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[摘要]：Many characteristics of plains and annuals scale with body size as described by allometric equations of the form Y = beta M-alpha. where Y is an attribute of the organism, beta is a coefficient that varies with attribute, M is a measure of organism size, and alpha is another constant, the scaling exponent. fit current models, the frequently observed quarter-power scaling exponents are hypothesized to be due to fractal-like Structures. However, not all plants or animals conform to the assumptions Of these models. Therefore, they might be expected to have different scaling relations. We Studied one such plant, Chamaesyce setiloba. it prostrate annual herb thin grows to functionally fill a two-dimensional space. Number of leaves scaled slightly less than isometrically with total aboveground plant mass (alpha approximate to 0.9) and substantially less than isometrically with dry total stein mass (alpha = 0.82), showing reduced allocation to leaf its opposed to stern tissue with increasing plant size. Additionally, scalings of the lengths and radii of parent and daughter branches differed front those predicted for three-dimensional trees and Shrubs. Unlike plants with typical three-dimensional architectures. C. setiloba has distinctive scaling relations associated with its particular prostrate herbaceous growth form. |
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