Allometric scaling relationship between above‐ and below‐ground biomass within and across five woody seedlings |
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Authors: | Dongliang Cheng Yuzhu Ma Quanling Zhong Weifeng Xu |
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Institution: | 1. College of Geographical Science, Fujian Normal University, Fuzhou, Fujian Province, China;2. State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hongkong, China;3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China |
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Abstract: | Allometric biomass allocation theory predicts that leaf biomass (ML) scaled isometrically with stem (MS) and root (MR) biomass, and thus above‐ground biomass (leaf and stem) (MA) and root (MR) scaled nearly isometrically with below‐ground biomass (root) for tree seedlings across a wide diversity of taxa. Furthermore, prior studies also imply that scaling constant should vary with species. However, litter is known about whether such invariant isometric scaling exponents hold for intraspecific biomass allocation, and how variation in scaling constants influences the interspecific scaling relationship between above‐ and below‐ground biomass. Biomass data of seedlings from five evergreen species were examined to test scaling relationships among biomass components across and within species. Model Type II regression was used to compare the numerical values of scaling exponents and constants among leaf, stem, root, and above‐ to below‐ground biomass. The results indicated that ML and MS scaled in an isometric or a nearly isometric manner with MR, as well as MA to MR for five woody species. Significant variation was observed in the Y‐intercepts of the biomass scaling curves, resulting in the divergence for intraspecific scaling and interspecific scaling relationships for ML versus MS and ML versus MR, but not for MS versus MR and MA versus MR. We conclude, therefore, that a nearly isometric scaling relationship of MA versus MR holds true within each of the studied woody species and across them irrespective the negative scaling relationship between leaf and stem. |
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Keywords: | Allometry biomass partitioning patterns intraspecific scaling and interspecific scaling isometric scaling leaf stem and root biomass allocation |
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