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root structure of slope protection plants in a high-grade highway

Journal of Forestry Research 2011年第2期22卷 311-313页

作者： WANG Jing-hong LI Xing-tao LIU Xiao-dong Wang Fei LIU Yu College of Landscape Architecture Northeast Forestry University Harbin150040 Heilongjiang China.

root length and root length density of Lespedeza bicolor,Amorpha fruticosa,and Sea buckthorn were investigated in a country highway-TongSan highway（Tongjiang to Sanya） in Heilongjiang Province,*** root lengths were divided into five root orders according to Pregizter sequence classification *** show that sea buckthorn roots are dominated by coarse roots in the horizontal growth,while *** has a large proportion of fine roots in vertical conical growth and *** is in depth *** length density of *** in all the root sequences is higher than that of sea buckthorn and *** the basis of the root structure,it is inferred that *** roots mainly absorb the surface soil moisture for its normal growth;in contrast,*** has good uptake ability to deep soil *** root structure of sea buckthorn implies that it has a strong drought resistance.

关键词： seasonal frost area slope protection plant root structure

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The root structures of 21 aquatic plants in a macrophyte-dominated lake in China

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Journal of Plant Ecology 2018年第1期11卷 39-46页

作者： Xiaolong Huang Ligong Wang Xin Guan Yuanyuan Gao Chunhua Liu Dan Yu Department of Ecology The National Field Station of the Freshwater Ecosystem of Liangzi LakeCollege of Life SciencesWuhan UniversityWuhan 430072China

Aims Aquatic plants play an important role in freshwater *** works have largely focused on the functional significance of plant above ground parts,with much less attention on the root structures of aquatic *** this study,we divided 21 aquatic plants(including five introduced plants)into multiple plant groups(different life forms,monocot/eudicot and introduced/native)with the goal of addressing two questions:(i)what root structures do aquatic plants exhibit,and(ii)are there differences among these plant groups?Methods Twenty-one aquatic plants belonging to four life forms(free-float-ing,emergent,floating-leaved and submerged)were collected at the near flowering stage from a typical macrophyte-dominated lake in the yangtze River Basin,*** following root topological parameters were quantified:altitude(a),path length(pe),magnitude(M),mean topological length(b),topological index(TI)and normed indices qa and *** Findings The root topological indices TI,qa and qb for the 21 aquatic plants were 0.724±0.013,0.290±0.031 and 0.152±0.024(means±S.E.),respectively,revealing a general pattern of dichotomous branching,except for the aquatic root of Myriophyllum aquati-cum(Vell.)Verdc.,which displays herringbone *** three topological indices were significantly lower for monocots(TI=0.700±0.130,qa=0.191±0.149 and qb=0.086±0.236)than eudicots(TI=0.752±0.206,qa=0.405±0.569 and qb=0.229±0.393),indicating that the roots of monocots are typi-cally more dichotomous-like than those of *** the four life forms,the three topological indices for emergent plants(TI=0.832±0.006,qa=0.616±0.018 and qb=0.381±0.014)were significantly higher than those of the other three life ***,there was no difference between the topological indices of introduced and native aquatic plants,but the introduced species *** and Alternanthera philoxeroides(Mart.)*** both aquatic and edaphic roots as well as unusual functions,which may help

关键词： aquatic plants biological invasion introduced species root structure topological index

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