Production patterns of understory layers in several Galician (NW Spain) woodlands

Hernández, María del Pilar; Silva‐Pando, Francisco Javier; Jiménez, Mercedes Casal

doi:10.1016/s0378-1127(98)00253-9

Cited by 36 publications

(19 citation statements)

References 17 publications

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“…II). Gonzalez-Hernandez et al [11] also found canopy gap fraction to give the best correlation with ground vegetation biomass in Galician woodlands. There does not seem to be any difference between the native unmanaged birch forest and the unthinned larch plantations in the observed relationship between canopy gap fraction and ground vegetation biomass (Fig.…”

Section: Why Does the Ground Vegetation Biomass Change?mentioning

confidence: 91%

Biomass and composition of understory vegetation and the forest floor carbon stock across Siberian larch and mountain birch chronosequences in Iceland

Sigurðsson

Magnússon²,

Elmarsdóttir³

et al. 2005

Ann. For. Sci.

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-Changes in understory biomass, forest floor carbon (C) stock and vegetation composition were studied in six age-classes of Siberian larch (Larix sibirica) and two age-classes of native birch (Betula pubescens) in Iceland. The ground vegetation was less in the larch during the thicket stage and in the old-growth birch compared to a treeless pasture. Understory biomass was strongly related to canopy gap fraction across forest stands (P < 0.001), but not to soil pH or soil C/N ratio. Increased mass of dead wood and alterations in vegetation composition increased the forest floor C-stock of older forests. The forest floor had reached as high C-stock as the pasture's ground vegetation in ca. 50 years in the managed larch plantations and in ca. hundred years in the unmanaged birch forest. This study clearly shows the importance of which time-step is used when changes in forest floor C-stocks are computed for afforestation areas.Betula pubescens / carbon sequestration / woody debris / Larix sibirica / understory Résumé -Biomasse et composition de la végétation de sous-bois, et stock de carbone du sol dans une chronoséquence de mélèze de Sibérie et de bouleau pubescent en Islande. Nous avons étudié en Islande les modifications de biomasse, de composition floristique, et de stock de carbone en sous bois dans des peuplements de mélèze de Sibérie correspondant à 6 classes d'âge, et dans des peuplements de bouleau pubescent correspondant à deux classes d'âge. En comparaison avec une pâture non boisée, la végétation au sol était moins développée dans le peuplement de mélèze au stade gaulis et dans celui de bouleau mature. La biomasse au sol était fortement corrélée à la fraction de trouées dans l'ensemble des peuplements (p < 0,001) mais ni au pH du sol ou au rapport C/N. Une quantité croissante de bois mort et des changements dans la composition floristique étaient à l'origine de la croissance des stocks de carbone au sol dans les peuplement âgés. La surface du sol était aussi riche en carbone que la végétation d'une pâture dès l'âge de 50 ans dans les plantations gérées de mélèze atteignant 50 ans environ et dans des peuplements spontanés de bouleau à 100 ans. Cette étude montre clairement l'importance du choix du pas de temps pour l'estimation des stocks de carbone au sol de peuplements forestiers. séquestration de carbone / débris ligneux / sous-bois

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Section: Why Does the Ground Vegetation Biomass Change?mentioning

confidence: 91%

Biomass and composition of understory vegetation and the forest floor carbon stock across Siberian larch and mountain birch chronosequences in Iceland

Sigurðsson

Magnússon²,

Elmarsdóttir³

et al. 2005

Ann. For. Sci.

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“…Mo¿e to wynikaae z tego, i¿ przy ró¿nym zagêszczeniu drzew zwarcie koron mo¿e byae takie samo, co oecioele wi¹¿e siê z ich plastycznooeci¹ (Jagodziñski i Oleksyn 2009a, 2009b. Na przyk³ad w Hiszpanii Gonzalez-Hernandez et al (1998) stwierdzili znaczne zró¿nicowanie wartooeci biomasy rooelin runa (w przedziale 460 do 3860 kg/ha) w drzewostanach dêbowych, sosnowych i eukaliptusowych w zale¿nooeci od zwarcia koron, wykazuj¹c istotn¹ negatywn¹ korelacjê pomiêdzy stanem biomasy runa a zwarciem koron drzew. S¹ to wartooeci du¿o wy¿sze od tych, które uzyskano w badanym zbiorowisku gr¹do-wym Stellario holosteae-Carpinetum betuli na obszarze Nadleoenictwa Ró¿añsko.…”

Section: Data Zbioruunclassified

Seasonal changes in the understorey biomass of an oak-hornbeam forest Stellario holosteae-Carpinetum betuli

Rawlik¹,

Jagodziński²,

Janyszek³

2012

Forest Research Papers

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Abstract. We studied seasonal changes in the understorey biomass of an oak-hornbeam forest association Stellario holosteae-Carpinetum betuli. Samples were collected weekly during the most active period of growth of the herbaceous layer (April-May 2010), and every two weeks for the remainder of the growing season (June-October). Quadrates of 0.36 m 2 were sampled from 7-9 randomly selected locations within the plant community. The plants harvested were separated by species, then oven-dried and weighed. We found statistically significant differences in aboveground understorey biomass over the periods of biomass harvesting. For example, the average plant biomass (produced in 2010 and previous years) was smallest on March 20 th (40.6 kg/ha), whereas the biomass was greatest on May 15 th (393.8 kg/ha). The mean biomass of the understorey vegetation during spring was 324.1 kg/ha, while the mean biomass for summer and early autumn was 108 kg/ha. The smallest plant biomass (produced during 2010) was on March 20 th (18.3 kg/ha) and the largest on May 15 th (378.4 kg/ha). Only a few herbaceous species dominated the total community biomass production. For example, from March 20 th to May 29 th the biomass of Anemone nemorosa was the highest at ca. 74% of total understorey herbaceous plant biomass, while Ficaria verna was second with 8%. During the next harvesting period (June-October) Galeobdolon luteum and Galium odoratum comprised 53.2% of total plant biomass harvested. It is evident that the highest biomass production is during the spring when the geophytes develop.

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“…It provides food and habitat for the fauna (González-Hernández et al 1998;Yanai et al 1998), protection from depredation and sun exposure to the regeneration (Kunstler et al 2006), and it constitutes a major component of forest biodiversity (Kerns and Ohmann 2004;Aubin et al 2009). It also competes for soil resources with the overstory trees (Coll et al 2003(Coll et al , 2004 and represents, in some regions, a fire hazard (Fernandes and Rigolot 2007).…”

Section: Introductionmentioning

confidence: 99%

Predicting understory maximum shrubs cover using altitude and overstory basal area in different Mediterranean forests

et al. 2010

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In some areas of the Mediterranean basin where the understory stratum represents a critical fire hazard, managing the canopy cover to control the understory shrubby vegetation is an ecological alternative to the current mechanical management techniques. In this study, we determine the relationship between the overstory basal area and the cover of the understory shrubby vegetation for different dominant canopy species (Pinaceae and Fagaceae species) along a wide altitudinal gradient in the province of Catalonia (Spain). Analyses were conducted using data from the Spanish National Forest Inventory. At the regional scale, when all stands are analysed together, a strong negative relationship between mean shrub cover and site elevation was found. Among the Pinaceae species, we found fairly good relationships between stand basal area and the maximum development of the shrub stratum for species located at intermediate elevations (Pinus nigra, Pinus sylvestris). However, at the extremes of the elevationclimatic gradient (Pinus halepensis and Pinus uncinata stands), stand basal area explained very little of the shrub cover variation probably because microsite and topographic factors override its effect. Among the Fagaceae species, a negative relationship between basal area and the maximum development of the shrub stratum was found in Quercus humilis and Fagus sylvatica dominated stands but not in Quercus ilex. This can be due to the particular canopy structure and management history of Q. ilex stands. In conclusion, our study revealed a marked effect of the tree layer composition and the environment on the relationship between the development of the understory and overstory tree structure. More fine-grained studies are needed to provide forest managers with more detailed information about the relationship between these two forest strata.

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Production patterns of understory layers in several Galician (NW Spain) woodlands

Cited by 36 publications

References 17 publications

Biomass and composition of understory vegetation and the forest floor carbon stock across Siberian larch and mountain birch chronosequences in Iceland

Biomass and composition of understory vegetation and the forest floor carbon stock across Siberian larch and mountain birch chronosequences in Iceland

Seasonal changes in the understorey biomass of an oak-hornbeam forest Stellario holosteae-Carpinetum betuli

Predicting understory maximum shrubs cover using altitude and overstory basal area in different Mediterranean forests

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