Allometric scaling relationship between above- and below-ground biomass within and across five woody seedlings.
Allometric scaling relationship between above- and below-ground biomass within and across five woody seedlings.
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五种木本幼苗的地上和地下生物量之间的异速生长比例关系
DOI：
10.1002/ece3.1184
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发表时间：
2014-10
影响因子：
2.6
通讯作者：
Xu, Weifeng
中科院分区：
文献类型：
--
作者：
Cheng, Dongliang;Ma, Yuzhu;Zhong, Quanling;Xu, Weifeng
关键词：
异速生长生物量分配理论预测，叶生物量（ML）与茎（MS）和根（MR）生物量等比例缩放，因此地上生物量（叶和茎）（MA）和根（MR）与地下生物量（根）几乎等比例缩放的树苗在广泛多样性的类群。此外，先前的研究还暗示，标度常数应随物种而变化。然而，凋落物是已知的，这种不变的等距缩放指数是否持有种内生物量分配，以及缩放常数的变化如何影响种间的缩放关系，地上和地下生物量。通过对5种万年青树种幼苗生物量数据的分析，探讨了树种间和种内生物量组分间的比例关系。模型II型回归被用来比较叶，茎，根，地上地下生物量之间的标度指数和常数的数值。结果表明，5种木本植物的ML和MS与MR呈等轴或近等轴关系，MA与MR也呈等轴关系。在生物量标度曲线的Y截距中观察到显著变化，导致ML与MS和ML与MR的种内标度和种间标度关系的分歧，但MS与MR和MA与MR的差异不明显。因此，我们得出结论，MA与MR的近似等距标度关系在每个研究的木本物种内都成立，并且在它们之间不考虑负标度叶与茎的关系
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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影响因子：
2
作者：
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通讯作者：
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