Hydraulic Parameters of Pressure-Volume Curves and Their Relationship with the Moisture Content of Live Fuels in Two Woody Species and an Epiphyte

• DOI: 10.20944/preprints202502.0447.v1
• Publication Date: 2025-02-07T02:38:16Z
• Authors: Fabiola Guerrero ...; Teresa Alfaro Reyna; Josué Delgado Bal...; Francisco Fábian ...; Carlos Alberto Ag...
• Keywords: Epiphyte

Arid and semiarid ecosystems are characterized by substantial water loss through evaporation, exceeding precipitation, which makes scarcity a critical challenge for plant survival. This study examined temporal variations in relations parameters two woody species, Acacia schaffneri Prosopis laevigata, one epiphytic Tillandsia recurvata. The aim was to explore the relationships between hydraulic traits conferring drought tolerance storage capacity, as well derive live fuel moisture content at turgor point. Predawn midday potentials (Ψpd, Ψmd) were measured field, while pressure-volume (P-V) curves used such saturated (SWC), osmotic potential (Πo), point (ΨTLP), relative ΨTLP (RWCTLP), bulk modulus of elasticity (ε), full capacitance (CFT). Significant correlations found CFT (positive), Πo ε (negative). P. laevigata T. recurvata exhibited higher capacities (41.46 26.45 MPa⁻¹, respectively) but had lower ability maintain cell under conditions. In contrast, A. lowest capacity (11.88 MPa⁻¹) demonstrated highest (ΨTLP = -1.31 MPa) superior adjustments (Πo -0.59 MPa). Both rigid walls, whereas displayed greater its structures. observed schaffneri, suggesting fire ignition risk. These findings enhance understanding mechanisms susceptibility arid regions, offering insights into species-specific adaptations stress.