Open AccessColonization by Pinus sylvestris of a former middle‐geolittoral habitat on the Umeälven river in northern Sweden, following river regulation for hydro‐electric power
Author(s) -
Grelsson Gunnel,
Nilsson Christer
Publication year - 1980
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1980.tb00718.x
Subject(s) - habitat , colonization , ecology , scots pine , hydrology (agriculture) , altitude (triangle) , vegetation (pathology) , geography , drainage basin , spring (device) , environmental science , physical geography , pinus <genus> , forestry , biology , geology , botany , medicine , geometry , geotechnical engineering , mathematics , pathology , mechanical engineering , cartography , engineering
The colonization by Scots pine of a former middle‐geolittoral habitat on the Umeälven river, northern Sweden, laid almost completely dry in 1958, was compared with that of a similar habitat, subject to natural changes in water‐level, on the Vindelälven river. The geographical position, altitude, exposition, slope and type of vegetation were similar at both sites. The percentage cover of field and bottom layers of the middle geolittoral are considered to have decreased after the fall in water‐level of the Umeälven river. The pines were dated by making annual ring counts. During the period 1962–67 a significant increase in pine colonization took place at the Umeälven site above the new, regulated, high‐water level. The tree densities (pines m ‐2 ) in 1978 on middle geolittoral sites of the Umeälven and Vindelälven rivers were 4.9 and 1.4, respectively.