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We studied the response curves of Dactylis glomerata to addition of nitrogen (N), potassium (K), and lime in presence of a range of added phosphorus (P) on an acid xeric heath soil (pH 4.3) of Tierra del Fuego (Argentina). The heath... more
We studied the response curves of Dactylis glomerata to addition of nitrogen (N), potassium (K), and lime in presence of a range of added phosphorus (P) on an acid xeric heath soil (pH 4.3) of Tierra del Fuego (Argentina). The heath community developed on the soil has dominated by a 50% of cover of an evergreen dwarf shrub (Empetrum rubrum)
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According to the Paris Agreement 2015, increased carbon sequestration by soils is a vital option for climate change mitigation and, simultaneously, improves soil health and food security. Agricultural soils are globally depleted in soil... more
According to the Paris Agreement 2015, increased carbon sequestration by soils is a vital option for climate change mitigation and, simultaneously, improves soil health and food security. Agricultural soils are globally depleted in soil organic carbon and, therefore, exhibit a high potential for carbon sequestration. Various agroecological practices aim to increase or maintain soil organic carbon through increasing carbon inputs in the soil (e.g., amendments, plant residues, cover crops) and/or through reducing carbon losses (e.g., reduced or no tillage, adapted grazing). However, these practices have the potential to increase greenhouse gas emissions, which limits their effectiveness in terms of climate change mitigation. The EJP-SOIL project TRUESOIL (2022-2025) studies trade-offs between agricultural management practices aiming at increasing carbon sequestration and reducing greenhouse gas emissions from agroecosystems across crops, soil properties and climates. TRUESOIL investig...
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Estimations of Net Ecosystem Exchange (NEE) are crucial to assess the carbon sequestration/carbon source capacity of agricultural systems. Although several global models have been built to describe carbon flux patterns based on flux tower... more
Estimations of Net Ecosystem Exchange (NEE) are crucial to assess the carbon sequestration/carbon source capacity of agricultural systems. Although several global models have been built to describe carbon flux patterns based on flux tower data, South American ecosystems (and croplands in particular) are underrepresented in the databases used to calibrate these models, leading to large uncertainties in regional and global NEE estimation. Despite the fact that almost half of the land surface is used worldwide for agricultural activities, these models still do not include variables related to cropland management. Using enhanced vegetation index (EVI) derived from MODIS imagery (250 m) and monthly CO2 exchange from a 9-year record of an eddy covariance (EC) flux tower in a crop field in the Inland Pampas region, we developed regression models to predict monthly NEE. We tested whether including a term for crop identity/land cover as a categorical variable (maize, soybean, wheat, and fall...
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Many remote sensing‐based evapotranspiration (RSBET) algorithms have been proposed in the past decades and evaluated using flux tower data, mainly over North America and Europe. Model evaluation across South America has been done locally... more
Many remote sensing‐based evapotranspiration (RSBET) algorithms have been proposed in the past decades and evaluated using flux tower data, mainly over North America and Europe. Model evaluation across South America has been done locally or using only a single algorithm at a time. Here, we provide the first evaluation of multiple RSBET models, at a daily scale, across a wide variety of biomes, climate zones, and land uses in South America. We used meteorological data from 25 flux towers to force four RSBET models: Priestley–Taylor Jet Propulsion Laboratory (PT‐JPL), Global Land Evaporation Amsterdam Model (GLEAM), Penman–Monteith Mu model (PM‐MOD), and Penman–Monteith Nagler model (PM‐VI). was predicted satisfactorily by all four models, with correlations consistently higher () for GLEAM and PT‐JPL, and PM‐MOD and PM‐VI presenting overall better responses in terms of percent bias (%). As for PM‐VI, this outcome is expected, given that the model requires calibration with local data. ...
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The use of cover crops, combined with low N fertilization and no-tillage, reduces the environmental impacts of agriculture. Legume cover crops provide N to the agroecosystem and allow N fertilization to be reduced without losing... more
The use of cover crops, combined with low N fertilization and no-tillage, reduces the environmental impacts of agriculture. Legume cover crops provide N to the agroecosystem and allow N fertilization to be reduced without losing productivity, but may also increase nitrous oxide (N2O) emissions. Our main objective was to evaluate the impact of using oats, vetch, and oats+vetch mixture as cover crops on N2O emissions and summer crop yields in a maize–soybean rotation with low N fertilization to maize (32 kg N ha−1) under no-tillage. We also studied how the different cover crops affected soil variables related to N2O emissions. For the treatments that included vetch (vetch and oats+vetch), plots without N fertilization were included to evaluate if N2O emissions and crop yield were increased by low-rate N fertilization after a legume cover crop. We measured N2O emissions using static chambers in a long-term experiment located in the Argentine Pampas. We selected measurement periods in w...
... José Ramón Sánchez-Martín / Aitziber Azurmendi Imaz / Eduardo Fano Ardanaz / Francisco Braza Lloret / José Manuel Muñoz Sánchez / María Rosario ... Mª José Rodrigo López / Juan Camacho Rosales / Mª Luisa Máiquez Chávez / Sonia Byrne /... more
... José Ramón Sánchez-Martín / Aitziber Azurmendi Imaz / Eduardo Fano Ardanaz / Francisco Braza Lloret / José Manuel Muñoz Sánchez / María Rosario ... Mª José Rodrigo López / Juan Camacho Rosales / Mª Luisa Máiquez Chávez / Sonia Byrne / José Manuel Benito Cruz. ...
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... José Ramón Sánchez-Martín / Aitziber Azurmendi Imaz / Eduardo Fano Ardanaz / Francisco Braza Lloret / José Manuel Muñoz Sánchez / María Rosario ... Mª José Rodrigo López / Juan Camacho Rosales / Mª Luisa Máiquez Chávez / Sonia Byrne /... more
... José Ramón Sánchez-Martín / Aitziber Azurmendi Imaz / Eduardo Fano Ardanaz / Francisco Braza Lloret / José Manuel Muñoz Sánchez / María Rosario ... Mª José Rodrigo López / Juan Camacho Rosales / Mª Luisa Máiquez Chávez / Sonia Byrne / José Manuel Benito Cruz. ...
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This is the FLUXNET2015 version of the carbon flux data for the site AR-Vir Virasoro.
This is the FLUXNET2015 version of the carbon flux data for the site AR-SLu San Luis.
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The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500... more
The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed un...
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Turbulence data measured with fast response instruments at two sites with distinct conditions were available. The ability of a mesoscale model in the simulation of turbulent fluxes and boundary layer height was assessed in case studies... more
Turbulence data measured with fast response instruments at two sites with distinct conditions were available. The ability of a mesoscale model in the simulation of turbulent fluxes and boundary layer height was assessed in case studies covering periods in the Southern Hemisphere summer and winter. The energy apportionment at both locations was properly reproduced. In summer, at the site with native forest, the sensible heat flux was well estimated and the latent heat flux was underestimated. At the other site (commercial plantation) the sensible heat flux was properly represented and the latent heat flux was slightly overestimated. In winter, the best results were obtained at the implanted forest site. The performance of the model at the native forest site was very satisfactory when homogeneous initial soil moisture was considered. A model intercomparison between the boundary layer height obtained with an analytical model and the mesoscale model showed the influence of data and methodologies used in the two approaches.
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ABSTRACT RESUMEN El objetivo de este trabajo fue cuantificar los cambios en la eficiencia de una pastura debidos a la fertilización y a diferente frecuencia de pastoreo. Se realizó un experimento factorial con dos facto-res: fertilización... more
ABSTRACT RESUMEN El objetivo de este trabajo fue cuantificar los cambios en la eficiencia de una pastura debidos a la fertilización y a diferente frecuencia de pastoreo. Se realizó un experimento factorial con dos facto-res: fertilización y frecuencia de corte En cada parcela experimental se estimó periódicamente la fracción de energía interceptada (fAPAR) y la productividad primaria aérea según la biomasa cose-chada. Teniendo el dato de la radiación incidente (PAR) se estimó la eficiencia. Los valores de µ variaron entre 0.62 y 1.93 g MS/MJ. Los mayores valores correspondieron a las parcelas con cortes más frecuentes. Palabras clave: eficiencia en el uso de la radiación, productividad primaria, pastoreo. ABSTRACT The objective of this work was to quantify the changes in the efficiency of a pasture due to the different fertilization and use intensity. A two factor experiment was made on a pasture: fertilization and cut-off frequency. In each experimental plot we estimated the fraction of intercepted energy (fAPAR) and the aerial primary productivity by means of successive cuts. With the incident radiation (PAR) value the efficiency was estimated. The values varied between 0.62 and 1.93 g MS/MJ. The greater values corresponded to the plots with more frequent cuts.
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Research Interests: Soil sciences and Wiley
A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.
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Se estudio estacionalmente la composicion botanica de la dieta de la llama (Lama glama) en la estepa magallanica mediante analisis microhistologico de heces. Las gramineas fueron la fraccion mas importante de la dieta a lo largo de todo... more
Se estudio estacionalmente la composicion botanica de la dieta de la llama (Lama glama) en la estepa magallanica mediante analisis microhistologico de heces. Las gramineas fueron la fraccion mas importante de la dieta a lo largo de todo el ano, seguidas por las graminoideas (Cyperaceae y Juncaceae). Poa y Deschampsia fueron los componentes mas importantes. En el verano, las graminoides tuvieron su maximo porcentaje en la dieta, lo que indicaria un alto uso de las vegas (praderas humedas de graminoideas). Los arbustos, consumidos en bajas proporciones, fueron relativamente mas importantes en primavera y verano. La dieta de la llama fue similar a la de los ovinos en la misma zorra. En ambos casos, Festuca gracillima, de baja calidad nutricional, fue poco consumida en relacion a su oferta.
Fil: Posse, Gabriela. Instituto Nacional de Tecnologia Agropecuaria. Centro de Investigacion de Recursos Naturales. Instituto de Clima y Agua; Argentina
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The FLUXNET2015 dataset provides ecosystem-scale data on CO 2 , water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500... more
The FLUXNET2015 dataset provides ecosystem-scale data on CO 2 , water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed ...
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Nitrous oxide (N2O) is the main greenhouse gas emitted from farming systems and is associated with nitrogen (N) fertilizer application as well as decomposition of organic matter present in the environment. The objective of this study was... more
Nitrous oxide (N2O) is the main greenhouse gas emitted from farming systems and is associated with nitrogen (N) fertilizer application as well as decomposition of organic matter present in the environment. The objective of this study was to determine the effect of post-harvest straw burning and synthetic N fertilization on the dynamics of N2O emissions in the sugarcane-soil system in Tucuman, Argentina, compared with a native forest. Close-vented chambers were used to capture N2O during three consecutive growing seasons. The highest N2O emissions from the sugarcane-soil system coincided with the period of high soil and air temperatures, rainfall and soil N content. The effect of synthetic N fertilization on annual cumulative N2O emission was 7.4-61.5% higher in straw burned than in unburned treatments, especially during a wet growing season. There was a significant effect of treatments on N2O emission factors among growing seasons: 0.58-1.67% and 0.94-3.34% in the unburnt and burnt treatments, respectively. The emission factors for sugarcane are highly dependent on rainfall, temperature and crop management practices; regarding the latter, avoiding straw burning and reducing N soil availability, assessing alternative N fertilizers or new application modes such as split rates, seem to be the key for mitigating N2O emissions from the sugarcane-soil system in Tucumán, Argentina.