ORCID Profile
0000-0002-5492-2874
Current Organisation
Sylvera LTD
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Publisher: Wiley
Date: 31-08-2021
DOI: 10.1111/GEB.13382
Abstract: Elevational gradients provide excellent opportunities to explore long‐term morphological and physiological responses of plants to environmental change. We determined the difference in the elevational pattern of foliar carbon isotope composition (δ 13 C) between lianas and trees, and assessed whether this difference arises from changes in photosynthesis or stomatal conductance. We also explored the pattern of nutrient limitations with the elevation of these two growth forms. The study was conducted in two mountain forests situated in the Neotropics and Palaeotropics. August–September 2015 and August–October 2016. Lianas and trees. We conducted inventories of lianas and trees using standardized techniques along elevational gradients in Ecuador and Rwanda. We determined the values of several foliar traits including δ 13 C and chemical traits in dominant liana and tree species. We set up Bayesian linear mixed‐effect models to quantify the effects of elevation and growth form on each of the foliar traits , and the difference of the effect of elevation between the two growth forms (lianas and trees). We found consistent growth form specific ergences in foliar δ 13 C and carbon to nitrogen ratio (C : N) responses to elevation. While we noted a meaningful increase in foliar δ 13 C and C : N with elevation for trees, lianas did not exhibit such a trend. Foliar δ 13 C and C : N remained relatively constant for lianas along the transects. Lianas operate at relatively constant intrinsic water‐ and nitrogen‐use efficiencies with elevation compared with trees. Altogether, the study suggests the existence of a functional ergence of water and nutrient use strategies between lianas and trees along tropical elevational transects.
Publisher: Wiley
Date: 09-06-2022
Abstract: Improving the global monitoring of above‐ground biomass (AGB) is crucial for forest management to be effective in climate mitigation. In the last decade, methods have been developed for estimating AGB from terrestrial laser scanning (TLS) data. TLS‐derived AGB estimates can address current uncertainties in allometric and Earth observation (EO) methods that quantify AGB. We assembled a global dataset of TLS scanned and consecutively destructively measured trees from a variety of forest conditions and reconstruction pipelines. The dataset comprised 391 trees from 111 species with stem diameter ranging 8.5 to 180.3 cm and AGB ranging 13.5–43,950 kg. TLS‐derived AGB closely agreed with destructive values (bias %, concordance correlation coefficient of 98%). However, we identified below‐average performances for smaller trees ( ,000 kg) and conifers. In every in idual study, TLS estimates of AGB were less biased and more accurate than those from allometric scaling models (ASMs), especially for larger trees ( ,000 kg). More effort should go to further understanding and constraining several TLS error sources. We currently lack an objective method of evaluating point cloud quality for tree volume reconstruction, hindering the development of reconstruction algorithms and presenting a bottleneck for tracking down the error sources identified in our synthesis. Since quantifying AGB with TLS requires only a fraction of the efforts as compared to destructive harvesting, TLS‐calibrated ASMs can become a powerful tool in AGB upscaling. TLS will be critical for calibrating/validating scheduled and launched remote sensing initiatives aiming at global AGB mapping.
Publisher: Elsevier BV
Date: 12-2020
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Miro Demol.