Effect of soil preparation of boreal spruce forest on air and soil temperature conditions in forest regeneration areas.

Show full item record



Permalink

http://hdl.handle.net/10138/27260

Citation

Acta Forestalia Fennica. 1994. 244: 1-56.

Title: Effect of soil preparation of boreal spruce forest on air and soil temperature conditions in forest regeneration areas.
Author: Kubin, Eero; Kemppainen, Lauri
Publisher: The Society of Forestry in Finland - The Finnish Forest Research Institute
Date: 1994
Language: en
ISSN: 0001-5636
URI: http://hdl.handle.net/10138/27260
Abstract: The effect of scarification, ploughing and cross-directional plouhing on temperature conditions in the soil and adjacent air layer have been studied during 11 consecutive growth periods by using an unprepared clear-cut area as a control site. The maximum and minimum temperatures were measured daily in the summer months, and other temperature observations were made at four-hour intervals by means of a Grant measuring instrument. The development of the seedling stand was also followed in order to determine its shading effect on the soil surface. Soil preparation decreased the daily temperature amplitude of the air at the height of 10 cm. The maximum temperatures on sunny days were lower in the tilts of the ploughed and in the humps of the cross-directional ploughed sites compared with the unprepared area. Correspondingly, the night temperatures were higher and so the soil preparation considerably reduced the risk of night frost. In the soil at the depth of 5 cm, soil preparation increased daytime temperatures and reduced night temperatures compared with unprepared area. The maximum increase in monthly mean temperatures was almost 5 °C, and the daily variation in the surface parts of the tilts and humps increased so that excessively high temperatures for the optimal growth of the root system were measured from time to time. The temperature also rose at the depths of 50 and 100 cm. Soil preparation also increased the cumulative temperature sum. The highest sums accumulated during the summer months were recorded at the depth of 5 cm in the humps of cross-directional ploughed area (1127 dd.) and in the tilts of the ploughed area (1106 dd.), while the corresponding figure in the unprepared soil was 718 dd. At the height of 10 cm the highest temperature sum was 1020 dd. in the hump, the corresponding figure in the unprepared area being 925 dd. The incidence of high temperature amplitudes and percentage of high temperatures at the depth of 5 cm decreased most rapidly in the humps of cross-directional ploughed area and in the ploughing tilts towards the end of the measurement period. The decrease was attributed principally to the compressing of tilts, the ground vegetation succession and the growth of seedlings. The mean summer temperature in the unprepared area was lower than in the prepared area and the difference did not diminish during the period studied. The increase in temperature brought about by soil preparation thus lasts at least more than 10 years.
Subject: kuusi
Picea abies
boreaaliset alueet
metsämaa
maaperä
lämpötila
maanmuokkaus
maan lämpötila
taimikot
boreal forests
regeneration
site preparation
soil temperature
air temperature
boreal spruce forest, forest regeneration, soil preparation, soil temperature, air temperature


Files in this item

Total number of downloads: Loading...

Files Size Format View
244-1994.pdf 23.96Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record