Data from: Predicting climatic limits along a rainfall gradient of dipterocarp species based on leaf turgor loss point
Data files
Apr 10, 2025 version files 28.93 KB
Abstract
Drought tolerance is an integral determinant of drought survival in trees; thus, an accurate and rapid assessment of drought tolerance can lead to improved prediction of forest responses to droughts. The osmometer method enables the rapid determination of the leaf water potential at turgor loss (πtlp), a key parameter of drought tolerance, from the osmotic potential at full turgor (πsat). However, despite its wide applications, there have been few validations in ever-wet tropical rainforests. Here, we assessed the efficacy of the osmometer method in dipterocarps, a dominant tree group in SE Asia in ever-wet Malaysia, and examined the linkage between πtlp and distribution along a rainfall gradient. The πtlp determined using conventional method was strongly and linearly correlated with the πsat determined using an osmometer. The coefficients of our model were statistically identical to those previously represented, but with a slightly larger intercept (0.21 MPa). Species with more negative πtlp were distributed in drier habitats, with a relatively larger variation in πtlp for species confined to ever-wet climates than for those occurring in ever-wet and seasonally dry climates. Some leaf traits, individual leaf area and dry matter content, were associated with πtlp, but these traits alone could not predict species distribution. We demonstrated the robustness of osmometer method in ever-wet tropical rainforest species and that πtlp is associated with current distribution along large-scale moisture availabilities.
Dataset DOI: 10.5061/dryad.9s4mw6mtc
Description of the data and file structure
This dataset represents complete data used in this paper.
Files and variables
Files:
・230325data_Kawai_et_al_Biotropica_πsat_osm.csv
・080425data_Kawai_et_al_Biotropica_P-Vcurve_and_other_traits_rev.csv
・230325data_Kawai_et_al_Biotropica_Species_distribution.csv
Description:
“n/a” indicates no data.
Variables
- Species: name of species
- Individual: identity of individual within species
- Leaf: identity of leaf within individual
- πsat_osm: osmotic potential at full turgor estimated from an osmometer. Unit in MPa.
- πsat: osmotic potential at full turgor estimated from a pressure-volume curve. Unit in MPa.
- πtlp: leaf water potential at turgor loss. Unit in MPa.
- RWCtlp: relative water content at turgor loss. No units.
- af: apoplastic water fraction. No units.
- ε: modulus of elasticity. Unit in MPa.
- Cleaf: leaf hydraulic capacitance. Unit in mol m^-2 MPa^-1.
- LMA: leaf dry mass per area. Unit in g m^-2.
- LDMC: leaf dry matter content. Unit in g g^-1.
- LA: individual leaf area. Unit in cm^2.
- MAP5th: 5th percentile of the mean annual rainfall. Unit in mm.
- MAP50th: 50th percentile of the mean annual rainfall. Unit in mm.
- MAP95th: 95th percentile of the mean annual rainfall. Unit in mm.
- MPD5th: 5th percentile of the mean precipitation of the driest month. Unit in mm.
- MPD50th: 50th percentile of the mean precipitation of the driest month. Unit in mm.
- MPD95th: 95th percentile of the mean precipitation of the driest month. Unit in mm.