El propósito fundamental de la tesis está dirigido cuantificar la biomasa que aportan los nutrientes que se reciclan en los Sistemas agroforestales y que en la actualidad, la creciente demanda por sistemas de producción más sostenibles y amigables con el ambiente, conlleva a la generación y validación de información que permita desarrollar pautas y/o criterios para maximizar el aprovechamiento de los recursos disponibles. El estudio fue realizado en dos predios bajo manejo agroforestal en la provincia de Huaraz en el Distrito de Jangas, escogidos bajo el muestreo selectivo, bajo el supuesto de que el aporte de nutrientes de las especies estudiadas confieren sostenibilidad a los ecosistemas agrícolas. Para el nitrógeno se utilizó el método Kjeldahl, para el fósforo el método colorimétrico, para el potasio, calcio, magnesio, fierro, cobre, zinc y manganeso se utilizó el mét...

This paper aims to determine the concentrations of heavy metals, specifically, arsenic, cadmium, copper, chromium, manganese, mercury, nickel, lead and zinc; in Auqui and Paria rivers in Ancash, Peru and compare it with the permissible maximum established limits by the World Health Organization (WHO) region.In order to obtain representative samples, a sampling plan in time and space was designed, that is, in each of the four (4) seasons (winter, spring, summer and fall) samples points were taken at five (5) (1000 m and 500 m upstream of the point of collection, the collection point at the entrance and exit of the treatment plant) in three (3) times (beginning, middle and end of the season). The response indicates that the Auqui River manganese concentration is above the maximum allowed limit (0,5 mg/L) and the Paria Riverthere is evidence that lead to think that heavy metal concentration...

This paper aims to determine the concentrations of heavy metals, specifically, arsenic, cadmium, copper, chromium, manganese, mercury, nickel, lead and zinc; in Auqui and Paria rivers in Ancash, Peru and compare it with the permissible maximum established limits by the World Health Organization (WHO) region.In order to obtain representative samples, a sampling plan in time and space was designed, that is, in each of the four (4) seasons (winter, spring, summer and fall) samples points were taken at five (5) (1000 m and 500 m upstream of the point of collection, the collection point at the entrance and exit of the treatment plant) in three (3) times (beginning, middle and end of the season). The response indicates that the Auqui River manganese concentration is above the maximum allowed limit (0,5 mg/L) and the Paria Riverthere is evidence that lead to think that heavy metal concentration...

El presente trabajo tiene como propósito determinar las concentraciones de metales pesados, específicamente, Arsénico, Cadmio, Cobre, Cromo, Manganeso, Mercurio, Níquel, Plomo y Zinc; en los ríos Auqui y Paria, en la región Ancash, Perú y compararlo con los límites máximos permisibles, establecidos, por la Organización Mundial de la Salud (OMS).A objeto de obtener muestras representativas, se diseñó un plan de muestreo en espacio y tiempo, esto es, en cada una de las cuatro (4) estaciones (invierno, primavera, verano y otoño) se tomaron muestras en cinco (5) puntos (1000 m y 500 m aguas arriba del punto de captación, en el punto de captación, a la entrada y a la salida de la planta de tratamiento) en tres (3) momentos (inicio, intermedio y fin de la estación).La respuesta obtenida indica que en el Río Auqui la concentración de Manganeso está por encima del límite máx...

This paper aims to determine the concentrations of heavy metals, specifically, arsenic, cadmium, copper, chromium, manganese, mercury, nickel, lead and zinc; in Auqui and Paria rivers in Ancash, Peru and compare it with the permissible maximum established limits by the World Health Organization (WHO) region.In order to obtain representative samples, a sampling plan in time and space was designed, that is, in each of the four (4) seasons (winter, spring, summer and fall) samples points were taken at five (5) (1000 m and 500 m upstream of the point of collection, the collection point at the entrance and exit of the treatment plant) in three (3) times (beginning, middle and end of the season). The response indicates that the Auqui River manganese concentration is above the maximum allowed limit (0,5 mg/L) and the Paria Riverthere is evidence that lead to think that heavy metal concentration...