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El agua en la agricultura Texte intégral
1912
Ruiz de Velasco, Amalio,
El agua en Las Rozas de Madrid Texte intégral
2010
Álvarez Cobelas, Miguel | Cirujano Bracamonte, Santos,, 1950- | Martín Fernández, José Manuel | Moreno Pérez, Miriam
National monuments : Grand Canyon-Parashant National Monument, Agua Fria National Monument Texte intégral
2000
Agua y abonos para mejorar la productividad de la quinua en Lípez Texte intégral
2011
Ticona Muraña, Edgar,
Sobre peces de agua dulce nuevos ó poco conocidos de la República Argentine Texte intégral
1895
Berg, Cárlos,, 1843-1902
Técnicas habituales de análisis físicos, químicos y biológicos del Grupo de Investigación del Agua Texte intégral
2002
Álvarez Cobelas, Miguel | Cirujano Bracamonte, Santos,, 1950- | Ortega Mayagoitia, Elizabeth | Riolobos López, Palmira | Rodrigo Alacreu, María Antonia | Rojo García-Morato, Carmen
Calidad físico-química del agua fluvial en el Parque Regional del Curso Medio del Río Guadarrama (Madrid) Texte intégral
2014
Almendros Martín, Gonzalo | Álvarez Cobelas, Miguel
Los Arboles y la Gente de San Juán Arriba, Agua Zarca, San José de las Conchas y Los Cayotes Texte intégral
1999
BARRANCE, A. AND FLORES, L.
Estimates of Soil Organic Carbon in the Ojos de Agua and El Quinillal Forests in the Central Huallaga of Peru Texte intégral
2024
Karla Mendoza-Lopez | Luis Ordoñez-Sánchez | Manuel Jesús Valdez-Andía | Andi Lozano-Chung | Patricia E. García-Gonzales | Jorge Saavedra-Ramírez | Wilder Macedo-Córdova | Juan R. Baselly-Villanueva | Keneth Reategui | Nery Gaona-Jimenez | Geomar Vallejos-Torres
The Peruvian Amazon has experienced large losses of forest cover due to changes in land use, contributing to increases in CO2 in the atmosphere. This study estimated the organic carbon content of forest soil in two forests “Ojos de Agua” and “El Quinillal” in the Central Huallaga of Peru, establishing three types of cover: (i) primary, (ii) intervened, and (iii) deforested. For this purpose, 24 plots of 100 m2 were established and samples were extracted at a depth of 0–20 cm. The effect of the type of forest cover on soil carbon (Organic Carbon-SOC, Inorganic Carbon-SIC, Saturated Carbon-SC, Critical Carbon-CC, Saturated Carbon Deficit-SCD, and Organic Carbon-OC) was analyzed by means of an Analysis of Variance, correlation. Likewise, the relationship between carbon (C) and soil properties was evaluated by principal component analysis and correlation network. The results indicated that the highest SOC averages were found in the primary forests of Ojos de Agua and El Quinillal with 3.54% and 2.51%. The lowest values were found in the deforested forests with 1.34% and 1.46%. The calculation of the saturated C levels of the soil showed an average of 28.63% ± 2.14% and the saturated carbon deficit of 26.63% ± 2.45%, whereas the critical threshold of C showed an average of 2.21% ± 0.18%. The highest SOC content found in the Ojos de Agua primary forest is due to the presence of dominant forest species such as Manilkara bidentata and Brosimum alicastrum. Likewise, the C deficit in the soils of the study area is very alarming because it is very close to saturation levels, especially in deforested forests.
Afficher plus [+] Moins [-]Los arboles y la gente de San Juán Arriba, Agua Zarca, San José de las Conchas y Los Coyotes: community feedback document Texte intégral
1999
BARRANCE, A.J. | FLORES, L.
