Links between root developmental traits and foraging performance
Links between root developmental traits and foraging performance
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DOI：
10.1111/j.1365-3040.2011.02371.x
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发表时间：
2011-10-01
影响因子：
7.3
通讯作者：
Pages, Loic
中科院分区：
文献类型：
--
作者：
Pages, Loic
我们设计了一个简单的动态和随机的建筑模型与六个参数的根系的觅食性能，他们的发展过程。土壤觅食量化的体积包围的根，直到一个给定的吸收距离。许多模拟的架构，通过组合每个参数的四个不同的值。土壤定殖率主要由根系伸长速率和枝间距离决定。不那么直观的是，我们发现根之间的伸长速率的分化增加了这种定殖率。吸收效率-实际定殖体积与具有相同长度和对应于吸收距离的半径的独特圆柱体的体积的比率-随着根系大小而下降。尽管如此，对于给定大小的根系，效率存在很大差异，通常在4到10倍的范围内。因此，“效率增益”被定义为效率相对于尺寸的平均趋势的偏差。伸长速率的根间分化增加了这种增益。母根和侧根之间的层次结构，以及侧根之间的伸长速率的变化，也被证明有助于这种优化。几个参数的组合可以导致类似的效率增益。
We designed a simple dynamic and stochastic architectural model with six parameters to link the foraging performance of root systems to their developmental processes. Soil foraging was quantified by the volume enveloping the roots until a given uptake distance. Many simulated architectures were obtained by combining four different values for each parameter. The rate of soil colonization was mainly defined by individual root elongation rates and interbranch distances. Less intuitively, we showed that differentiation of elongation rates among the roots increased this colonization rate. Uptake efficiency - the ratio of the actual colonized volume to the volume of a unique cylinder with the same length and a radius corresponding to the uptake distance - declined with root system size. Nevertheless, large variations in efficiency existed among root systems for a given size, typically in a 4- to 10-fold range. Therefore, the 'efficiency gain' was defined as the deviation from the average trend in efficiency versus size. Between-root differentiation in elongation rates increased this gain. The level of hierarchy between mother and lateral roots, as well as the variation of elongation rates among lateral roots, was also shown to contribute to this optimization. Several parameter combinations could lead to similar efficiency gains.