Yadvinder Malhi
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Archive | 2018
Martin J. P. Sullivan; Simon L. Lewis; Wannes Hubau; Lan Qie; Timothy R. Baker; Lindsay Banin; Jérôme Chave; Aida Cuni Sanchez; Ted R. Feldpausch; Gabriela Lopez-Gonzalez; E.J.M.M. Arets; Peter S. Ashton; Jean-François Bastin; Nicholas J. Berry; Jan Bogaert; Rene G. A. Boot; Francis Q. Brearley; Roel J. W. Brienen; David F. R. P. Burslem; Charles De Cannière; Markéta Chudomelová; Martin Dančák; Corneille Ewango; Radim Hédl; Jon Lloyd; Jean-Remy Makana; Yadvinder Malhi; Beatriz Schwantes Marimon; Ben Hur Marimon Junior; Faizah Metali
1. Quantifying the relationship between tree diameter and height is a key component of efforts to estimate biomass and carbon stocks in tropical forests. Although substantial site-to-site variation in height-diameter allometries has been documented, the time consuming nature of measuring all tree heights in an inventory plot means that most studies do not include height, or else use generic pan-tropical or regional allometric equations to estimate height. 2. Using a pan-tropical dataset of 73 plots where at least 150 trees had in-field ground-based height measurements, we examined how the number of trees sampled affects the performance of locally-derived height-diameter allometries, and evaluated the performance of different methods for sampling trees for height measurement. 3. Using cross-validation, we found that allometries constructed with just 20 locally measured values could often predict tree height with lower error than regional or climate-based allometries (mean reduction in prediction error = 0.46 m). The predictive performance of locally-derived allometries improved with sample size, but with diminishing returns in performance gains when more than 40 trees were sampled. Estimates of stand-level biomass produced using local allometries to estimate tree height show no over- or under-estimation bias when compared with estimates using measured heights. We evaluated five strategies to sample trees for height measurement, and found that sampling strategies that included measuring the heights of the ten largest diameter trees in a plot outperformed (in terms of resulting in local height-diameter models with low height prediction error) entirely random or diameter size-class stratified approaches. 4. Our results indicate that even remarkably limited sampling of heights can be used to refine height-diameter allometries. We recommend aiming for a conservative threshold of sampling 50 trees per location for height measurement, and including the ten trees with the largest diameter in this sample.
Frontiers in Forests and Global Change | 2018
Benjamin Blonder; Sabine Both; David A. Coomes; Dafydd M.O. Elias; Tommaso Jucker; Jakub Kvasnica; Noreen Majalap; Yadvinder Malhi; David T. Milodowski; Terhi Riutta; Martin Svátek
Microclimate within forests influences ecosystem fluxes and demographic rates. Anthropogenic disturbances such as selective logging can affect within-forest microclimate through effects on forest structure, leading to indirect effects on forests beyond the immediate impact of logging. However, the scope and predictability of these effects remains poorly understood. Here we use a microclimate thermal proxy (sensitive to radiative, convective, and conductive heat fluxes) measured at the forest floor in three 1-ha forest plots spanning a logging intensity gradient in Malaysian Borneo. We show 1) that thermal proxy ranges and spatiotemporal heterogeneity are doubled between old growth and heavily logged forests, with extremes often exceeding 45°C, 2) that nearby weather station air temperatures provide estimates of maximum thermal proxy values that are biased down by 5-10°C, and 3) that lower canopy density, higher canopy height, and higher biomass removal are associated with higher maximum temperatures. Thus, logged forests are less buffered from regional climate change than old growth forests, and experience much higher microclimate extremes and heterogeneity. Better predicting the linkages between regional climate and its effects on within-forest microclimate will be critical for understanding the wide range of conditions experienced within tropical forests.
Archive | 2009
Joshua B. Fisher; Yadvinder Malhi; Damien Bonal; H. R. da Rocha; Ac De Araújo; Minoru Gamo; Michael L. Goulden; Th Rano; Alfredo R. Huete; Hiroaki Kondo; Tomo’omi Kumagai; Henry W. Loescher; Scott N. Miller; Antonio Donato Nobre; Yann Nouvellon; Steven F. Oberbauer; Samreong Panuthai; Olivier Roupsard; Scott R. Saleska; Katsunori Tanaka; Nobuaki Tanaka; Kevin P. Tu; C. von Randow
Journal of Ecology | 2007
Ingrid Parmentier; Yadvinder Malhi; Bruno Senterre; Robert J. Whittaker; Alfonso Alonso; Michael P.B. Balinga; Adama Bakayoko; F. Bongers; Cyrille Chatelain; James A. Comiskey; Renaud Cortay; Marie‐Noël Djuikouo Kamdem; Jean-Louis Doucet; Laurent Gautier; William D. Hawthorne; Yves A. Issembe; François N. Kouamé; Lazare A. Kouka; Miguel E. Leal; Jean Lejoly; Simon L. Lewis; Louis Nusbaumer; Marc P. E. Parren; Kelvin S.-H. Peh; Oliver L. Phillips; Douglas Sheil; Bonaventure Sonké; Marc S. M. Sosef; Terry Sunderland; Juliana Stropp
Tha carbon balance of forest biomes / Griffiths, H. [edit.] | 2005
P. Ciais; Ivan A. Janssens; A. Shvidenko; Christian Wirth; Yadvinder Malhi; John Grace; E.-D. Schulze; Martin Heimann; Oliver L. Phillips; H. Dolman
Biogeosciences Discussions | 2008
S. Patiño; J. Lloyd; R. Paiva; Carlos A. Quesada; Timothy R. Baker; Arsénio Santos; Lina M. Mercado; Yadvinder Malhi; Oliver L. Phillips; Alejandra Aguilar; Esteban Álvarez; L. Arroyo; Damien Bonal; Alcina Costa; Claudia I. Czimczik; J. Gallo; Rafael Herrera; Niro Higuchi; Viviana Horna; E.J. Hoyos; Elena Jimenez; Timothy J. Killeen; E. Leal; Flávio J. Luizão; Patrick Meir; Abel Monteagudo; David A. Neill; P. Núñez-Vargas; W. Palomino; J. Peacock
Biogeosciences Discussions | 2012
Manuel Gloor; Luciana V. Gatti; Roel J. W. Brienen; Ted R. Feldpausch; Oliver L. Phillips; J. B. Miller; Jean Pierre Henry Balbaud Ometto; H. Ribeiro da Rocha; Timothy R. Baker; R. A. Houghton; Yadvinder Malhi; Luis E. O. C. Aragão; Jean-Loup Guyot; Kaiguang Zhao; Robert B. Jackson; P. Peylin; Stephen Sitch; Ben Poulter; M. Lomas; Soenke Zaehle; Chris Huntingford; J. Lloyd
In: Bush, M and Flenley, J, (eds.) Tropical Rain Forest Responses to Climate Change. (pp. 317-332). Springer-Praxis: London. (2006) | 2007
Oliver L. Phillips; Simon L. Lewis; Timothy R. Baker; Yadvinder Malhi
SEB experimental biology series | 2005
P. Ciais; Ivan A. Janssens; A. Shvidenko; Christian Wirth; Yadvinder Malhi; John Grace; E.-D. Schulze; Martin Heimann; Oliver L. Phillips; A. J. Dolman
In: Tropical Forests and Global Atmospheric Change. (2007) | 2007
Timothy R. Baker; Oliver L. Phillips; Yadvinder Malhi; S. Almeida; L. Arroyo; A. Di Fiore; Terry L. Erwin; Niro Higuchi; Timothy J. Killeen; Susan G. Laurance; William F. Laurance; Simon L. Lewis; Abel Monteagudo; David A. Neill; Percy Núñez Vargas; Nca Pitman; Jnm Silva; Rodolfo Vásquez Martínez