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Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau

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Chinese Geographical Science 2015年第6期25卷 757-764页

作者： LI Qiang LIU Guobin ZHANG Zheng TUO Dengfeng XU Mingxiang State Key Laboratory of Soil Erosion and Dry Land Farming Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources University of Chinese Academy of Sciences Institute of Soil and Water Conservation Northwest A?F University

Traditional vegetation techniques for the control of concentrated flow erosion are widely recognized, whereas only a few studies have experimentally investigated the impacts of belowground roots on the erodibility of topsoils in semi-arid areas. To quantify the effects of root architectures on soil erodibility and its relevant structural properties, simulated flow experiments were conducted at six-week intervals from 18 July to 20 October in 2012 in the hilly Loess Plateau. Five treatments were: 1) bare(control), 2) purple alfalfa(Medicago sativa), representing tap roots(T), 3) switchgrass(Panicum virgatum), representing fibrous roots(F), 4) purple alfalfa and switchgrass, representing both tap and fibrous roots(T + F), and 5) natural recovery(N). For each treatment, soil structural properties and root characteristics were measured at an interval of six weeks. Soil anti-scouribility was calculated. Results showed that grass planting slightly reduced soil bulk density, but increased soil aggregate content by 19.1%, 10.6%, 28.5%, and 41.2% in the treatments T, F, T + F, and N, respectively. Soil shear strength(cohesion and angle of internal friction(φ)) significantly increased after the grass was planted. As roots grew, soil cohesion increased by 115.2%–135.5%, while soil disintegration rate decreased by 39.0%–58.1% in the 21 th week compared with the recorded value in the 9th week. Meanwhile, root density and root surface area density increased by 64.0%–104.7% and 75.9%–157.1%, respectively. No significant differences in soil anti-scouribility were observed between the treatments of T and F or of T + F and N, but the treatments of T + F and N performed more effectively than T or F treatment alone in retarding concentrated flow. Soil aggregation and root surface-area density explained the observed soil anti-scouribility during concentrated flow well for the different treatments. This result proved that the restoration of natural vegetation might be the most appropriat

关键词： fibrous roots tap roots root density soil structural properties soil anti-scouribility hilly Loess Plateau China

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Growth Promotion Effects of Bacillus subtilis on Bletilla striata Seedlings

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World Journal of Traditional Chinese Medicine 2022年第2期8卷 236-240页

作者： Di Liu Jian Chen Hui Yang Zubaida Yousaf Chao-Yang Liu Bi-Sheng Huang College of Pharmacy Hubei University of Chinese MedicineWuhan 430065China Department of Botany Lahore College for Women UniversityLahorePakistan

Objective:The objective of the study is to study the growth promotion effects of Bacillus subtilis inoculants on the growth of Bletilla striata ***:Various concentrations(1/10×,1/50×,1/100×,and 1/500×dilutions)of *** inoculants were applied on the *** *** height,base diameter,leaf length,leaf width,relative chlorophyll content,tuber diameter,average fibrous root length,number of fibrous roots,and fresh weight were measured after incubation for 50 ***:Treatments with different concentrations of *** significantly increased the number of fibrous roots of the *** seedlings and promoted root elongation,and a higher concentration(1/10×dilution)is associated with more significant promotion *** seedlings treated with different concentrations of *** all showed an increase of relative chlorophyll contents in leaves with the increasing inoculant *** *** inoculant at a high concentration(1/10×dilution)significantly promoted the plant height and base diameter of *** *** application of *** did not significantly promote the tuber diameter and fresh weight of *** *** component analysis confirmed the maximum growth promotion by *** inoculant in 1/10×dilution than the other ***:The application of *** can increase the relative chlorophyll content,promote growth and development of roots,and increase plant height and base diameter of *** ***,*** has significant growth promotion effects on *** *** findings provide theoretical basis for the ecological cultivation of ***.

关键词： Chlorophyll content fibrous roots medicinal plant principal component analysis seedling growth promotion

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