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Price CA, Drake P, Veneklaas EJ, Renton M. Flow similarity, stochastic branching, and quarter-power scaling in plants. PLANT PHYSIOLOGY 2022; 190:1854-1865. [PMID: 35920766 PMCID: PMC9614476 DOI: 10.1093/plphys/kiac358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
The origin of allometric scaling patterns that are multiples of one-fourth has long fascinated biologists. While not universal, quarter-power scaling relationships are common and have been described in all major clades. Several models have been advanced to explain the origin of such patterns, but questions regarding the discordance between model predictions and empirical data have limited their widespread acceptance. Notable among these is a fractal branching model that predicts power-law scaling of both metabolism and physical dimensions. While a power law is a useful first approximation to some data sets, nonlinear data compilations suggest the possibility of alternative mechanisms. Here, we show that quarter-power scaling can be derived using only the preservation of volume flow rate and velocity as model constraints. Applying our model to land plants, we show that incorporating biomechanical principles and allowing different parts of plant branching networks to be optimized to serve different functions predicts nonlinearity in allometric relationships and helps explain why interspecific scaling exponents covary along a fractal continuum. We also demonstrate that while branching may be a stochastic process, due to the conservation of volume, data may still be consistent with the expectations for a fractal network when one examines sub-trees within a tree. Data from numerous sources at the level of plant shoots, stems, and petioles show strong agreement with our model predictions. This theoretical framework provides an easily testable alternative to current general models of plant metabolic allometry.
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Affiliation(s)
| | - Paul Drake
- School of Biological Sciences, University of Western Australia, Perth, Western Australia 6009, Australia
- School of Agriculture and Environment, University of Western Australia, Perth, Western Australia 6009, Australia
- Centre of Excellence for Climate Change, Woodland and Forest Health, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Erik J Veneklaas
- School of Biological Sciences, University of Western Australia, Perth, Western Australia 6009, Australia
- School of Agriculture and Environment, University of Western Australia, Perth, Western Australia 6009, Australia
- Centre of Excellence for Climate Change, Woodland and Forest Health, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Michael Renton
- School of Biological Sciences, University of Western Australia, Perth, Western Australia 6009, Australia
- School of Agriculture and Environment, University of Western Australia, Perth, Western Australia 6009, Australia
- Centre of Excellence for Climate Change, Woodland and Forest Health, University of Western Australia, Perth, Western Australia 6009, Australia
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NeSmith JE, Twine W, Holdo RM. Interspecific variation in post‐disturbance growth responses of a savanna tree community and its implications for escaping the fire trap. Biotropica 2021. [DOI: 10.1111/btp.12936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | - Wayne Twine
- School of Animal Plant and Environmental Sciences University of the Witwatersrand Johannesburg South Africa
| | - Ricardo M. Holdo
- Odum School of Ecology University of Georgia Athens GA USA
- School of Animal Plant and Environmental Sciences University of the Witwatersrand Johannesburg South Africa
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Ouédraogo S, Ouédraogo O, Dimobe K, Thiombiano A, Boussim JI. Prediction of aboveground biomass and carbon stock of Balanites aegyptaca, a multipurpose species in Burkina Faso. Heliyon 2020; 6:e04581. [PMID: 32793827 PMCID: PMC7408327 DOI: 10.1016/j.heliyon.2020.e04581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 05/18/2020] [Accepted: 07/28/2020] [Indexed: 11/30/2022] Open
Abstract
Balanites aegyptiaca (L.) Delile is native to semi-arid regions in Africa where it is a well-known and conspicuous component of savannas. The species is highly preferred by local people because of its high socio-economic, cultural and ecological values. However, the species faces multiple environmental challenges such as desertification and human pressure. This study aimed to develop allometric models to predict aboveground biomass (AGB) of B. aegyptiaca in two climatic zones in Burkina Faso. Overall, thirty trees were sampled using destructive method in six study stands along two climatic zones. We assessed the biomass allocation to the different components of trees by computing its fraction. Furthermore, allometric models based on diameter at breast height (dbh) and basal diameter at 20 cm height (D20) were fitted separately as well as combined with crown diameter (CD) and/or tree total height (Ht). For each biomass component, non-linear allometric models were fitted. Branch biomass accounted for 64% of the AGB in the two climatic zones and increased with dbh. No significant difference in carbon content was found. However, biomass allotment (except leaves) varied across climatic zones. Although both dbh and D20 are typically used as independent variables for predicting AGB, the inclusion of the height in the equations did not significantly improve the statistical fits for B. aegyptica. However, adding CD to dbh improved significantly the equations only in the Sudano-Sahelian zone. The established allometric models can provide reliable and accurate estimation of individual tree biomass of the species in areas of similar conditions and may contribute to relevant ecological and economical biomass inventories.
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Affiliation(s)
- Sambo Ouédraogo
- Laboratory of Plant Biology and Ecology, University Joseph Ki-Zerbo, 03 BP 7021 Ouagadougou 03, Burkina Faso
| | - Oumarou Ouédraogo
- Laboratory of Plant Biology and Ecology, University Joseph Ki-Zerbo, 03 BP 7021 Ouagadougou 03, Burkina Faso
| | - Kangbéni Dimobe
- Laboratory of Plant Biology and Ecology, University Joseph Ki-Zerbo, 03 BP 7021 Ouagadougou 03, Burkina Faso
- West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), Competence Center, Avenue Muamar Khadhafi, Ouagadougou BP, 9507, Burkina Faso
- Institut des Sciences de l’Environnement et du Développement Rural, Université de Dédougou, BP 176 Dédougou, Burkina Faso
| | - Adjima Thiombiano
- Laboratory of Plant Biology and Ecology, University Joseph Ki-Zerbo, 03 BP 7021 Ouagadougou 03, Burkina Faso
| | - Joseph I. Boussim
- Laboratory of Plant Biology and Ecology, University Joseph Ki-Zerbo, 03 BP 7021 Ouagadougou 03, Burkina Faso
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Development of a Regional Lidar-Derived Above-Ground Biomass Model with Bayesian Model Averaging for Use in Ponderosa Pine and Mixed Conifer Forests in Arizona and New Mexico, USA. REMOTE SENSING 2018. [DOI: 10.3390/rs10030442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Allometric Models Based on Bayesian Frameworks Give Better Estimates of Aboveground Biomass in the Miombo Woodlands. FORESTS 2016. [DOI: 10.3390/f7020013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tredennick AT, Karembé M, Dembélé F, Dohn J, Hanan NP. No effects of fire, large herbivores and their interaction on regrowth of harvested trees in two West African savannahs. Afr J Ecol 2015. [DOI: 10.1111/aje.12238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrew T. Tredennick
- Natural Resource Ecology Laboratory and Graduate Degree Program in Ecology Colorado State University Fort Collins CO 80523‐1499 U.S.A
| | - Moussa Karembé
- Faculté des Sciences et Techniques Universite du Bamako Bamako BP E.2528 Mali
| | - Fadiala Dembélé
- Institut Polytechnique Rurale de Formation et de Recherche Appliquée de Katibougou Koulikoro BP 06 Mali
| | - Justin Dohn
- Natural Resource Ecology Laboratory and Graduate Degree Program in Ecology Colorado State University Fort Collins CO 80523‐1499 U.S.A
| | - Niall P. Hanan
- Geospatial Science Center of Excellence South Dakota State University 1021 Medary Ave. Wecota Hall 115, Box 506B Brookings SD 57007 U.S.A
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Issoufou HBA, Rambal S, Le Dantec V, Oï M, Laurent JP, Saadou M, Seghieri J. Is the WBE model appropriate for semi-arid shrubs subjected to clear cutting? TREE PHYSIOLOGY 2015; 35:197-208. [PMID: 25716875 DOI: 10.1093/treephys/tpv002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
It is crucial to understand the adaptive mechanisms of woody plants facing periodic drought to assess their vulnerability to the increasing climate variability predicted in the Sahel. Guiera senegalensis J.F.Gmel is a semi-evergreen Combretaceae commonly found in Sahelian rangelands, fallows and crop fields because of its value as an agroforestry species. We compared canopy leafing, and allometric measurements of leaf area, stem area and stem length and their relationships with leaf water potential, stomatal conductance (gs) and soil-to-leaf hydraulic conductance (KS-L), in mature and current-year resprouts of G. senegalensis in Sahelian Niger. In mature shrubs, seasonal drought reduced the ratio of leaf area to cross-sectional stem area (AL : AS), mainly due to leaf shedding. The canopy of the current-year resprouts remained permanently leafed as the shrubs produced leaves and stems continuously, and their AL : AS ratio increased throughout the dry season. Their KS-L increased, whereas gs decreased. West, Brown and Enquist's (WBE) model can thus describe allometric trends in the seasonal life cycle of undisturbed mature shrubs, but not that of resprouts. Annual clear cutting drives allometric scaling relationships away from theoretical WBE predictions in the current-year resprouts, with scaling exponents 2.5 times greater than those of mature shrubs. High KS-L (twice that of mature shrubs) supports this intensive regeneration process. The adaptive strategy described here is probably common to many woody species that have to cope with both severe seasonal drought and regular disturbance over the long term.
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Affiliation(s)
- Hassane Bil-Assanou Issoufou
- Faculté d'Agronomie et des Sciences de l'Environnement, Université de Maradi, BP 465 Maradi, Niger IRD-UMR HydroSciences Montpellier, Université Montpellier 2, 34095 Montpellier Cedex 5, France
| | - Serge Rambal
- CEFE-CNRS-UMR DREAM, Université de Montpellier 2, 34293 Montpellier Cedex 5, France Departamento de Biologia, Universidade Federal de Lavras, CP 3037, CEP 37200-000, Lavras, MG, Brazil
| | - Valérie Le Dantec
- UPS-UMR CESBIO, 18 Avenue Edouard Belin, 31401 Toulouse Cedex 4, France
| | - Monique Oï
- IRD-UMR HydroSciences Montpellier, Université Montpellier 2, 34095 Montpellier Cedex 5, France
| | - Jean-Paul Laurent
- CNRS-UMR Laboratoire d'étude des Transferts en Hydrologie et Environnement, Bâtiment OSUG-B, Domaine universitaire, BP 53, 38041 Grenoble cedex 09, France
| | - Mahamane Saadou
- Faculté d'Agronomie et des Sciences de l'Environnement, Université de Maradi, BP 465 Maradi, Niger
| | - Josiane Seghieri
- IRD-UMR HydroSciences Montpellier, Université Montpellier 2, 34095 Montpellier Cedex 5, France
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