Light environment and carbon gain of understory herbs associated with sunflecks in a warm temperate deciduous forest in Japan

Hiroshi Koizumi, Yasuyuki Oshima

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Seasonal variation in the light environment on the forest floor of a deciduous forest was investigated with special reference to sunflecks. Diurnal variations and seasonal changes in frequency and irradiation period of the sunflecks (sunfleck duration) were measured. The hourly total sunfleck duration varied seasonally; that is, 30-40 min in spring and autumn and about 15-20 min in summer. There was no large variation in the hourly sunfleck duration during daytime hours (from 9.00 to 15.00 h). The emergence frequency of sunflecks was 1.3-4.8 per h with two peaks, one in the morning and one in the afternoon. The mean duration of a sunfleck, however, showed a characteristic daily pattern with a peak around noon. Sunfleck duration was long around noon, ranging from 12 to 18 min, and short around 10.00 and 14.00 h, ranging from 6 to 10 min. Using the light photosynthesis curves of Pyrola japonica and Syneilesis palmata (Koizumi & Oshima 1985), the contribution of sunflecks to the dry matter production of these understory species was evaluated. It was shown that the sunflecks contributed 7-10% of the carbon gain in S. palmata, but only 2-3% of that in P. japonica.

Original languageEnglish
Pages (from-to)135-142
Number of pages8
JournalEcological Research
Volume8
Issue number2
DOIs
Publication statusPublished - 1993 Aug
Externally publishedYes

Fingerprint

temperate forests
temperate forest
deciduous forests
deciduous forest
understory
herb
herbs
Syneilesis palmata
Japan
duration
carbon
forest floor
diurnal variation
dry matter
photosynthesis
irradiation
seasonal variation
autumn
summer
forest litter

Keywords

  • carbon gain
  • deciduous forest
  • Pyrola japonica
  • sunflecks
  • Syneilesis palmata

ASJC Scopus subject areas

  • Ecology

Cite this

Light environment and carbon gain of understory herbs associated with sunflecks in a warm temperate deciduous forest in Japan. / Koizumi, Hiroshi; Oshima, Yasuyuki.

In: Ecological Research, Vol. 8, No. 2, 08.1993, p. 135-142.

Research output: Contribution to journalArticle

@article{b2f72af2f96940d5907273b292a5c523,
title = "Light environment and carbon gain of understory herbs associated with sunflecks in a warm temperate deciduous forest in Japan",
abstract = "Seasonal variation in the light environment on the forest floor of a deciduous forest was investigated with special reference to sunflecks. Diurnal variations and seasonal changes in frequency and irradiation period of the sunflecks (sunfleck duration) were measured. The hourly total sunfleck duration varied seasonally; that is, 30-40 min in spring and autumn and about 15-20 min in summer. There was no large variation in the hourly sunfleck duration during daytime hours (from 9.00 to 15.00 h). The emergence frequency of sunflecks was 1.3-4.8 per h with two peaks, one in the morning and one in the afternoon. The mean duration of a sunfleck, however, showed a characteristic daily pattern with a peak around noon. Sunfleck duration was long around noon, ranging from 12 to 18 min, and short around 10.00 and 14.00 h, ranging from 6 to 10 min. Using the light photosynthesis curves of Pyrola japonica and Syneilesis palmata (Koizumi & Oshima 1985), the contribution of sunflecks to the dry matter production of these understory species was evaluated. It was shown that the sunflecks contributed 7-10{\%} of the carbon gain in S. palmata, but only 2-3{\%} of that in P. japonica.",
keywords = "carbon gain, deciduous forest, Pyrola japonica, sunflecks, Syneilesis palmata",
author = "Hiroshi Koizumi and Yasuyuki Oshima",
year = "1993",
month = "8",
doi = "10.1007/BF02348525",
language = "English",
volume = "8",
pages = "135--142",
journal = "Ecological Research",
issn = "0912-3814",
publisher = "Springer Japan",
number = "2",

}

TY - JOUR

T1 - Light environment and carbon gain of understory herbs associated with sunflecks in a warm temperate deciduous forest in Japan

AU - Koizumi, Hiroshi

AU - Oshima, Yasuyuki

PY - 1993/8

Y1 - 1993/8

N2 - Seasonal variation in the light environment on the forest floor of a deciduous forest was investigated with special reference to sunflecks. Diurnal variations and seasonal changes in frequency and irradiation period of the sunflecks (sunfleck duration) were measured. The hourly total sunfleck duration varied seasonally; that is, 30-40 min in spring and autumn and about 15-20 min in summer. There was no large variation in the hourly sunfleck duration during daytime hours (from 9.00 to 15.00 h). The emergence frequency of sunflecks was 1.3-4.8 per h with two peaks, one in the morning and one in the afternoon. The mean duration of a sunfleck, however, showed a characteristic daily pattern with a peak around noon. Sunfleck duration was long around noon, ranging from 12 to 18 min, and short around 10.00 and 14.00 h, ranging from 6 to 10 min. Using the light photosynthesis curves of Pyrola japonica and Syneilesis palmata (Koizumi & Oshima 1985), the contribution of sunflecks to the dry matter production of these understory species was evaluated. It was shown that the sunflecks contributed 7-10% of the carbon gain in S. palmata, but only 2-3% of that in P. japonica.

AB - Seasonal variation in the light environment on the forest floor of a deciduous forest was investigated with special reference to sunflecks. Diurnal variations and seasonal changes in frequency and irradiation period of the sunflecks (sunfleck duration) were measured. The hourly total sunfleck duration varied seasonally; that is, 30-40 min in spring and autumn and about 15-20 min in summer. There was no large variation in the hourly sunfleck duration during daytime hours (from 9.00 to 15.00 h). The emergence frequency of sunflecks was 1.3-4.8 per h with two peaks, one in the morning and one in the afternoon. The mean duration of a sunfleck, however, showed a characteristic daily pattern with a peak around noon. Sunfleck duration was long around noon, ranging from 12 to 18 min, and short around 10.00 and 14.00 h, ranging from 6 to 10 min. Using the light photosynthesis curves of Pyrola japonica and Syneilesis palmata (Koizumi & Oshima 1985), the contribution of sunflecks to the dry matter production of these understory species was evaluated. It was shown that the sunflecks contributed 7-10% of the carbon gain in S. palmata, but only 2-3% of that in P. japonica.

KW - carbon gain

KW - deciduous forest

KW - Pyrola japonica

KW - sunflecks

KW - Syneilesis palmata

UR - http://www.scopus.com/inward/record.url?scp=0027878435&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027878435&partnerID=8YFLogxK

U2 - 10.1007/BF02348525

DO - 10.1007/BF02348525

M3 - Article

AN - SCOPUS:0027878435

VL - 8

SP - 135

EP - 142

JO - Ecological Research

JF - Ecological Research

SN - 0912-3814

IS - 2

ER -