Changes in the composition of humus profiles near the trunk base of an oak tree (Quercus petraea (Mattus.) Liebl.)

Deschaseaux, Anne; Ponge, Jean‐François

doi:10.1016/s1164-5563(01)01064-0

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…2). This was due to changes in the composition of humus profiles, with more holorganic faecal material accumulated near the trunk base, as this has been already observed under oak by Deschaseaux and Ponge [13]. The positive influence of full-grown beech (compared to the pole stage, i.e.…”

Section: Discussionmentioning

confidence: 58%

“…Countings were summed up for each category then transformed into percentages of solid matter. Due to the sandy nature of the soil, some poorly structured hemorganic or mineral assemblages were dispersed, forming a muddy deposit at the bottom of plastic tubes which were used for the fixation and transport of humus layers, contrary to other studies using the same method [7,13,29]. Such fine material without any indication of coherent structure was thus discarded in the analysis.…”

Section: Sampling Proceduresmentioning

confidence: 99%

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The heterogeneity of humus components in a virgin beech forest

Patzel¹,

Ponge²

2001

European Journal of Soil Biology

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A non-random sampling design allowed to distinguish within a virgin beech ecosystem two main components of humus profile heterogeneity. The stratification of the profile into horizons reflects changes in the composition of the soil/litter matrix occurring under the influence of the anisotropic deposition of leaf and wood litter and the stratified occurrence of soil organisms (roots, microbes, animals). The horizontal heterogeneity is mainly influenced by changes in vegetation, in particular the decreasing influence of beech (and the increasing influence of ground vegetation) when passing from the tree trunk base, where the influence of the tree reaches a maximum, to the centre of adjacent gaps where the influence of beech is replaced by that of another vegetation. The use of multivariate methods, used for description rather than for modelling, is suggested to be the best procedure for understanding patterns underlying heterogeneity without a priori assumptions.

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Section: Discussionmentioning

confidence: 58%

Section: Sampling Proceduresmentioning

confidence: 99%

The heterogeneity of humus components in a virgin beech forest

Patzel¹,

Ponge²

2001

European Journal of Soil Biology

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“…Tree trunks are recognized as having a strong influence on humus form resulting in (i) an increase of organic layer thickness and (ii) a decrease of A horizon pH [8,23]. With regard to the ordination of "stumps" within the factorial plan 1-2 of the MCA, this influence seems to endure after tree felling.…”

Section: Humus Forms Variabilitymentioning

confidence: 99%

Variability and heterogeneity of humus forms at stand level: Comparison between pure beech and mixed beech-hornbeam forest

et al. 2006

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-We investigate the influence of tree canopy composition on humus form variability and heterogeneity by comparing a pure beech stand and a mixed beech-hornbeam one (70% beech and 30% hornbeam). Macro-morphological humus form descriptors were recorded using a spatially explicit sample design at stand level. Leaf litter composition and light intensity accounting for stand management as well as bulk density for harvesting practices (soil compaction) were also recorded. A multiple correspondence analysis (MCA) and geostatistics were used to assess humus form variability and heterogeneity, as well as the spatial correlation between stand characteristics and humus forms. Humus form variability and activity were greater under the mixed stand than under the pure one. Geostatistics revealed that humus form patchiness was greater under the mixed stand than under the pure one and the improvement in decomposition processes seemed to be confined to spatial distribution of hornbeam litterfall. From a practical viewpoint, these results could provide ideas on the way of mixing tree species at stand level. We assume that with a given percentage of mull-forming tree species, a dispersed tree mixture provides a more extensive improvement than a clumped mixture.

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“…Differences in soil organic matter (SOM) quantity and quality and nutrient availability create 'islands of fertility' in soils under oak canopies that may be expected to support different microbial communities than the adjacent open grassland soils (Dahlgren et al 1997;Herman et al 2003;Jackson et al 1990). The input of oak litter into soils under oak canopies may be expected to produce a microbial community more able to degrade complex C, because litter inputs from oak contain more lignin and tannin than grassland litter (Deschaseaux and Ponge 2001;Lopez Llorca and Olivares Bernabeu 1997).…”

Section: Introductionmentioning

confidence: 99%

Microbial community utilization of recalcitrant and simple carbon compounds: impact of oak-woodland plant communities

2004

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Little is known about how the structure of microbial communities impacts carbon cycling or how soil microbial community composition mediates plant effects on C-decomposition processes. We examined the degradation of four (13)C-labeled compounds (starch, xylose, vanillin, and pine litter), quantified rates of associated enzyme activities, and identified microbial groups utilizing the (13)C-labeled substrates in soils under oaks and in adjacent open grasslands. By quantifying increases in non-(13)C-labeled carbon in microbial biomarkers, we were also able to identify functional groups responsible for the metabolism of indigenous soil organic matter. Although microbial community composition differed between oak and grassland soils, the microbial groups responsible for starch, xylose, and vanillin degradation, as defined by (13)C-PLFA, did not differ significantly between oak and grassland soils. Microbial groups responsible for pine litter and SOM-C degradation did differ between the two soils. Enhanced degradation of SOM resulting from substrate addition (priming) was greater in grassland soils, particularly in response to pine litter addition; under these conditions, fungal and Gram+ biomarkers showed more incorporation of SOM-C than did Gram- biomarkers. In contrast, the oak soil microbial community primarily incorporated C from the added substrates. More (13)C (from both simple and recalcitrant sources) was incorporated into the Gram- biomarkers than Gram+ biomarkers despite the fact that the Gram+ group generally comprised a greater portion of the bacterial biomass than did markers for the Gram- group. These experiments begin to identify components of the soil microbial community responsible for decomposition of different types of C-substrates. The results demonstrate that the presence of distinctly different plant communities did not alter the microbial community profile responsible for decomposition of relatively labile C-substrates but did alter the profiles of microbial communities responsible for decomposition of the more recalcitrant substrates, pine litter and indigenous soil organic matter.

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Changes in the composition of humus profiles near the trunk base of an oak tree (Quercus petraea (Mattus.) Liebl.)

Cited by 12 publications

References 32 publications

The heterogeneity of humus components in a virgin beech forest

The heterogeneity of humus components in a virgin beech forest

Variability and heterogeneity of humus forms at stand level: Comparison between pure beech and mixed beech-hornbeam forest

Microbial community utilization of recalcitrant and simple carbon compounds: impact of oak-woodland plant communities

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