摘要
采用全根挖掘法挖取塔克拉玛干沙漠腹地3种典型自然植物-塔克拉玛干柽柳(Tamarix taklamakanensis)、塔干沙拐枣(Calligonum roborovskii)、罗布麻(Apocynum venetum)成年植株根系,运用分形理论分析其构型特征。结果表明:(1)塔克拉玛干沙漠腹地3种植物根系均以水平分布为主,根系浅层化特征显著。(2)塔克拉玛干柽柳、塔干沙拐枣和罗布麻根系分形维数分别为1.31±0.05、1.22±0.06、1.14±0.07,分形维数的显著差异表明了3种植物根系分支状况的差异。(3)3种植物根系分支前后横截面积比分别为0.95,1.04和1.06,表明根系具有显著的自相似性和分形特点。(4)根系直径与根长、生物量之间存在很好的相关关系,基径、根系直径等较易测定的指标可以有效地对根长、生物量等构型指标进行预测估计。
The objective of this study was to identify the architecture of root system in the hinterland of Taklimakan desert base on fractal theory. The whole root systems of three natural species includeing Tamarix taklamakanensis,Calligonum roborovskii and Apocynum venetum were excavated by hands. The results indicated that a significant difference for fractal dimension was found between different species which indicates the otherness of root branching pattern for Tamarix taklamakanensis,Calligonum roborovskii and Apocynum venetum. The ratios of sum of root cross- sectional areas after a bifurcation to the cross- sectional area before bifurcation are 0. 95,1.04 and 1. 06 for Tamarix taklamakanensis,Calligonum roborovskii and Apocynum venetum,respectively,which indicate root branching is self- similar. In this paper,significant correlations between the diameter and root length,biomass were found. The study showed that root diameter which can be measured easily is effective index to estimate the root lengths,biomass and other parameters of root architecture.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第8期145-150,共6页
Journal of Arid Land Resources and Environment
基金
中国科学院知识创新工程重要方向性项目(KZCX3-SW-342-02)资助
