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Des formes d'humus au bois mort et du bois mort aux formes d'humus : contribution à l'étude des formes d'humus et des communautés lombriciennes en zone forestière subalpine, avec une emphase particulière sur le bois mort

Tatti, Dylan ; Gobat, Jean-Michel (Dir.) ; Le Bayon, Claire (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

This thesis is part of a larger research, the DecAlp project. This latter is conduct in the Italian Alps (Trentino, I) and involved numerous researchers with the shared goal of elaborating a model for wood decomposition and its incorporation into the soil. This thesis focuses mainly on the humus forms. They occupy a key role in the DecAlp project as they allow linking the aerial and the...

Bas-marais et prairies humides du Haut-Jura : relations sol-végétation et évolution

Rion, Vanessa ; Gobat, Jean-Michel (Dir.) ; Vittoz, Pascal (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Wetlands are ecosystems of high conservation value. They are a great source of vegetation types and biodiversity and contain plant species specialized and adapted to permanently or temporary water-saturated soils. In order to maintain their species richness and their quality, these fragile ecosystems must be conserved. However, several studies have demonstrated that some wetlands decreased...

La faune du sol comme indicateur de la qualité des sols urbains : étude des communautés de vers de terre, d'enchytréides et de nématodes et de leurs relations avec des sols d'âges différents

Amossé, Joël ; Gobat, Jean-Michel (Dir.) ; Mitchell, Edward (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2014.

Les sols sont l’une des composantes essentielles de l’écosystème urbain. Ils y jouent un rôle majeur dans la régulation du climat, le cycle de la matière organique et des éléments nutritifs. Tous ces processus sont, à des degrés divers et comme dans les sols non urbains, contrôlés par les organismes vivants du sol pour lesquels le sol remplit une fonction d’habitat. La faune du...

Etude écosystémique des marais non boisés de la rive sud du lac de Neuchâtel (Suisse) : phytosociologie, pédologie, hydrodynamique et hydrochimie, production végétale, cycles biogéochimiques et influence du fauchage sur la végétation

Buttler, Alexandre ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 1987.

Ecosystemic study of non-wooded marshes of the south shore of lake Neuchâtel (Switzerland). This ecosystemic study was carried out to get a better knowledge of the ecology of young marshes which were formed on the south shore of lake Neuchâtel when the Jura waterways were diverted. The objective of the research was to present arguments which could be used as guidelines for the organizations...

Etude sur la purification des eaux de gravité passant à travers le sol forestier

Scherrer, Luc ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

French-Swiss silvicultural people wishes to know its impact on the quality of groundwater. The Interreg Alpeau project combines forest engineers, managers of water resources and scientists to measure this influence. The geographical distribution of the project shines around the Jura mountains between Chambéry (F) and Neuchâtel (CH). This study carried out on two sites of ground, Gibloux in...

Distribution des communautés lombriciennes et pédogénèse en forêts alluviales : étude le long de deux gradients écologiques

Salomé, Clémence ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012 ; 2260.

Soil is an essential compartment in ecosystem functioning. As a physical and chemical support, soils play a crucial role in recycling elements and supplying plant in their essential nutrients. These functions mainly take place in the organo-mineral layer, corresponding in most of the cases to the upper soil layer. This latter is composed of organo-mineral associations as a result of interactions...

Etude de la succession secondaire dans le cadre de la pratique des cultures sur brûlis au Menabe central, Madagascar

Raharimalala, Hanitriaina Olga Jeannine ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2011 ; 2239.

Madagascar forests are among the most biologically rich and unique ecosystems. Strong pressure from human activities causes, however, a rapid destruction of natural habitats and a massive loss of biodiversity. Slash and burn is one of the causes of this pressure. This is a traditional practice in many areas and predominantly in Madagascar, particularly in the South-West. Secondary vegetation that...

Roots, earthworms and mycorrhizae : individual and interactive effects on some chemical, physical and biological properties of soils

Kohler-Milleret, Roxane ; Gobat, Jean-Michel (Dir.) ; Le Bayon, Claire (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2096.

The belowground communities include a large variety of soil organisms showing highly complex interactions across trophic or non-trophic groups. Soil organisms have been recognized to contribute to a wide range of ecosystem services. They can modify soil physical structure and water regimes, enhancing the amount and efficiency of nutrient acquisition by the vegetation and improving plant health....

Alluvial soils in the Swiss Alps : historical, geomorphological and pedogenetic aspects

Bullinger-Weber, Géraldine ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; 1946.

Influence de la qualité des composts et de leurs extraits sur la protection des plantes contre les maladies fongiques

Larbi, Mohamed ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1869.

The potential of composts and compost extracts to improve plant health has often been shown. However, there is no final conclusion about the mechanisms of inhibition of plant diseases by composts and their extracts. Better knowledge about the factors influencing the phytosanitary potential of compost and their extracts appears indispensable to optimize their utilization for plant protection.The...