Résumé
As forest ecosystems generally develop on poor and unfertilized soils, nutrient cycles and input/output budgets, notably in the humus compartment, are key to determining forest sustainability. Previous studies generally focused on the ecosystem scale or only on C, N, P in the humus layer. Our objectives in this study are to establish these budgets for principal elements, considering dust inputs and, for the first time, particulate outputs. To achieve these objectives, the inputs and outputs of the elements in litterfall, particulates (dust inputs and particulates in the outgoing solution) and solution were quantified in mulls in two contrasting soils in beech ecosystems monitored for 7 years. The concentrations of the elements in the particulate outputs were 3 or 16 times higher than those in dust, because some particles were produced in the humus. The input/output budgets were balanced for K, Na and S in both soils and for P, Si and Mg in one soil. These elements were transported in the humus mainly as a solution or as a soluble form in plant tissues. For Ca and Mn in both soils and for P, Si and Mg in one soil, the elements found in biominerals, the inputs were higher than the outputs, indicating that other outputs were not taken into account in this balance, such as biomineral sedimentation or uptake by fungi. These results show the importance of the humus particles in element cycles.
Auteurs, date et publication :
Auteurs Marie Dincher , Christophe Calvaruso , Marie-Pierre Turpault
Publication : Biogeochemistry
Date : 2020
Volume : 151
Issue : 1
Pages : 1-14
Catégorie(s)
#FORET Montiers #INRAERésumé
The vertical distribution of chlorophyll in stratified lakes and reservoirs frequently exhibits a maximum peak deep in the water column, referred to as the deep chlorophyll maximum (DCM). DCMs are ecologically important hot spots of primary production and nutrient cycling, and their location can determine vertical habitat gradients for primary consumers. Consequently, the drivers of DCM structure regulate many characteristics of aquatic food webs and biogeochemistry. Previous studies have identified light and thermal stratification as important drivers of summer DCM depth, but their relative importance across a broad range of lakes is not well resolved. We analyzed profiles of chlorophyll fluorescence, temperature, and light during summer stratification from 100 lakes in the Global Lake Ecological Observatory Network (GLEON) and quantified two characteristics of DCM structure: depth and thickness. While DCMs do form in oligotrophic lakes, we found that they can also form in eutrophic to dystrophic lakes. Using a random forest algorithm, we assessed the relative importance of variables associated with light attenuation vs. thermal stratification for predicting DCM structure in lakes that spanned broad gradients of morphometry and transparency. Our analyses revealed that light attenuation was a more important predictor of DCM depth than thermal stratification and that DCMs deepen with increasing lake clarity. DCM thickness was best predicted by lake size with larger lakes having thicker DCMs. Additionally, our analysis demonstrates that the relative importance of light and thermal stratification on DCM structure is not uniform across a diversity of lake types.
Auteurs, date et publication :
Auteurs Taylor H. Leach , Beatrix E. Beisner , Cayelan C. Carey , Patricia Pernica , Kevin C. Rose , Yannick Huot , Jennifer A. Brentrup , Isabelle Domaizon , Hans-Peter Grossart , Bastiaan W. Ibelings , Stéphan Jacquet , Patrick T. Kelly , James A. Rusak , Jason D. Stockwell , Dietmar Straile , Piet Verburg
Publication : Limnology and Oceanography
Date : 2025
Volume : 63
Issue : 2
Pages : 628-646
Catégorie(s)
#INRAE #OLARésumé
Abstract. Climate change modifies the thermal regime and the oxygen solubility of lakes globally, resulting in the alteration of ecosystem processes, lake habitats and concentrations of key parameters. The use of one-dimensional (1D) lake model for global scale studies has become the standard in lake research to evaluate the effects of climate change. However, such approach requires global scale forcing parameters which have several limitations that are barely discussed, such as the need of serious downscaling. Furthermore, projections of lakes' thermal regime are hardly ever confronted with long-term observations that extent for more than a few decades. These shortfalls limit the robustness of hindcast/ forecast simulations on decadal to centennial timescales. In this study, several 1D lake models' robustness was tested for long-term variations based on 63 years of limnological data collected by the French Observatory of LAkes (OLA). Here we evaluate the possibility to force mechanistic models by following the long-term evolution of shortwave radiation and air temperature while providing realistic seasonal trend for the other parameters for which local scale downscaling often lacks accuracy. Then, the effects of climate change on the thermal regime and oxygen solubility were analyzed in the four-largest French peri-Alpine lakes. Our results show that 1D lake models forced by air temperatures and short-wave radiations accurately predict variations in lake thermal regime over the last four to six decades, with RMSE <1.95 °C. During the last three decades, water temperatures have increased by 0.46 °C decade–1 (±0.02 °C) in the epilimnion and 0.33 °C decade–1 (±0.06 °C) in the hypolimnion. Concomitantly and due to thermal change, O2 solubility has decreased by -0.104 mg L–1 decade–1 (±0.005 mg L–1) and -0.096 mg L–1 decade–1 (±0.011 mg L–1) in the epilimnion and hypolimnion, respectively. Based on the ssp370 socio-economic pathway of the IPCC, perialpine lakes could face an increase of 3.80 °C (±0.20 °C) in the next 70 years, accompanied by a decline of 1.0 mg L–1 (±0.1 mg L–1) of O2 solubility. These results suggest important degradation in lake thermal and oxygen conditions and a loss of habitats for endemic species.
Auteurs, date et publication :
Auteurs Olivia Desgué-Itier , Laura Melo Vieira Soares , Orlane Anneville , Damien Bouffard , Vincent Chanudet , Pierre-Alain Danis , Isabelle Domaizon , Jean Guillard , Théo Mazure , Najwa Sharaf , Frédéric Soulignac , Viet Tran-Khac , Brigitte Vinçon-Leite , Jean-Philippe Jenny
Date : 2022
Catégorie(s)
#INRAE #OLARésumé
Abstract. Long-term effects of climate change on lakes globally will include a substantial modification in the thermal regime and the oxygen solubility of lakes, resulting in the alteration of ecosystem processes, habitats, and concentrations of critical substances. Recent efforts have led to the development of long-term model projections of climate change effects on lake thermal regimes and oxygen solubility. However, such projections
are hardly ever confronted with observations extending over multiple decades. Furthermore, global-scale forcing parameters in lake models present several limitations, such as the need of significant downscaling. In this study, the effects of climate change on thermal regime and oxygen solubility were analyzed in the four largest French peri-alpine lakes over 1850–2100. We tested several one-dimensional (1D) lake models' robustness for long-term variations based on up to 63 years of limnological data collected by the French Observatory of LAkes (OLA). Here, we evaluate the possibility of forcing mechanistic models by following the long-term
evolution of shortwave radiation and air temperature while providing
realistic seasonal trends for the other variables for which local-scale
downscaling often lacks accuracy. Based on this approach, MyLake, forced by
air temperatures and shortwave radiations, predicted accurately the
variations in the lake thermal regime over the last 4 to 6 decades,
with RMSE < 1.95 ∘C. Over the previous 3 decades, water temperatures have increased by 0.46 ∘C per decade (±0.02 ∘C) in the epilimnion and 0.33 ∘C per decade (±0.06 ∘C) in the hypolimnion. Concomitantly and due to thermal change, O2 solubility has decreased by −0.104 mg L−1 per decade (±0.005 mg L−1) and −0.096 mg L−1 per decade (±0.011 mg L−1) in the epilimnion and hypolimnion, respectively. Based on the shared socio-economic pathway SSP370 of the Intergovernmental Panel on Climate Change (IPCC), peri-alpine lakes could face an increase of 3.80 ∘C (±0.20 ∘C) in the next 70 years, accompanied by a decline of 1.0 mg L−1 (±0.1 mg L−1) of O2 solubility. Together, these results highlight a critical alteration in lake thermal and oxygen conditions in the coming decades, and a need for a better integration of long-term lake observatories data and lake models to anticipate climate
effects on lake thermal regimes and habitats.
Auteurs, date et publication :
Auteurs Olivia Desgué-Itier , Laura Melo Vieira Soares , Orlane Anneville , Damien Bouffard , Vincent Chanudet , Pierre Alain Danis , Isabelle Domaizon , Jean Guillard , Théo Mazure , Najwa Sharaf , Frédéric Soulignac , Viet Tran-Khac , Brigitte Vinçon-Leite , Jean-Philippe Jenny
Publication : Hydrology and Earth System Sciences
Date : 2023
Volume : 27
Issue : 3
Pages : 837-859
Catégorie(s)
#INRAE #OLAAuteurs, date et publication :
Auteurs Luiz A. Domeignoz-Horta , Laurent Philippot , Celine Peyrard , David Bru , Marie-Christine Breuil , Florian Bizouard , Eric Justes , Bruno Mary , Joël Léonard , Ayme Spor
Publication : Global Change Biology
Date : 2025
Volume : 24
Issue : 1
Pages : 360-370
Catégorie(s)
#ACBB #ACBB Mons #INRAEAuteurs, date et publication :
Auteurs Adam Ahanchédé , José E. F. Alfaya , L. W. Andersen , Didier Azam , Ma. Anita M. Bautista , Anne-Laure Besnard , Gregorio Bigatti , Anthony Bouétard , Marie-Agnès Coutellec , Eben-Ezer B. K. Ewédjè , Reiko Fuseya , Ricardo GarcÍa-Jiménez , M. Haratian , Olivier J. Hardy , L.-E. Holm , Casey W. Hoy , Eriko Koshimizu , V. Loeschcke , Violeta López-Márquez , Carlos A. Machado
Publication : Molecular Ecology Resources
Date : 2013
Volume : 13
Issue : 1
Pages : 158-159
Catégorie(s)
#INRAE #PEARLAuteurs, date et publication :
Auteurs Jean-François Mangot , Didier Debroas , Isabelle Domaizon
Publication : Hydrobiologia
Date : 2025
Volume : 659
Issue : 1
Pages : 37-48
Catégorie(s)
#INRAE #OLAAuteurs, date et publication :
Auteurs Abad Chabbi , Nimai Senapati , André Giostri , Francoise Vertes , M. Carrozi , Gilles Lemaire , Francois Gastal , Sylvie Recous , Katja Klumpp , Raia Silvia Massad , Cornelia Rumpel
Publication : Fourrages
Date : 2025
Issue : 223
Pages : 241-248
Catégorie(s)
#ACBB #ACBB Lusignan #ACBB Theix #INRAEAuteurs, date et publication :
Auteurs Gaétan Pottier , Didier Azam , William R. C. Beaumont , Pierre-Yves Le Bail , Jacques Rives , Jean-Marc Roussel , Régis Vigouroux , Frédéric Marchand
Date : 2018
Catégorie(s)
#INRAE #PEARLRésumé
Phosphorus (P) nutrition is essential to both plant yield and soil organic matter (SOM) input. However, continuous extraction of P by plants and biomass harvesting can lead to soil P stock depletion, a reduction in crop yields and ultimately a reduction in organic matter input to the soil. In this work, we analysed P, C and N stock trends in the 0-30 cm topsoil layer cultivated with permanent cropland (CC) and mowed permanent grassland (GG) for 13 years. In addition, we characterized the changes in P organic forms by using P-31-NMR. The results showed that the amount of P exported within 13 years was 10% greater in GG than in CC (295 and 268 kg ha(-1), respectively). The total P stocks decreased under both the CC and GG management systems (0.30 and 0.25 Mg ha(-1), respectively). This depletion was mainly observed in total Pi forms, which recorded reductions of 0.75 and 0.29 Mg ha(-1) in GG and CC, respectively. The total Po stock increased by 42.6% in GG; these results were consistent with the increase in C and N stocks in GG (2.6 and 0.19 Mg ha(-1), respectively) and their reduction in CC (-4.2 and -0.38 Mg ha(-1), respectively). Although P depletion mainly affected the P pool presenting the highest lability (labile P), this depletion did not have a negative effect on plant yield after 13 years due to the buffering capacity of P pools presenting less lability (moderately labile P). Mowing permanent grasslands led to a change in the pool of labile P from inorganic to organic forms and an increase in soil C and N stocks. Based on the P-31-NMR technique, permanent grasslands significantly reduced alpha-glycerophosphate and increased myo-IHP and adenosine monophosphate more than the permanent cropland. Although there was no significant decrease in productivity, the depletion of available P should be monitored over time, especially in mown permanent grassland crops, to prevent potential nutrient stress.
Auteurs, date et publication :
Auteurs Andre Somavilla , Laurent Caner , Isley Cristiellem Bicalho da Silva , Danilo dos Santos Rheinheimer , Abad Chabbi
Publication : FRONTIERS IN SOIL SCIENCE
Date : 2022
Volume : 2