Publication
Functional microbial diversity in regenerating cutover peatlands responds to vegetation succession
Résumé
- While establishment of vegetation is the most visual indicator of regeneration on cutover peatland, the reinstatement of belowground functions is less well understood. Vegetation succession results in differences in peat quality in terms of C availability. The respiratory response of the soil microbial community to ecologically relevant substrates (community-level physiological profile, CLPP) such as those found in rhizosphere exudates and litter hydrolysates, is thought to reflect the activity and functional diversity of the soil microbial community, especially those involved in turnover of soluble photosynthate-derived C. 2. The relationship between CLPP and typical regeneration stages was investigated at five European peatlands, each with up to five sites representing a gradient of natural regeneration stages. We aimed to determine whether unaided revegetation consistently affected soil microbial CLPP, which environmental factors explained variation in CLPP on the scale of individual peatlands, and if these factors were consistent across different peatlands. 3. Within each peatland, a decomposition index based on diagnostic bands in Fourier transforminfrared spectra indicated that regeneration had generally started from a common base and that the influence of vegetation on the decomposition index declined with depth. In parallel, differences in vegetation cover between regeneration stages resulted in significantly different CLPP, but this effect decreased rapidly with soil depth. The magnitudes of the effect of vegetation succession versus soil depth appeared to be linked with the age range of the regeneration gradients. Hence, the effect of vegetation on CLPP is effectively diluted due to the remaining organic matter. Specific plant species described significant proportions of CLPP variability but these species were not consistent across peatland types. The effects of soil depth appeared to be peatland-specific. 4. Synthesis and applications . Together, the results indicate significant responses of the microbial community to vegetation succession, with the strength of the effect probably dependent on quantities of labile C allocation to the soil microbial community. Therefore, particularly in the early stages of regeneration of cutover peatlands, CLPP could provide vital information about the relative importance of different plant functional types on potential rates of labile C turnover.
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Proximité ontologique
Concepts associés (37)
Tourbe
La tourbe est une matière organique fossile formée par accumulation sur de longues périodes de temps de matière organique morte, essentiellement des végétaux, dans un milieu saturé en eau. La tourbe forme la majeure partie des sols des tourbières. Séchée, elle donne un combustible brun à noirâtre qui chauffe moins que le bois et le charbon. L'extraction de la tourbe a été l'une des causes de disparition ou dégradation de nombreuses zones humides, laissant parfois place à de vastes étangs (comme dans le marais audomarois).
Végétation
La végétation est l'ensemble des plantes qui poussent en un lieu donné selon leur nature. De la notion de végétation découlent les notions connexes de tapis végétal, de paysage végétal, de type de végétation et de formation végétale. On distingue la végétation naturelle composée de plantes sauvages dites spontanées de la végétation artificialisée composée de plantes cultivées. On considère ce qui pousse sur une surface donnée de sol, ou dans un milieu aquatique. On parle aussi de « couverture végétale » ou de « paysage végétal ».
Mire
A mire, peatland, or quagmire is a wetland area dominated by living peat-forming plants. Mires arise because of incomplete decomposition of organic matter, usually litter from vegetation, due to water-logging and subsequent anoxia. All types of mires share the common characteristic of being saturated with water, at least seasonally with actively forming peat, while having their own ecosystem. Like coral reefs, mires are unusual landforms that derive mostly from biological rather than physical processes, and can take on characteristic shapes and surface patterning.
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