Trap Jean, Raminoarison M., Cébron A., Razanamalala K., Razafimbelo T., Becquer Thierry, Plassard C., Blanchart Eric, Bernard Laetitia. (2024). Multiple nutrient limitation of the soil micro-food web in a tropical grassland revealed by nutrient-omission fertilization. Applied Soil Ecology, 198, 105376 [12 p.]. ISSN 0929-1393.
Titre du document
Multiple nutrient limitation of the soil micro-food web in a tropical grassland revealed by nutrient-omission fertilization
Année de publication
2024
Auteurs
Trap Jean, Raminoarison M., Cébron A., Razanamalala K., Razafimbelo T., Becquer Thierry, Plassard C., Blanchart Eric, Bernard Laetitia
Source
Applied Soil Ecology, 2024,
198, 105376 [12 p.] ISSN 0929-1393
Although involved in key functions of the terrestrial ecosystems, the activity and the diversity of soil microorganisms can be severely limited by energy and nutrients in weathered tropical soils. To optimize nutrient cycling for crop nutrition, assessing which nutrients limit the activity of the microbial food web is thus essential. This was our aim in this study carried out on a tropical ferrallitic soil from a natural grassland in Madagascar. For this purpose, we employed an innovative nutrient-omission approach in microcosms to test the distinct effects of omitting C, six nutrients (N, P, K, S, Ca, Mg) and a cocktail of micronutrients (B, Mn, Cu, Na and Mo) on the composition, biomass and activities of the microbial community and on the abundance and biomass of their nematode grazers. C and P were identified as primary limitations, but other nutrients (N, Mg and S) played significant roles as co-limiting factors. Some bacterial and fungal taxa were significantly associated to specific nutrient deficiencies and can act as biological indicators. Additionally, the abundance and biomass of microbialfeeding nematodes provided valuable insights into the responses of the soil microbial community to nutrient deficiencies. These findings contribute to our understanding of nutrient dynamics and microbial community growth in tropical grassland ecosystems and have implications for sustainable crop fertility management and ecosystem ecology in similar environments.
Plan de classement
Biologie du sol [074]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
MADAGASCAR ; ZONE TROPICALE
Localisation
Fonds IRD [F B010090648]
Identifiant IRD
fdi:010090648
