867 resultados para Minería a Cielo Abierto


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7 hojas : ilustraciones, fotografías a color

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10 hojas : ilustraciones, fotografías

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During twao years soil and litter pH of 31 permanent plots grown by several rock-rose scrubs (jarales) of Cistion laurifolii at different dynamic stages have been measured. Acidily records show the existence of important seasonal variations and according to a certain rythm. The different syntaxa are characterized as for this ecological factor and the results for these matorrals are compared with other data of heath-scrubs. Adult jaral-phases tend to decrease soil pH when compared with younger dwarf-scrubs-phases, nevertheless upper soil levels generally remain less acidic. Multivariable analysis do not show preference of t he different syntaxa for a certain soil-pH range.

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Tesis (Maestría en la Enseñanza de la Ciencia con Especialidad en Química) UANL

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Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Física) U.A.N.L.

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Tesis (Maestría en Ingeniería de la Información con Orientación en Inteligencia Artificial) UANL, 2013.