干旱区生态环境知识资源中心(Arid): Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau

Arid

	Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau
	Li Qiang; Liu Guobin; Zhang Zheng; Tuo Dengfeng; Xu Mingxiang
来源期刊	Chinese Geographical Science
ISSN	1002-0063
出版年	2015
卷号	25 期号:6 页码:757-764
英文摘要	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 (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.
英文关键词	fibrous roots tap roots root density soil structural properties soil anti-scouribility hilly Loess Plateau China
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5553760
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335564
作者单位	Li Qiang, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, State Key Laboratory of Soil Erosion and Dry Land Farming, Yangling, Shanxi 712100, China.; Liu Guobin, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, State Key Laboratory of Soil Erosion and Dry Land Farming, Yangling, Shanxi 712100, China.; Xu Mingxiang, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, State Key Laboratory of Soil Erosion and Dry Land Farming, Yangling, Shanxi 712100, China.; Zhang Zheng, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shanxi 712100, China.; Tuo Dengfeng, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shanxi 712100, China.
推荐引用方式 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],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.