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Journal of Arid Land  2014, Vol. 6 Issue (5): 601-611    DOI: 10.1007/s40333-014-0004-x
Research Articles     
Vertical root distribution and root cohesion of typical tree species on the Loess Plateau, China
ChaoBo ZHANG1, LiHua CHEN2, Jing JIANG1
1 College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 Key Laboratory of Soil and Water Conservation and Combating Desertification of Ministry of Education of China, School of Water and Soil Conservation,   Beijing Forestry University, Beijing 100083, China
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Abstract  Black locust (Robinia pseudoacacia L.) and Chinese pine (Pinus tabulaeformis Carr.) are two woody plants that are widely planted on the Loess Plateau for controlling soil erosion and land desertification. In this study, we conducted an excavation experiment in 2008 to investigate the overall vertical root distribution characteristics of black locust and Chinese pine. We also performed triaxial compression tests to evaluate the root cohesion (additional soil cohesion increased by roots) of black locust. Two types of root distribution, namely, vertical root (VR) and horizontal root (HR), were used as samples and tested under four soil water content (SWC) conditions (12.7%, 15.0%, 18.0% and 20.0%, respectively). Results showed that the root lengths of the two species were mainly concentrated in the root diameter of 5–20 mm. A comparison of root distribution between the two species indicated that the root length of black locust was significantly greater than that of Chinese pine in nearly all root diameters, although the black locust used in the comparison was 10 years younger than the Chinese pine. Root biomass was also significantly greater in black locust than in Chinese pine, particularly in the root diameters of 3–5 and 5–10 mm. These two species were both found to be deep-rooted. The triaxial compression tests showed that root cohesion was greater in the VR samples than in the HR samples. SWC was negatively related to both soil shear strength and root cohesion. These results could provide useful information on the architectural characteristics of woody root system and expand the knowledge on shallow slope stabilization and soil erosion control by plant roots on the Loess Plateau.

Key wordsaboveground biomass (AGB)      linear regression      vegetation indices      Mu Us Sandy Land     
Received: 13 July 2013      Published: 12 October 2014

The National Natural Science Foundation of China (30872067) and the Youth Foundation of Taiyuan University of Technology (2012L017, 2013T037).

Corresponding Authors: ChaoBo ZHANG     E-mail:
Cite this article:

ChaoBo ZHANG, LiHua CHEN, Jing JIANG. Vertical root distribution and root cohesion of typical tree species on the Loess Plateau, China. Journal of Arid Land, 2014, 6(5): 601-611.

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