Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Present Environment and Sustainable Development

2 Issues per year

Open Access
Online
ISSN
2284-7820
See all formats and pricing
More options …

Research on the Variation of Light Intensity Across Surfaces with Beech Seedlings Planted after the Application of the Progressive Felling Treatment

Ilie Covrig
  • Corresponding author
  • Associate Professor University of Agricultural Sciences and Veterinary Medicine,Cluj-Napoca, Romania
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mădălina Florina Presecan
Published Online: 2018-06-22 | DOI: https://doi.org/10.2478/pesd-2018-0024

Abstract

The research we have undertaken seeks to clarify some aspects concerning the specific characteristics of aforest microclimate. Spot measurements were carried out for 12 hours/day, on certain days that are typical for the period of vegetation and, respectively, for the period of vegetative rest. Measurements regarding the intensity of light were conducted across surfaces where progressive felling had been applied. The research findings about the light regime are presented below: 1. Surfaces subjected to the progressive felling treatment I - seeding fellings that create cut block sites in the mature stand canopy u. a. 74 B, UP III, Nirajul Mic, the Sovata Forestry. In these regeneration areas appear noticeable changes of the light regime, caused by the intensity of the fellings, the size of the cut block sites and the position of each cut block site sector. Thus, in clear cut block sites, having an elliptical shape of 0.5 H3 X 0.75 H*, in which seedlings have not yet been planted, the amount of light that reaches the soil surface, in relation to the open field solar radiation, is approx. ¼ - 1/3 in the eastern and southern sectors, 2/3 in the central sector and, respectively, 2/5 - ½ in the western and northern sectors. In the case of elliptical cut block sites, with diagonals of 1.0 H X 1.5 H, we have found some variations, in the sense that the eastern and the southern sectors receive, at ground surface, approx. 1/5 - 2/5 of the light from an unforested area, the central sector receives a little over 2/3, while the western and the northern sectors receive 4/5 -1/1 of the light from an unforested area, which is also the area with relatively maximum light availability. 2. Surfaces subjected to the progressive felling treatment II - fellings for expandingcut block sites UP VI, Valea Soveții, u.a 127,the Sovata Forestry. Thus, in an elliptical cut block site (1.0 H X 1.5 H) from UP VI, u.a. 127, at1 p.m.,when the sky was overcast, 50% of full light reached the eastern sector, 40% reached the southern sector, approx. 80-90% reached the center of the cut block site, and 75-85% of the amount of light from an unforested area reached the western and the northern sectors at soil surface level. Forest ecosystems are characterized by a great capacity of solar radiation absorption. As a result of selective processes of absorption, reflection and transmission, carried out at the level of the “active surface”, the light regime inside the forest presents a series of distinct features. Light intensity decreases from the top of the canopy to the ground. The decrease is accentuated in the canopy and much slower in the space underneath the canopy, all the way to the ground. Thus, while an average of 66-67% is recorded at the level of the canopy (2/3 of full light), underneath the canopy it reaches 9% (under 1/10 of full light) and only 6-7% of the light from an unforested area is recorded at ground level. Differences are found from one measurement point to another, within the same level, as a result of the foliage structure and the different thickness of the foliage mass located above the measurement point.

Keywords: light intensity; solar radiation absorption; cut block; lux meters; progressive treatment

References

  • Berbecel, O., ş. a., 1971: Agrometeorologie. Editura Ceres, Bucureşti.Google Scholar

  • Bodnariuc, N., Vădineanu, A., 1982: Ecologie generală. Editura Didactică şi pedagogică, Bucureşti.Google Scholar

  • Brega, P., 1992: Problematica regenerării amestecurilor de răşinoase şi fag. Revista Pădurilor, no. 1.Google Scholar

  • Chiriţă, C., D., 1974: Ecopedologia. Editura Academiei R. S. R.Google Scholar

  • Chiriţă, C., D., ş. a., 1977: Staţiuni forestiere. Editura Academiei R. S. R.Google Scholar

  • Chiriţă, C., D., Doniţă, N., Ivănescu, D., Lupe, I., Milescu, I., Stănescu, V., Vlad, I. ş. a., 1981: Pădurile României. Editura Academiei Republicii Socialiste România, Bucureşti.Google Scholar

  • Ciobanu, P., Bândiu, C., Vlonga, St., 1988: Contribuţii la cunoaşterea regimului ecologic şi punctelor de regenerare circulare în brădeto-făgete. Sesiunea decomunicări ştiinţifice a Facultăţii de Silvicultură şi Exploatări Forestiere din Braşov.Google Scholar

  • Constantinescu, N., 1963 (1973): Regenerarea arboretelor. Editura Agro-silvică. Bucureşti (Editura Ceres Bucureşti).Google Scholar

  • Covrig, I., 2000: Efectul microclimatic al unor lucrări silvotehnice asupra regenerării fagului. A IV-a Sesiune Ştiinţifică, Ecologia şi protecţia ecosistemelor, Universitatea Bacău - Secţia Biologie.Google Scholar

  • Covrig I, 2013, Regenerarea fagului, Editura Bioflux Cluj-Napoca, ISBN 978-606- 8191-59-1Google Scholar

  • Doniţă, N., Ceianu, I., Purcelean, Şt., Beldie, Al., 1977: Ecologie forestieră. Editura Ceres. Bucureşti.Google Scholar

  • Hanganu, C., 1963: Referitor la regenerarea făgetelor. Revista Pădurilor, no. 1.Google Scholar

  • Marcu, M., 1962: Cercetări asupra posibilităţilor de producere a îngheţurilor târzii şi timpurii, în scopul prevenirii efectului dăunător al acestora asupra culturilor forestiere. Lucrare ştiinţifică I. P. Braşov, vol. V.Google Scholar

  • Marcu, M., 1970: Cercetări privind regenerarea naturală în făgete, pădurea Warthe- Braşov. Buletin I. P. Braşov., vol. XII.Google Scholar

  • Milescu, I., Alexe, A., 1967: Fagul. Editura Agro-Silvică, Bucureşti.Google Scholar

  • Săvulescu, Al., Negruţiu, A., Creţianu, I., Văcaru, Gh., 1967: Cercetări privind regenerarea pe cale naturală a fagului în urma aplicării tăierilor rase în benzi la DREF Braşov. Buletinul Institutului Politehnic Braşov, seria B, vol. IX.Google Scholar

  • Teissier du Cros, E., ş. a., 1981: Le hetre. Institut National de la Recherche Agronomique, Departement des Recherches Forestieres.Google Scholar

  • ****, 1996: La gestion durable des forets: contribution de la recherche. Institut National de la Recherche Agronomique, no. 12Google Scholar

  • Vlonga, St., Fărcaş Cecilia, 1990: Cercetări privind lumina de care dispune seminţişul natural în făgetele montane parcurse cu prima tăiere succesivă, progresivă şi de transformare la grădinărit. Revista Pădurilor, nr. 3-4.Google Scholar

About the article

Published Online: 2018-06-22

Published in Print: 2018-06-01


Citation Information: Present Environment and Sustainable Development, Volume 12, Issue 1, Pages 309–317, ISSN (Online) 2284-7820, DOI: https://doi.org/10.2478/pesd-2018-0024.

Export Citation

© 2018 Ilie Covrig, published by Sciendo. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

Comments (0)

Please log in or register to comment.
Log in