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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

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文章导航 > Chinese Geographical Science  > 2015 >  25(6): 757-764
LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau[J]. 中国地理科学, 2015, 25(6): 757-764. doi: 10.1007/s11769-014-0723-0
引用本文: LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau[J]. 中国地理科学, 2015, 25(6): 757-764. doi: 10.1007/s11769-014-0723-0
shu
LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. 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. doi: 10.1007/s11769-014-0723-0
Citation: LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. 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. doi: 10.1007/s11769-014-0723-0
shu

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

doi: 10.1007/s11769-014-0723-0
  • 1.

    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, Yangling 712100, China;

  • 2.

    Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;

  • 3.

    University of Chinese Academy of Sciences, Beijing 100049, China

基金项目: Under the auspices of Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues of Chinese Academy of Sciences (No. XDA05060300)
详细信息
    通讯作者:

    LIU Guobin. E-mail: gbliu@ms.iswc.ac.cn

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

  • 1.

    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, Yangling 712100, China;

  • 2.

    Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;

  • 3.

    University of Chinese Academy of Sciences, Beijing 100049, China

Funds: Under the auspices of Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues of Chinese Academy of Sciences (No. XDA05060300)
More Information
    Corresponding author: LIU Guobin. E-mail: gbliu@ms.iswc.ac.cn

  • 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 (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 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.
    Abstract: 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 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.
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  • 收稿日期:  2013-04-29
  • 修回日期:  2013-08-13
  • 刊出日期:  2015-06-27

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

doi: 10.1007/s11769-014-0723-0
  • 1. 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, Yangling 712100, China;
  • 2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;
  • 3. University of Chinese Academy of Sciences, Beijing 100049, China
    • 基金项目:  Under the auspices of Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues of Chinese Academy of Sciences (No. XDA05060300)
    通讯作者: LIU Guobin. E-mail: gbliu@ms.iswc.ac.cn
  • 收稿日期: 2013-04-29
  • 修回日期: 2013-08-13
  • 刊出日期: 2015-06-27

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 (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 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.

English Abstract

LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau[J]. 中国地理科学, 2015, 25(6): 757-764. doi: 10.1007/s11769-014-0723-0
引用本文: LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. Effect of Root Architecture on Structural Stability and Erodibility of Topsoils during Concentrated Flow in Hilly Loess Plateau[J]. 中国地理科学, 2015, 25(6): 757-764. doi: 10.1007/s11769-014-0723-0
shu
LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. 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. doi: 10.1007/s11769-014-0723-0
Citation: LI Qiang, LIU Guobin, ZHANG Zheng, TUO Dengfeng, XU Mingxiang. 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. doi: 10.1007/s11769-014-0723-0
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