BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
<p class="Default">This work is an empiric – theory revision which evidences the existence of two irrigation sectors in the Andean countries: a formal one, mainly located in plain low lands, controlled by the government, mostly directed to agribusiness producers and, in a smaller proportion, to small holders; the other sector, informal irrigation, is directly managed by the producers, usually family farmers, without government control and without being reported in national statistics; this second sector is principally located in the Andean mountains. Nowadays there are several institutions for the access to water which are associated to different stakeholders, so conflicts between different kinds of users emerge.</p>
ResumenEl 12.8% de la superficie de Colombia corresponde a áreas naturales protegidas, pertenecientes al Sistema de Parques Nacionales Naturales. Dentro de éstas se desarrollan actividades antrópicas que utilizan agua dulce. Se presenta la primera caracterización del uso y aprovechamiento del recurso hídrico al interior de tales áreas protegidas, mediante la cual se pretende establecer la relación entre el estado y la gestión del recurso y las zonas de estudio, teniendo en cuenta la presión ejercida sobre las fuentes hídricas en cuestión, considerando la dualidad ofertademanda de las mismas. Se obtuvo información de 22 variables cualitativas y cuatro variables cuantitativas del total de áreas protegidas continentales de Colombia; se trataron a través de un análisis de correspondencias múltiples, que incorpora aspectos geográficos, ambientales y estructurales. El estudio revela, entre otros aspectos, que si bien hay diferencias entre cada región del país, actualmente casi 88%
Índice de calidad del suelo en fincas convencionales y semi-ecológicas productoras de plátano (Musa AAB simmonds cv. Dominic Harton) en Anolaima-Cundinamarca, Colombia AbstractThis research aimed to generate a soil quality index which have allowed to compare the effect of conventional and semi-ecological plantain farming systems. For its construction, we considered biometric data of near-to-harvest plants, physical, chemical and biological indicators which were evaluated using a principal components analysis; the weight of each indicator was calculated, and so were the response curves, establishing a minimum set of data which includes: sand percentage, sheet of water, pH, Nitrogen, organic carbon percentage, potassium, biodiversity conservation and microbial respiration, respectively. In fact, this index was validated in areas cultivated with plantain cv. Dominic Harton in farms located in the same taxonomic unit in Anolaima-Cundinamarca, Colombia. Results indicate that farms with semi-ecological practices had achieved a better soil quality than those with conventional practices.Key words: agriculture, alternative agriculture, indexes, agricultural practices, soil. ResumenEl objetivo de esta investigación es generar un índice de calidad del suelo que permita comparar el efecto de sistemas de producción de plátano convencionales y semi-ecológicos. Para su construcción se consideraron datos biométricos de plantas cercanas a la cosecha, indicadores físicos, químicos y biológicos que fueron evaluados a través de un análisis de componentes principales; se calculó el peso de cada indicador y además se establecieron las curvas de respuesta, estableciendo un Conjunto Mínimo de Datos, del cual hacen parte: porcentaje de arena, lámina de agua, pH, Nitrógeno, porcentaje de carbono orgánico, Potasio, conservación de la biodiversidad y la respiración microbiana. Este índice se validó en áreas cultivadas con plátano Dominico Hartón en fincas ubicadas en la misma unidad taxonómica en Anolaima, Colombia. Los resultados indican que las fincas que realizan prácticas semi-ecológicas presentan una mejor calidad de suelo que aquellas cuyo manejo es de tipo convencional.
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