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Universidad Autónoma de Nuevo León (2013)

Respuesta al déficit hídrico en cuatro especies nativas del matorral espinoso tamaulipeco

López López, Bernardo

Titre : Respuesta al déficit hídrico en cuatro especies nativas del matorral espinoso tamaulipeco

Auteur : López López, Bernardo

Université de soutenance : Universidad Autónoma de Nuevo León

Grade : Maestría en Ciencias Forestales UANL, 2013.

Résumé
Water deficit is one of the most limiting abiotic factors in the northeastern Mexico. The present study aimed to determine the water potential () of native shrub species such as Amyris texana (Rutaceae), Bumelia celastrina (Sapotaceae), Cordia boissieri (Boraginaceae) and Leucophyllum frutescens (Scrophulariaceae) and related the moinsture content in the soil, the atmospheric evaporative demand components and precipitation. The study was conducted at the Experimental Research Station of the Faculty of Forest Sciences, UANL, located in Linares county, state of Nuevo Leon. The were determined at intervals of 15 days from January 17 to October 31, 2011, at 06:00 h (pd ; predawn) and 14:00 h (md ; midday). Cumulative rainfall recorded at the site was 502.40 mm. During the wettest period,  ranged from 0.40 MPa (B. celastrina) to -0.92 MPa (L. frutescens). With respect to pd during the driest period, it varied from -1.86 MPa (L. frutescens) to -4.0 MPa (A. texana). In contrast, md during the wettest period ranged from -1.08 MPa (C. boissieri) to -1.56 MPa (A. texana), while during the driest period ranged from 2.0 MPa (L. frutescens) to -4.0 MPa (A. texana). Diurnal  showed maximum values at dawn, and then decreased gradually to minimum values at midday and in the afternoon it recovered. On a seasonal basis, pd and md was positively correlated with soil water content and negatively correlated with air temperature, however, no correlation was detected with relative humidity and precipitation. Diurnal  was negatively correlated with air temperature and vapor pressure deficit, whereas, relative humidity showed a positive correlation. pd explained 74% of the total variability md. Since B. celastrina, C. boissieri and L. frutescens showed high pd and md during water stress conditions with respect to A. texana, these species are considered tolerant to water shortage induced by drought.

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