Weeds

Area of distribution and harmfulness of Spergula arvensis L.

Object description Download GIS-layers

Authors:

Object specialist - T. D. Sokolova, GIS-specialist - I.A.Budrevskaja

Date of creation:

15.12.2003

Scale:

1:20 000 000

Accuracy of the map:

Created using maps of natural scale 1:80 000 000 and larger and on literature references.

Projection:

"Alber's Equal Area Conic" USSR, 9, 1001, 7, 100, 0, 44, 68, 0, 0

Basic contents:

Vector map. Area is shown by polygons (basic distribution) and by points (sporadic distribution). Zone of weediness are shown by polygons.

Accuracy of classifier:

Area of basic distribution, sporadic distribution and zones of harmfulness were established according to an analysis of open-published maps and literature. The area of Spergula arvensis is based on the map of Hulten & Fries (1986). Boundaries for the zones of weediness were determined according to Nikitin (1983) and adjusted with the boundaries of the Map of Arable Lands.

Method of map production:

Published literature was reviewed, including Atlases, monographs and papers. Occurrence data were obtained from herbarium specimens, floras, monographs and papers. Data were then compiled through scanning and geo-referencing to develop a composite vector map. The biologist, together with the GIS specialist, drew a composite weed distribution area based on compiled data.

Reference citations:

Dorogostayskaya E.V. 1972. Weed plants of the Far North of the USSR. Leningrad: Nauka. 65, 74 pp.
Hulten E., Fries M. 1986. Atlas of North European Vascular Plants, North of the Tropic of Cancer: Konigstein. V.1-3: 1172.
Koroljeva, I.E., Vilchevskaya, E.V, Ruhovich, D.I. 2003. Digital Arable Land Map. Laboratory of Soil Information of the Dokuchaev Soil Institute, Moscow.
Nikitin V.V. 1983. Weed plants of the flora of the USSR. Leningrad: Nauka. 48-54 pp.
Tolmachev A.I. 1976. Flora of Northeast of the European part of the USSR. Leningrad: Nauka. V. 2: 224.
Ulyanova T.N. 1983. Weed plants of the Soviet Far East. In: The catalogue of world collection of VIR. Issue 374. Leningrad: VIR. 20 pp.

Right and copyright:

Copyright on this map and description belongs to their authors.