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Leveraging Signatures of Plant Functional Strategies in Wood Density Profiles of African Trees to Correct Mass Estimations From Terrestrial Laser Data.

Abstract：

:Wood density (WD) relates to important tree functions such as stem mechanics and resistance against pathogens. This functional trait can exhibit high intraindividual variability both radially and vertically. With the rise of LiDAR-based methodologies allowing nondestructive tree volume estimations, failing to account for WD variations related to tree function and biomass investment strategies may lead to large systematic bias in AGB estimations. Here, we use a unique destructive dataset from 822 trees belonging to 51 phylogenetically dispersed tree species harvested across forest types in Central Africa to determine vertical gradients in WD from the stump to the branch tips, how these gradients relate to regeneration guilds and their implications for AGB estimations. We find that decreasing WD from the tree base to the branch tips is characteristic of shade-tolerant species, while light-demanding and pioneer species exhibit stationary or increasing vertical trends. Across all species, the WD range is narrower in tree crowns than at the tree base, reflecting more similar physiological and mechanical constraints in the canopy. Vertical gradients in WD induce significant bias (10%) in AGB estimates when using database-derived species-average WD data. However, the correlation between the vertical gradients and basal WD allows the derivation of general correction models. With the ongoing development of remote sensing products providing 3D information for entire trees and forest stands, our findings indicate promising ways to improve greenhouse gas accounting in tropical countries and advance our understanding of adaptive strategies allowing trees to grow and survive in dense rainforests.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Momo ST,Ploton P,Martin-Ducup O,Lehnebach R,Fortunel C,Sagang LBT,Boyemba F,Couteron P,Fayolle A,Libalah M,Loumeto J,Medjibe V,Ngomanda A,Obiang D,Pélissier R,Rossi V,Yongo O,PREREDD Collaborators.,Sonké B,Barbier N

doi

10.1038/s41598-020-58733-w

subject

Has Abstract

pub_date

2020-02-06 00:00:00

pages

2001

issue

issn

2045-2322

pii

10.1038/s41598-020-58733-w

journal_volume

pub_type

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Leveraging Signatures of Plant Functional Strategies in Wood Density Profiles of African Trees to Correct Mass Estimations From Terrestrial Laser Data.