 68 p. (in Russian).
Ulyanova, T.N. 1998. Weed plants in the flora of Russia and other CIS states. St.-Petersburg: VIR, 344 p. (in Russian).
Ulyanova, T.N., Kondratenko, V.I., Ivanov, I.A. & Mal'kova, E.A. 1992. Weed plants of the Novgorod, Vologda and Arkhangelsk Regions. In: Erokhin, V.D., ed. Byulleten. VIR. Issue 229, p. 69-74 (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, 152 p. (in Russian).