IGSNRR OpenIR
Effect of root architecture on structural stability and erodibility of topsoils during concentrated flow in hilly Loess Plateau
Li Qiang1,3; Liu Guobin1,2; Zhang Zheng2; Tuo Dengfeng2; Xu Mingxiang1,2
2015-12-01
Source PublicationCHINESE GEOGRAPHICAL SCIENCE
ISSN1002-0063
Volume25Issue:6Pages:757-764
AbstractTraditional 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 (phi)) 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 21th 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 appropriate strategy in soil reinforcement in the hilly Loess Plateau.
SubtypeArticle
Keywordfibrous roots tap roots root density soil structural properties soil anti-scouribility hilly Loess Plateau China
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
DOI10.1007/s11769-014-0723-0
WOS KeywordSOIL PROPERTIES ; CHINA ; EROSION ; GRASSLAND ; IMPACT ; REINFORCEMENT ; SUCCESSION ; RAINFALL ; SLOPES ; COVER
Indexed BySCI
Language英语
Funding OrganizationStrategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues of Chinese Academy of Sciences(XDA05060300)
WOS SubjectEnvironmental Sciences
WOS IDWOS:000367015500008
PublisherSPRINGER
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/67842
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiu Guobin
Affiliation1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dry Land Farming, Yangling 712100, Peoples R China
2.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li Qiang,Liu Guobin,Zhang Zheng,et al. Effect of root architecture on structural stability and erodibility of topsoils during concentrated flow in hilly Loess Plateau[J]. CHINESE GEOGRAPHICAL SCIENCE,2015,25(6):757-764.
APA Li Qiang,Liu Guobin,Zhang Zheng,Tuo Dengfeng,&Xu Mingxiang.(2015).Effect of root architecture on structural stability and erodibility of topsoils during concentrated flow in hilly Loess Plateau.CHINESE GEOGRAPHICAL SCIENCE,25(6),757-764.
MLA Li Qiang,et al."Effect of root architecture on structural stability and erodibility of topsoils during concentrated flow in hilly Loess Plateau".CHINESE GEOGRAPHICAL SCIENCE 25.6(2015):757-764.
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