Root Distribution of Intercropping Camellia oleifera with Pyrethrum tatsienense

Soils were sampled in stand of intercropping Camellia oleifera with Pyrethrum tatsienense in 2015 in Longquan, Zhejiang province for determine root length, volume and biomass. Results showed that density and length of P. tatsienense roots had similar horizontal distribution, smaller around water dripping line of crown, and increased with the distance to the line, and topped 30 cm from the line. While vertical distribution of density and length of roots decreased with the depth of soil layer, most of root system distributed at 0-20cm layer. Root length density, biomass and volume of C. oleifera around water dripping line occupied 34.76%, 28.27% and 35.23% of the total ones and decreased with increase of the distance, while that under layer of 20cm took 82.27%, 74.66% and 89.39%. Overlap of horizontal root system in intercropping stand was 0.76 near water dripping line, and 0.69 of vertical direction at layer of >20－40.