应用生态学报2013，Vol.24Issue(1)：25-31,7.
河西走廊中部两种荒漠植物根系构型特征
Root architecture of two desert plants in central Hexi Corridor of Northwest China
摘要
Abstract
In this study, the root systems of desert plant species Reaumuria soongorica and Nitraria tangutorum in the central Hexi Corridor of Northwest China were excavated by shovel, and the char-acteristics of the plant root architecture were analyzed by using topology and fractal theory. The root topological indices of the two desert plants were small, and the root branching patterns were herring-bone-like. The roots of the two desert plants had obvious fractal characteristics, with the fractal di-mension of R. soongorica and N. tangutorum being (1.18±0.04) and (1. 36±0.06) , respective-ly. The root fractal dimension and fractal abundance were significantly positively correlated with the root average link length. The root average link lengths of the two plants were long, which enlarged the plants' effective nutrition space, and thus, made the plants adapt to the dry and infertile soil environment. The sums of the root cross-sectional areas before and after the root bifurcation of the two desert plants were equal, which verified the principle of Leonardo da Vinci. A total of 17 pa-rameters of root architecture were analyzed by the principal component analysis. The parameters of root topological structure, numbers of root links, stepwise branching ratio, and root diameter could well present the root architecture characteristics of the two desert plants.关键词
荒漠植物/根系构型/拓扑指数/分形维数/分支率/连接长度Key words
desert plant/root architecture/topological index/fractal dimension/branching ratio/link length分类
农业科技引用本文复制引用
单立山,李毅,任伟,苏世平,董秋莲,耿东梅..河西走廊中部两种荒漠植物根系构型特征[J].应用生态学报,2013,24(1):25-31,7.基金项目
国家国际科技合作专项(2012DFR30830)、甘肃省科技支撑计划项目(1204NKCA084)和甘肃农业大学校创新基金项目(GAV-CX1112)资助. （2012DFR30830）
