Communautés de sous-bois des peupleraies artificielles : relation entre phytomasse, richesse spécifque et perturbations

Laquerbe, Marc

doi:10.1051/forest:19990708

Cited by 8 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although intensively regulated for centuries, the riparian plant communities of the Garonne River still show high diversity, at least near the main channel (Tabacchi & Planty‐Tabacchi ). Despite a clear disconnection from the river channel, which disrupts the optimal biogeomorphic successional scheme of a riparian system, our results confirmed those of Laquerbe (, ), who observed high levels of plant diversity in the understory of actively managed poplar plantations, suggesting that human‐made disturbance could partially replace natural disturbance. However, at the time, the question of whether near‐natural riparian and artificial communities converge in the long term remained unresolved yet relevant from a conservation perspective, especially in regard to planning the progressive abandonment of crops that have become ecologically unsustainable.…”

Section: Discussionsupporting

confidence: 89%

“…Active poplar plantations (hereafter, “active sites”) were plantations actively managed in long rotations (age of trees at harvest >15 years) with low poplar density (planted poles spaced 6–7 m). Fertilization was rarely applied and disking was performed from one to three times per year (decreasing as the plantation aged) and disappeared during the last few years preceding clearing (Laquerbe , ). Harvested poplar plantations “harvested sites” were once active plantations that had been harvested by clear‐cutting (confirmed by the presence of a grid of hybrid poplar stumps) and left to spontaneously recolonize vegetation (i.e.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Poplar plantations along regulated rivers may resemble riparian forests after abandonment: a comparison of passive restoration approaches

Masip

Tabacchi

2016

Restoration Ecology

View full text Add to dashboard Cite

Abandoning hybrid poplar plantations may be an alternative strategy for enlarging natural riparian corridors along regulated rivers where forest regeneration no longer takes place. Despite the generally high local diversity of plants in poplar plantations, their capacity to converge towards riparian forests following abandonment remains largely untested and uncertain, because maintenance-related disturbance of plantations favors ruderal, not strictly riparian specialists. We assessed the spontaneous recolonization of vegetation in abandoned hybrid poplar plantations following two management strategies: harvesting or simple abandonment of standing trees. The floristic composition in four chronosequences of 10 active (1-15 years), 17 harvested (1-15 years), and 10 abandoned (8-20 years) hybrid poplar plantations, as well as 10 riparian sites established at gravel bars that appeared following the cessation of in-channel gravel mining (8-25 years) along the highly regulated Garonne River (SW France) was assessed in the framework of ecological disturbance theory. Both harvested and abandoned sites still resembled active plantations more than riparian forests. When poplar resprouting was low after harvesting, sites were dominated by light-demanding, nitrophilous herbs, sub-shrubs, and vines showing both competitive and ruderal traits, and vegetation composition remained stable over time. Abandoned and harvested sites with high poplar resprouting developed forest communities in which competitive species that tolerate and generate shade dominated, and tree species recruitment was higher. Riparian sites hosted the highest number of indicator species, mainly wetland and exotic. Simple passive restoration strategies like abandonment of plantations can help create valuable ecosystems, although ones that diverge from riparian forests colonizing new fluvial landforms.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Poplar plantations along regulated rivers may resemble riparian forests after abandonment: a comparison of passive restoration approaches

Masip

Tabacchi

2016

Restoration Ecology

View full text Add to dashboard Cite

show abstract

“…Une étude récente [21] a montré que, l'observation de plantations très âgées (plus de 30 ans) et non entretenues depuis de plusieurs années, permet une augmentation de la richesse spécifique par l'apparition de nombreuses espèces de milieux plus stables, à durée de vie plus élevée.…”

Section: Herbacéesunclassified

Richesse sp�cifique et phytomasse des sous-bois de peupleraies cultiv�es en bordure de Garonne (Sud-Ouest de la France)

Laquerbe

2000

Ann. For. Sci.

Self Cite

View full text Add to dashboard Cite

Résumé -Les peupleraies cultivées occupent de vastes surfaces dans la plaine alluviale de la Garonne. Des communautés végétales s'y développent en sous-bois, perturbées par des pratiques d'entretien (disquage) dont l'intensité et la fréquence varient en fonction de l'âge des peupleraies. Nous nous sommes intéressés à l'influence de ce type d'entretien sur les communautés de sous-bois. Quatre peupleraies ont été choisies afin d'illustrer les différents types d'entretien. Les prélèvements d'espèces de sous-bois ont été effectués à des dates tenant compte de la phénologie des espèces et des périodes d'entretien. À l'échelle des peupleraies, la richesse spécifique des communautés végétales de sous-bois est d'autant plus élevée que le niveau d'entretien (intensité et fréquence) est plus marqué. Cette tendance est essentiellement due à des espèces annuelles et secondairement, bisannuelles. L'analyse réalisée à partir de quadrats répartis au hasard dans les peupleraies montre que la richesse spécifique des plantes de sous-bois s'accroît en fonction de l'augmentation de l'intensité et de la fréquence de la perturbation créée par l'entretien, alors que cette relation est inversée en ce qui concerne les phytomasses. Cette double tendance est observée entre les peupleraies et au sein des quadrats d'une même peupleraie. Dans ce dernier cas, les différences observées sont moins significatives. Des interactions apparaissent entre le niveau général d'entretien d'une peupleraie et l'exposition à cet entretien de différents définies au sein de cette peupleraie. La richesse spécifique des localisations graduellement plus exposées à l'entretien augmente jusqu'à une valeur seuil, au-delà de laquelle elle diminue. Ce seuil n'est atteint que dans le cas de la peupleraie dont le niveau d'entretien est le plus élevé. Ces résultats sont discutés dans le cadre de la théo-rie des perturbations écologiques. Les peupleraies, souvent considérées comme des facteurs de banalisation du paysage, constituent, en fait, des milieux riches et diversifiés; elles peuvent jouer un rôle majeur dans le contrôle de la diversité des écosystèmes adjacents. perturbation / richesse spécifique / phytomasse / sous-bois / peupleraies cultivées Abstract -Species richness and phytomass in understory cultivated poplar groves at the margin of the Garonne (South-West France). Cultivated poplar groves occupy an important part of the Garonne alluvial lowlands. Plant communities belonging to the understory, are disturbed by upkeep (disking), i.e. weeding by a metallic disk which totally destroys and buries vegetation. This upkeep differs among poplar groves: the intensity and the frequency of which decreases with the age of the poplar grove and it totally disappears during the years preceding clearing. The four poplar groves chosen for this study showed different upkeep levels. Understory species were sampled taking into account the species phenology and upkeep periods, in order to study the dynamics of the species richness and phytomass of plant communities in the unde...

show abstract

“…While half of the species became established in less than a year, the remaining species may require a longer time to become established, emphasizing the importance of life strategies in determining plant assemblages. However, the opposite pattern has been reported for French poplar plantations [21,22,65]. On the other hand, higher species richness was observed in plantations where strip tillage had been carried out for site preparation in comparison with full-area ploughing [24].…”

Section: Comparison Of Different Types Of Poplar Plantationsmentioning

confidence: 74%

The Effects of Poplar Plantations on Vascular Plant Diversity in Riparian Landscapes

Martín‐García

Jactel

Rueda

2016

Forests

View full text Add to dashboard Cite

Abstract:Riparian vegetation, which performs many key ecological functions, has been modified or lost at an alarming rate during the past century as a result of human activity. The aims of this study are (a) to investigate the effects of poplar plantations on plant diversity in riparian zones; and (b) to estimate the ecological implications of extending cover by poplar plantations. For this purpose, we assessed species richness, habitat indicator species and functional diversity based on Grime's C-S-R strategies. We used non-metric multidimensional scaling to examine the role of environmental factors such as soil properties, forest structure and management. Disturbance, in particular the frequency of harrowing, led to a decline in species richness and modified the indicator species and functional diversity by favoring Ruderal (R) species at the expense Stress-Tolerant (S) and Competitor (C) species, which are better suited to riparian forest conditions. Poplar plantations should not be used as surrogates for riparian forests, and minimizing harrowing in poplar plantations promotes vascular plant diversity. Furthermore, reintroduction of herbs, ferns and geophytes with a high conservation value and low seed dispersal capacity is advisable from the sixth year after establishment, once harrowing for weed control has been completed.

show abstract

Communautés de sous-bois des peupleraies artificielles : relation entre phytomasse, richesse spécifque et perturbations

Cited by 8 publications

References 9 publications

Poplar plantations along regulated rivers may resemble riparian forests after abandonment: a comparison of passive restoration approaches

Poplar plantations along regulated rivers may resemble riparian forests after abandonment: a comparison of passive restoration approaches

Richesse sp�cifique et phytomasse des sous-bois de peupleraies cultiv�es en bordure de Garonne (Sud-Ouest de la France)

The Effects of Poplar Plantations on Vascular Plant Diversity in Riparian Landscapes

Contact Info

Product

Resources

About