Abstract:

The root distribution is an important factor that affects the irrigation effect. To realize the scientific irrigation of Cerasus yedoensis, this paper investigated root system distribution of C. yedoensis to provide a theoretical basis for reasonable irrigation. In this study, the C. yedoensis was used as study object in Yuyuantan Park. The root drilling method was used to sample the roots in different soil layers of sampling points. Win-RHIZO Pro root analysis system was utilized to analyze root length, d＜1 mm root length, root projected area, root surface area, root average diameter and root dips. The results showed that root of C. yedoensis could stretch out beyond 6 m. For the vertical direction, the soil layer of 0-20 cm was the root concentrated distribution layer for C. yedoensis. The laying of ecological sawdust had a positive promoting effect. Laying different thickness of ecological sawdust had different influences. By covering 5-10 cm thick ecological sawdust, the total root length of C. yedoensis reached (782.98±401.29) cm, which was 10 times of the total root length of C. yedoensis without ecological sawdust and more than 2 times of other experimental groups. The C. yedoensis are shallow root trees. The urban park environment makes the roots of C. yedoensis mainly distribute in the soil surface, and the distribution range could reach twice area of the crown projection. The laying of ecological sawdust causes the roots of C. yedoensis to concentrate on the soil surface, and laying 5-10 cm thick ecological sawdust could effectively promote the growth of C. yedoensis root system in the soil surface, but it has little impact on the C. yedoensis root system below 20 cm.

Key words: Cerasus yedoensis, organic mulch, root distribution characteristics, Yuyuantan Park