<strong/>Light, temperature and soil moisture regimes following gap formation in a semi-natural beech-dominated forest in Denmark

Eva Ritter, Lise Dalsgaard, Katrina S. Einhorn

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

174 Citationer (Scopus)

Resumé

A renewed interest in natural gap dynamics has developed from a recent focus on sustainable forestry in Europe. To improve our understanding of the role of a canopy opening on the physical environment in a natural forest, a case study was undertaken in and around a gap in a semi-natural, beech-dominated (Fagus sylvatica L.) forest. Spatial and temporal variations in photosynthetically active irradiance (IP), soil and air temperature (TS and TA) and soil water content (SWC) were studied until the third growing season after natural formation of the gap.
IP was highest in the northern part of the gap and in the adjacent forest, particularly around mid-summer and on sunny days, when IP was predominantly direct. Total IP in the southern part of the gap and along gap edges declined by about 19.6% from the first to the second year after gap formation, possibly due to growth of canopy and sub-canopy trees. Maximum and mean TS were generally highest in the southern central part of the gap, and in late spring and summer also under the closed canopy east of the gap. The insulating effect of dense regeneration could to some extent explain the spatial variation of TS, though this was not tested directly. SWC in the gap was near field capacity and generally higher than that under the closed canopy during summer. A decrease in SWC from the first to the second year after gap formation may have been attributed to released edge trees, although water use by the dense regeneration could not be ruled out. In general, the effect of this small irregular gap on light, soil and air temperature, and soil moisture was influenced by the considerable microsite variation. Furthermore, growth of regeneration and edge trees, resulting in increased interception, shading and water extraction by roots, may have modified the gap effect seen as early as the second year after gap formation.
OriginalsprogEngelsk
TidsskriftForest Ecology and Management
Vol/bind206
Sider (fra-til)15-33
Antal sider19
ISSN0378-1127
StatusUdgivet - 2005
Udgivet eksterntJa

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soil water regimes
Denmark
Fagus
canopy
soil water content
regeneration
soil water
water content
temperature
soil temperature
spatial variation
summer
air temperature
gap dynamics
sustainable forestry
field capacity
Fagus sylvatica
shading
interception
water use

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title = "Light, temperature and soil moisture regimes following gap formation in a semi-natural beech-dominated forest in Denmark",
abstract = "A renewed interest in natural gap dynamics has developed from a recent focus on sustainable forestry in Europe. To improve our understanding of the role of a canopy opening on the physical environment in a natural forest, a case study was undertaken in and around a gap in a semi-natural, beech-dominated (Fagus sylvatica L.) forest. Spatial and temporal variations in photosynthetically active irradiance (IP), soil and air temperature (TS and TA) and soil water content (SWC) were studied until the third growing season after natural formation of the gap.IP was highest in the northern part of the gap and in the adjacent forest, particularly around mid-summer and on sunny days, when IP was predominantly direct. Total IP in the southern part of the gap and along gap edges declined by about 19.6{\%} from the first to the second year after gap formation, possibly due to growth of canopy and sub-canopy trees. Maximum and mean TS were generally highest in the southern central part of the gap, and in late spring and summer also under the closed canopy east of the gap. The insulating effect of dense regeneration could to some extent explain the spatial variation of TS, though this was not tested directly. SWC in the gap was near field capacity and generally higher than that under the closed canopy during summer. A decrease in SWC from the first to the second year after gap formation may have been attributed to released edge trees, although water use by the dense regeneration could not be ruled out. In general, the effect of this small irregular gap on light, soil and air temperature, and soil moisture was influenced by the considerable microsite variation. Furthermore, growth of regeneration and edge trees, resulting in increased interception, shading and water extraction by roots, may have modified the gap effect seen as early as the second year after gap formation.",
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<strong/>Light, temperature and soil moisture regimes following gap formation in a semi-natural beech-dominated forest in Denmark. / Ritter, Eva; Dalsgaard, Lise; S. Einhorn, Katrina.

I: Forest Ecology and Management, Bind 206, 2005, s. 15-33.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Light, temperature and soil moisture regimes following gap formation in a semi-natural beech-dominated forest in Denmark

AU - Ritter, Eva

AU - Dalsgaard, Lise

AU - S. Einhorn, Katrina

PY - 2005

Y1 - 2005

N2 - A renewed interest in natural gap dynamics has developed from a recent focus on sustainable forestry in Europe. To improve our understanding of the role of a canopy opening on the physical environment in a natural forest, a case study was undertaken in and around a gap in a semi-natural, beech-dominated (Fagus sylvatica L.) forest. Spatial and temporal variations in photosynthetically active irradiance (IP), soil and air temperature (TS and TA) and soil water content (SWC) were studied until the third growing season after natural formation of the gap.IP was highest in the northern part of the gap and in the adjacent forest, particularly around mid-summer and on sunny days, when IP was predominantly direct. Total IP in the southern part of the gap and along gap edges declined by about 19.6% from the first to the second year after gap formation, possibly due to growth of canopy and sub-canopy trees. Maximum and mean TS were generally highest in the southern central part of the gap, and in late spring and summer also under the closed canopy east of the gap. The insulating effect of dense regeneration could to some extent explain the spatial variation of TS, though this was not tested directly. SWC in the gap was near field capacity and generally higher than that under the closed canopy during summer. A decrease in SWC from the first to the second year after gap formation may have been attributed to released edge trees, although water use by the dense regeneration could not be ruled out. In general, the effect of this small irregular gap on light, soil and air temperature, and soil moisture was influenced by the considerable microsite variation. Furthermore, growth of regeneration and edge trees, resulting in increased interception, shading and water extraction by roots, may have modified the gap effect seen as early as the second year after gap formation.

AB - A renewed interest in natural gap dynamics has developed from a recent focus on sustainable forestry in Europe. To improve our understanding of the role of a canopy opening on the physical environment in a natural forest, a case study was undertaken in and around a gap in a semi-natural, beech-dominated (Fagus sylvatica L.) forest. Spatial and temporal variations in photosynthetically active irradiance (IP), soil and air temperature (TS and TA) and soil water content (SWC) were studied until the third growing season after natural formation of the gap.IP was highest in the northern part of the gap and in the adjacent forest, particularly around mid-summer and on sunny days, when IP was predominantly direct. Total IP in the southern part of the gap and along gap edges declined by about 19.6% from the first to the second year after gap formation, possibly due to growth of canopy and sub-canopy trees. Maximum and mean TS were generally highest in the southern central part of the gap, and in late spring and summer also under the closed canopy east of the gap. The insulating effect of dense regeneration could to some extent explain the spatial variation of TS, though this was not tested directly. SWC in the gap was near field capacity and generally higher than that under the closed canopy during summer. A decrease in SWC from the first to the second year after gap formation may have been attributed to released edge trees, although water use by the dense regeneration could not be ruled out. In general, the effect of this small irregular gap on light, soil and air temperature, and soil moisture was influenced by the considerable microsite variation. Furthermore, growth of regeneration and edge trees, resulting in increased interception, shading and water extraction by roots, may have modified the gap effect seen as early as the second year after gap formation.

M3 - Journal article

VL - 206

SP - 15

EP - 33

JO - Forest Ecology and Management

JF - Forest Ecology and Management

SN - 0378-1127

ER -