Effect of Tree Roots on Soil Erosion Control at Seadikes in the Northern Part of the Hang Zhou Bay, China

DOI Web Site 参考文献10件
  • ZHANG Jinchi
    College of Forestry Resource and Environment, Nanjing Forestry University
  • NAKAMURA Hiroyuki
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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  • Effect of Tree Roots on Soil Erosion Co

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Afforestation works on seadikes along the coastal line in China aid soil erosion control and help to maintain the stability of seadikes. Tree species currently used in the afforestation are black locust, cryptomeria, water fir, bamboo, and a few chinese fir. In this connection, various laboratory tests and field researches were conducted to study the effect of roots of the different tree species on soil stability, and to know which type of tree species is the most appropriate for soil erosion control on seadikes.<br>Results of research works show that the tree roots, particularly those with diameter smaller than 1mm, known as “rootlets” increase soil anti-erosivity efficiently. Soil anti-scouribility raises with the increase in rootlet length and weight. The correlation coefficients between soil anti-scouring index and the rootlet length and weight is found to be 0.93 and 0.83, respectively. Soil with more tree roots usually has higher porosity, thereby having higher infiltration capacity. The correlation coefficient between soil non-capillary porosity and steady infiltration rate is 0.86.<br>Among the tree species tested, black locust forest has the smallest function on soil erosion control, and bamboo has the largest function. The main afforestation tree species which functions most in soil erosion control are in the order, bamboo>;cryptomeria>water fir>black locust.

収録刊行物

  • 砂防学会誌

    砂防学会誌 51 (2), 5-12, 1998

    Japan Society of Erosion Control Engineering

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