ARCHITECTURAL ANALYSIS OF PLANT-ROOT SYSTEMS .1. ARCHITECTURAL CORRELATES OF EXPLOITATION EFFICIENCY
ARCHITECTURAL ANALYSIS OF PLANT-ROOT SYSTEMS .1. ARCHITECTURAL CORRELATES OF EXPLOITATION EFFICIENCY
复制标题
DOI：
10.1111/j.1469-8137.1991.tb00018.x
复制
发表时间：
1991-07-01
期刊：
影响因子：
9.4
通讯作者：
WILSON, GW
中科院分区：
文献类型：
--
作者：
FITTER, AH;STICKLAND, TR;WILSON, GW
为了确定根系结构的变化是否可以说是适应性的，有必要能够定义特定结构的成本和收益。描述了根生长的模拟模型，该模型允许根系统的发展在几个重要的建筑特征上发生变化，包括拓扑结构、链路长度和半径以及分支角度。该程序还估算了每个根系的利用效率，即枯竭区占用的土壤体积（允许竞争根系之间的重叠）与构建系统所需的组织体积之比。该模型的输出表明，高开发效率与人字拓扑结构（分支主要在主轴上）和长内部和外部链接有关，尽管所有这些特征都与大组织体积相关，因此建设成本高。因此，我们预测，这种“昂贵的”根系将主要发生在营养贫乏的土壤和具有这种土壤特征的植物上。
In order to determine whether variation in root system architecture can be said to be adaptive, it is necessary to be able to define the costs and benefits of particular architectures. A simulation model of root growth is described that allows the development of root systems varying in several important architectural features, including topology, link lengths and radii, and branching angles. The program also estimates the exploitation efficiency of each root system, as the ratio of the volume of soil occupied by depletion zones (allowing for overlaps between competing roots) and the volume of tissue required to construct the system. Output from the model shows that high exploitation efficiency is associated with a herringbone topology (where branching is predominantly on the main axis) and with long interior and exterior links, although all these characteristics are associated with large tissue volumes and hence high construction cost. We predict, therefore, that such 'expensive' root systems will occur mainly in nutrient-poor soils and on plants characteristic of such soils.