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Diversity in plant hydraulic traits explains seasonal and inter‐annual variations of vegetation dynamics in seasonally dry tropical forests

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.14009· OSTI ID:1401212
 [1];  [1];  [2];  [3];  [4]
  1. Department of Geosciences Princeton University Princeton NJ 08544 USA
  2. Departments of Ecology Evolution &, Behavior and Plant Biology University of Minnesota Twin Cities Minneapolis MN 55108 USA
  3. Department of Ecology &, Evolutionary Biology Brown University Providence RI 02912 USA
  4. Department of Natural Resources and Environmental Sciences University of Illinois at Urbana Champaign Urbana IL 61801 USA
Summary

We assessed whether diversity in plant hydraulic traits can explain the observed diversity in plant responses to water stress in seasonally dry tropical forests ( SDTF s).

The Ecosystem Demography model 2 ( ED 2) was updated with a trait‐driven mechanistic plant hydraulic module, as well as novel drought‐phenology and plant water stress schemes. Four plant functional types were parameterized on the basis of meta‐analysis of plant hydraulic traits. Simulations from both the original and the updated ED 2 were evaluated against 5 yr of field data from a Costa Rican SDTF site and remote‐sensing data over Central America.

The updated model generated realistic plant hydraulic dynamics, such as leaf water potential and stem sap flow. Compared with the original ED 2, predictions from our novel trait‐driven model matched better with observed growth, phenology and their variations among functional groups. Most notably, the original ED 2 produced unrealistically small leaf area index ( LAI ) and underestimated cumulative leaf litter. Both of these biases were corrected by the updated model. The updated model was also better able to simulate spatial patterns of LAI dynamics in Central America.

Plant hydraulic traits are intercorrelated in SDTF s. Mechanistic incorporation of plant hydraulic traits is necessary for the simulation of spatiotemporal patterns of vegetation dynamics in SDTF s in vegetation models.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0014363
OSTI ID:
1401212
Alternate ID(s):
OSTI ID: 1536762
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 1 Vol. 212; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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