Decomposition dynamics of Myrtus communis and Quercus ilex leaf litter: Mass loss, microbial activity and quality change

Fioretto, A.; Papa, Stefania; Pellegrino, A.; Fuggi, Amodio

doi:10.1016/j.apsoil.2006.11.006

Cited by 65 publications

(36 citation statements)

References 35 publications

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“…2). Our results showed a wider range of R LL than laboratory data in past studies in which broad-leaved litter was incubated; Fioretto et al (2007) reported CO 2 efflux from leaf litter samples ranging from 30 to 50 mg CO 2 kg -1 h -1 at a T LL of 25℃ and W LL of 0.1-1.5 g g -1 , and Dilly and Munch (1996) indicated that CO 2 efflux from leaf litter samples ranged from roughly 100 to 700 mg CO 2 kg -1 h -1 at a T LL of 22℃ and W LL of 2.5 g g -1 . However, these authors measured CO 2 efflux from leaf litter samples at a constant T LL and/or W LL in a laboratory experiment, whereas our results were produced in the field under T LL values ranging from 7℃ to 34℃ and W LL values ranging from 0.014 to 3.014 g g -1 .…”

Section: Discussioncontrasting

confidence: 47%

CO<sub>2</sub> efflux from decomposing leaf litter stacks is influenced by the vertical distribution of leaf litter water content and its temporal variation

Ataka

Kominami

Jomura

et al. 2015

J. Agric. Meteorol.

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We evaluated the temporal changes in the vertical distribution of leaf litter respiration (R LL ) due to changes of leaf litter water content (W LL ) within the leaf litter layer (L layer) using in situ direct measurements. To investigate the vertical distribution of R LL and W LL within the leaf litter layer over a time-series, we measured the R LL and W LL of 10 separate layers in vertical leaf litter stacks fixed to the forest floor using wire pins. Measurements were conducted for 30 stacks in a temperate broad-leaved secondary forest between May 2008 and January 2009. In the warm season, high R LL was observed at high W LL , while low R LL was observed at low W LL . R LL was comparatively lower during the cool season than during the warm season regardless of the magnitude of W LL. The temperature sensitivity of R LL differed depending on W LL ; temperature increases under low-moisture conditions had small effects on R LL, while under higher-moisture conditions, R LL was more responsive to temperature increases. Small differences in position within the leaf litter stack affected the vertical variation of W LL and, consequently, there was large distribution in R LL during the wet period and small distribution in R LL (totally small values) during the dry period. Thus, CO 2 efflux from the net L layer was strongly affected by R LL distribution induced by the local wetting within the L layer. In estimating CO 2 efflux from the L layer using water content of the L layer, monitoring of the water content of the L layer, which takes into account the vertical distribution in W LL within the L layer, is necessary.

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Section: Discussioncontrasting

confidence: 47%

CO<sub>2</sub> efflux from decomposing leaf litter stacks is influenced by the vertical distribution of leaf litter water content and its temporal variation

Ataka

Kominami

Jomura

et al. 2015

J. Agric. Meteorol.

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“…A fairly good edaphic humidity, together with the lack of direct solar radiation, favours the humus formation process, providing a substantial improvement of the nutrient availability in the soil (Coûteaux et al 1995;Zanella et al 2011). Indeed, the nutrient availability in the vegetation of Pistacio lentisci-Rhamnetalia alaterni (clusters 1-4) tends to be lower because high temperatures, drought and solar radiation cause a quick oxidation of the organic matter and its periodical volatilization due to wildfires (González-Pérez et al 2004), whereas the vegetation of Quercetalia ilicis (clusters 5-6) is less frequently burnt and produces more and better humus (Fioretto et al 2007). …”

Section: Eiv Assessmentmentioning

confidence: 99%

A test on Ellenberg indicator values in the Mediterranean evergreen woods (Quercetea ilicis)

Marcenò

Guarino²

2015

Rend. Fis. Acc. Lincei

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The consistency and reliability of Ellenberg's indicator values (Eiv) as ecological descriptors of the Mediterranean evergreen vegetation ascribed to the phytosociological class Quercetea ilicis have been checked on a set of 859 phytosociological relevés 9 699 species. Diagnostic species were identified through a Twinspan analysis and their Eiv analyzed and related to the following independent variables: (1) annual mean temperatures, (2) annual rainfall. The results provided interesting insights to disentangle the current syntaxonomical framework at the alliance level demonstrating the usefulness of ecological indicator values to test the efficiency and predictivity of the phytosociological classification.

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“…These contrasted species-specific fuel moistures could partly explain the non-linearities of the (EWTCAN, VI) relationship as a response of LAI-dependent differential functional diversity. We might also wonder if the seasonal variations of LMA (see [54] for a review), as an increase in the canopy as a function of leaf aging [55] or the LMA decrease in the litter layer as a function of decomposition [56], could have substantially affected EWTCAN, so we calculated with a constant LMA, as already pointed out in [4,20], but which is hardly ever considered in regional-scale EWTCAN assessment from remote sensing. Indeed, an increase in LMA for aged leaves would enhance EWTCAN at the end of the dry season and, in turn, increase the (EWTCAN, VI) slope for high LAI sites.…”

Section: Spatial and Temporal Relationship Between Ewtcan And Remotelmentioning

confidence: 99%

Regional Equivalent Water Thickness Modeling from Remote Sensing across a Tree Cover/LAI Gradient in Mediterranean Forests of Northern Tunisia

2015

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Abstract:The performance of vegetation indexes derived from moderate resolution imaging spectroradiometer (MODIS) sensors is explored for drought monitoring in the forests of Northern Tunisia; representing a transition zone between the Mediterranean Sea and the Sahara Desert. We investigated the suitability of biomass and moisture vegetation indexes for vegetation water content expressed by the equivalent water thickness (EWT) in a Mediterranean forest ecosystem with contrasted water budgets and desiccation rates. We proposed a revised EWT at canopy level (EWTCAN) based on weekly field measurements of fuel moisture in seven species during the 2010 dry period, considering the mixture of plant functional types for water use (trees, shrubs and herbaceous layers) and a varying vegetation cover. MODIS vegetation indexes computed and smoothed over the dry season were highly correlated with the EWTCAN. The performances of moisture indexes Normalized Difference Infrared Index (NDII6 and NDII7) and Global Moisture Vegetation Index (GVMI6 and GVMI7) were comparable, whereas for biomass vegetation indexes, Normalized Difference 1938Vegetation Index (NDVI), Modified Soil Adjusted Vegetation Index (MSAVI) and Adjusted Normalized Difference Vegetation Index (ANDVI) performed better than Enhanced Vegetation Index (EVI) and Soil Adjusted Vegetation Index (SAVI). We also identified the effect of Leaf Area Index (LAI) on EWTCAN monitoring at the regional scale under the tree cover/LAI gradient of the region from relatively dense to open forest. Statistical analysis revealed a significant decreasing linear relationship; indicating that for LAI less than two, the greater the LAI, the less responsive are the vegetation indexes to changes in EWTCAN; whereas for higher LAI, its influence becomes less significant and was not considered in the inversion models based on vegetation indexes. The EWTCAN time-course from LAI-adapted inversion models based on significantly-related vegetation indexes to EWTCAN showed close profiles resulting from the inversion models using NDVI, ANDVI, MSAVI and NDII6 applied during the dry season. The developed EWTCAN model from MODIS vegetation indexes for the study region was finally tested for its ability to capture the topo-climatic effects on the seasonal and the spatial patterns of desiccation/rewetting for keystone periods of Mediterranean vegetation functioning. Implications for further use in scientific developments or management are discussed.

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Decomposition dynamics of Myrtus communis and Quercus ilex leaf litter: Mass loss, microbial activity and quality change

Cited by 65 publications

References 35 publications

CO<sub>2</sub> efflux from decomposing leaf litter stacks is influenced by the vertical distribution of leaf litter water content and its temporal variation

CO<sub>2</sub> efflux from decomposing leaf litter stacks is influenced by the vertical distribution of leaf litter water content and its temporal variation

A test on Ellenberg indicator values in the Mediterranean evergreen woods (Quercetea ilicis)

Regional Equivalent Water Thickness Modeling from Remote Sensing across a Tree Cover/LAI Gradient in Mediterranean Forests of Northern Tunisia

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