Florian Hofhansl

Tropical Ecosystem Research


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Terrestrial light detection and ranging for estimating tropical vegetation biomass

Our article entitled “Performance of Laser-Based Electronic Devices for Structural Analysis of Amazonian Terra-Firme Forests” was recently published in the section “Remote Sensing Techniques for Precision Forestry” a special issue of the journal Remote Sensing (Remote Sens. 2019, 11(5), 510; doi: 10.3390/rs11050510)

Novel in situ remote sensing techniques may provide nondestructive alternative approaches to derive biomass estimates for tropical forest ecosystems. We report error metrics for measurements of tree diameter and tree height and show that estimates of aboveground biomass are in good agreement (<10% measurement uncertainty) with traditional measurements. We quantify total and systematic errors among measurements obtained from laser-based electronic devices and conclude that terrestrial light detection and ranging (LiDAR) can complement conventional measurement techniques, thus improving biomass estimates for tropical forest ecosystems.

Terrestrial laser scan of tropical vegetation structure

Please also check out this amazing animation as well as the article entitled “Performance of laser-based electronic devices for structural analysis of Amazonian terra-firme forests” published in a Special Issue “Remote Sensing Techniques for Precision Forestry” in the journal Remote Sensing.


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Biologische Globalisierung bedroht entlegene Inseln

Anzahl an Neobiota auf Inseln steigt mit der Entfernung zum Festland

Je weiter eine Insel vom Festland entfernt ist, desto weniger heimische Tier- und Pflanzenarten, aber desto mehr vom Menschen eingeschleppte Arten – sogenannte Neobiota – beherbergt sie. Zu diesem überraschenden Ergebnis kommt ein internationales Forschungsteam vom Department für Botanik und Biodiversitätsforschung der Universität Wien in der aktuellen Ausgabe der renommierten Fachzeitschrift “PNAS”.

Blick auf die malerischen Rainbow Falls nahe der Stadt Hilo auf Big Island/Hawaii. Alle Pflanzen in unmittelbarer Umgebung sind nicht-heimisch (© Holger Kreft).

Weiterlesen auf dem Blogeintrag zum press release der Universität Wien


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Upcoming below-ground field-campaign

We have still limited understanding of the mechanisms that shape the immense functional diversity and species richness of plants in tropical ecosystems. Such knowledge gaps hinder our ability to evaluate the impact that deforestation and soil degradation may have on forest regeneration and soil conservation. Our goal in this study is to highlight the importance of belowground processes in maintaining crucial ecosystem functions by investigating relationships among evolutionary phylogeny, morphological and physiological root traits and mycorrhizal associations in relation to soil nutrient availability in an integrated framework.

Overview

We aim to create the first curated collection of fine roots from tropical systems that will be accessible via an online library to the scientific community as well as to the general public. We therefore expect that this investigation will fill an important gap in root ecology by providing invaluable information about (1) how tropical trees are able to maintain efficient nutrient acquisition, (2) root functional traits present in tropical areas, and (3) resulting implications for management of forest regeneration and soil degradation under future scenarios.

Check out the video of the campaign here


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ClimMani Workshop 9-11 October 2017

Global change effects on terrestrial ecosystems across spatial and temporal scales: gradients, experiments, remote sensing & models

It has been a very informative and interesting conference meeting including exciting excursions, hosted at the conference center Kaap Doorn, Doorn, the Netherlands

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Rien Aerts describing the ecology of the peat swamp and showing Sphagnum specimens to the audience (while keeping his feet above the water line).