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Universidad Autónoma de Nuevo León (2013)

Propiedades hidrológicas de un fragmento de matorral espinoso tamaulipeco en el Noreste de México

Yáñez Díaz, María Inés

Titre : Propiedades hidrológicas de un fragmento de matorral espinoso tamaulipeco en el Noreste de México.

Auteur : Yáñez Díaz, María Inés

Université de soutenance : Universidad Autónoma de Nuevo León

Grade : Maestría en Ciencias Forestales UANL, 2013

Résumé
Rainfall interception by canopies in arid and semiarid ecosystems is very important due to irregular and / or shortage of rainfall. Hydrologic property measurements of Tamaulipan thornscrub (MET) were carried out from September 18th 2011 to December 04th 2012. The analysis of 56 rain events totaled 749.8 mm, where 84% of the rains were less than 25 mm (47 events). Throughfall corresponded to 61.7% of the gross precipitation, where the amount of rain that passes through the canopy presented a close relationship with the rain on the canopy with a coefficient of determination of R2 = 0.9744. Spatial variability of throughfall showed a coefficient of variation of 28.8%. Canopy storage capacity values were estimated from 0.17 mm. The stemflow accounted for 1.0% of effective rainfall, while interception loss of rain represented 37.7% of total incident precipitation, playing an important role in water resources in these ecosystems, the vegetation showed that, Diospyros texana and Havardia pallens species were the most frequent with importance value index (IVI) of 48.25 and 36.2%, respectively, plus an alpha diversity according to Shannon index H ’= 2.46. The analysis of pH leaching rain presented a value of 7.42 gross precipitation decreasing 7.21 and 6.95 for the throughfall and stemflow, respectively. While for electrical conductivity a chemical change is present with 71.7 µS cm-1 for gross precipitation, doubling that value when precipitation flowed through the canopy of the MET

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