Open AccessDYNAMICS OF ILLUMINANCE INCIDENT ON THE LANW SURFACE IN THE SHADE OF VARIOUS WOODY SPECIES
Author(s) -
Л. А. ГречушкинаСухорукова
Publication year - 2019
Publication title -
ûg rossii: èkologiâ, razvitie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.224
H-Index - 4
eISSN - 2413-0958
pISSN - 1992-1098
DOI - 10.18470/1992-1098-2019-2-48-58
Subject(s) - lawn , illuminance , crown (dentistry) , rlc circuit , mathematics , botany , horticulture , physics , biology , optics , materials science , quantum mechanics , voltage , composite material , capacitor
Aim . This paper is aimed at studying the relative light conditions (RLC) for lawns in the crown shade of light‐requiring and shade‐tolerant trees from the landscaping sites of Stavropol. Methods . The illuminance incident on the lawn surface was measured using a TKA‐LUX light meter from 7 a.m. to 5 p.m., every two hours. Results . It is shown that lawns under the crowns of light‐requiring tree species (Larix sibirica), received the highest RLC. During three calendar periods (22.05–15.06–18.09.2017, from 7 a.m. to 5 p.m.), its value amounted to 8.2‐9.2% (9.2% – at 1 p.m.); 4.6‐6.8% (6.8%); 7.0‐12.9% (12.9%). The projective cover of the lawns reached 75‐90%. In case of Betula pendula, the RLC values were as follows: 2.6‐3.7% (3.7%); 1.9‐3.2% (3.0%); 3.6‐5.7% (5.6%), with the projective cover amounting to 75‐90%. Under the crowns of shade‐tolerant species, Abies nordmanniana, the RLC values reached 1.0‐1.5% (1.0%), 0.6‐1.5% (0.6%), 0.7‐3.0 (0.7%), with the projective cover of lawns amounting to 10‐25%. For Aesculus hip‐ pocastanum, these values were equal to 0.6‐0.8% (0.6%); 0.6‐0.8% (0.6%); 9.0‐11.5% (11.2%), with dead patches being frequently formed. Projective cover values for shaded lawns correlate with the RLC value (r = 0.89). Conclusions . Under present conditions, ground covers consisting of Vinca minor shrubs and Hedera helix vines can be used in urban greening for intensively shaded sites.