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Root distribution characteristics of Juglans regia in monoculture and intercropping

MA Chang-ming1; ZHAI Ming-pu2; LIU Chun-peng1. 1 College of Forestry,Agricultural University of Hebei,Baoding City,071000,P.R.China;2 Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,100083,P.R.China.  
The effects of intercropping on Juglans regia root distribution were studied with sampling device in returning farmland area in Pingshan County of Hebei Province,northern China. The results showed that J. regia roots were presented negative exponential distribution in the vertical direction in monoculture,and the roots were concentrated in 10-60 cm ; in the horizontal direction,89.75% root length density centralized in 0-110 cm. While under intercropping condition,J. regia roots were mainly centralized in 20-70 cm in the vertical direction; and in the horizontal direction,95.15% root length density centralized in 0-10 cm. The roots of intercrops of Scutellaria baicalensis mainly distributed in 0-50 cm in vertical direction,and in horizontal direction,mainly distributed in 100-150 cm. Therefore,S. baicalensis has a certain impact on the distribution of J. regia roots.
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