The States of Decay of Woody Litter Determined by Relative Density

Christensen, O. M.

doi:10.2307/3544795

Cited by 31 publications

(20 citation statements)

References 7 publications

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“…6 Mean mass loss of twigs during decay with the function (y = 1.06 -0.22x) as percentage initial mass of single trees and litterbags. Mean values and standard deviation (bars) are shown X percentage mass remaining (%), t time (years), k decay constant, r 2 goodness of fit, P significance level (t-test) of the regression, t 95 time required for 95% mass loss (years) Christensen (1984) showed a direct relationship between mass loss and relative density. A prerequisite for this is that mass loss is only due to leaching and biochemical decay.…”

Section: Components Of the Decay Processmentioning

confidence: 99%

Decay dynamic of coarse and fine woody debris of a beech (Fagus sylvatica L.) forest in Central Germany

2009

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Decay rates of woody debris were estimated and used to model the decay of various diameters of branches and stems in a beech stand in Central Germany. In addition, use of wood density, volume and mass loss to quantitatively describe the degree of decay was tested. The mass loss during decay could be described by a simple exponential function. Under the presented climatic conditions, beech coarse woody debris (CWD) with a diameter [10 cm decays completely in about 35 years. In the first 8 years of decay the mass loss is determined by the decrease in wood density, and subsequently by the loss in volume. Estimation of wood density allows the first three of the four classes of decay to be distinguished, while trees in the last two decay classes could be distinguished using wood volume. Beech fine woody debris with a diameter between 1 and 10 cm decays within about 18 years. The litter fraction of \1 cm is part of the humus layer after 4 years. If there are goals for the amounts, types and dimensions of woody debris to be provided for conservation of biological biodiversity and other ecological functions in managed beech forests, this study offer indications for how long existing woody debris can meet its functions and how frequent new input of CWD is required.

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Section: Components Of the Decay Processmentioning

confidence: 99%

Decay dynamic of coarse and fine woody debris of a beech (Fagus sylvatica L.) forest in Central Germany

2009

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“…The relative density (g cm -3 ) of the sample (also known as bulk density or apparent density) was calculated as the dry weight of the sample divided by the volume of the drill hole or cube. The relative density is an adequate measure of the degree of decomposition of dead wood as long as the original shape and volume of the CWD is maintained (Yoneda 1975;Christensen 1984). An average value of water content (%) and relative density of three replicates was calculated for each CWD and used for data analyses.…”

Section: Samplingmentioning

confidence: 99%

Dynamics of physicochemical properties and occurrence of fungal fruit bodies during decomposition of coarse woody debris ofFagus crenata

Fukasawa

Osono

Takeda

2009

Journal of Forest Research

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The pattern of changes in the physicochemical properties of wood, and its relationship with fungal succession during decomposition of coarse woody debris (CWD) of beech (Fagus crenata Blume) were investigated. In total, 47 snags and 66 logs were assigned to a system of five decay classes, and were used for analysis of the decomposition process. The decomposition process consists of two phases characterized by their dominant organic chemical constituents. In the first phase (decay class 1-3), acid-unhydrolyzable residue (AUR) and holocellulose decreased simultaneously. In the second phase (decay class 3-5), holocellulose decayed selectively. Fruiting bodies of ten fungal taxa occurred frequently on decomposing logs and/or snags. These fungi were divided into early and late colonizers according to their occurrence during CWD decomposition. The relationship between fungal community composition and the physicochemical properties of CWD was analyzed by canonical correspondence analysis (CCA). According to the Monte Carlo permutation test, decay class, water content, and type of CWD (log or snag) significantly affected the fungal community structure. Our results suggested that white-rot basidiomycetes, especially Omphalotus guepiniformis, play a central role in the simultaneous decomposition of AUR and holocellulose in the first phase of decomposition. On the other hand, fungal taxa occurring in the second phase of decomposition may not be responsible for the decomposition of holocellulose. Three possible mechanisms of holocellulose decomposition and AUR accumulation in the second phase of decomposition are proposed and discussed.

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“…The trunk becomes decorticated and collapses against the ground. The wood becomes softened and cracked, and the density steadily decreases (Christensen 1984, Sollins et al 1987. All this together with the activities of decomposing organisms increases the moisture content.…”

Section: Community Structure and Developmentmentioning

confidence: 99%

Community structure and dynamics of wood-rotting Basidiomycetes on decomposing conifer trunks in northern Finland

Renvall¹

1995

Karstenia

407

338

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The States of Decay of Woody Litter Determined by Relative Density

Cited by 31 publications

References 7 publications

Decay dynamic of coarse and fine woody debris of a beech (Fagus sylvatica L.) forest in Central Germany

Decay dynamic of coarse and fine woody debris of a beech (Fagus sylvatica L.) forest in Central Germany

Dynamics of physicochemical properties and occurrence of fungal fruit bodies during decomposition of coarse woody debris ofFagus crenata

Community structure and dynamics of wood-rotting Basidiomycetes on decomposing conifer trunks in northern Finland

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