The Study On Transplanting Survival Rate Of Ceratoides Arborescens

The transplanting survival rate (TSR) of Ceratoides arborescens was studied through two years field experiment. The influences of natural conditions and trial treatments like transplanting period, soil moisture content, root water soaking, seedlings drying, root diameter, stem diameter etc., to the TSR, were discussed. The relationship between leaf moisture content, chlorophyll content, proline content in stress and recovery process was described. The phenomenon of the root neck drift in sand buried plant was found. The results are as follows:(1) During two periods, end of summer and autumn, the TSR were higher.(2) Soil moisture was the impotent factor to influence the TSR. It got a very low TSR when soil moisture less than 8%. whereas it had a significant higher TSR when soil moisture more than 13%.(3) Root water soaking was benefit to delay water stress, shorten recovery period, and promote the TSR significantly. Along with rain fall, root water soaking might raise the TSR up to more than 90%.(4) The longer seedling drying in the air, the lower the TSR. To drying 24h, the TSR had still more than 60%.(5) Root diameter had a significant effect on the TSR, but not a simple linear correlation. Root diameter 0.200-0.300cm, TSR was high. With larger root diameter, the TSR was lower in summer, highter in autumn.(6) Shortly after transplantation (6d-9d), the leaf water content, chlorophyll content decreased rapidly, the proline content increased dramatically. Then experienced about 2 months of recovery period, the contents returned to their normal state. The changes of leaf water content, chlorophyll content and proline content revealed the physiological regulation of transplanting stress and in recovery process.(7) Found the phenomenon as Root Neck Drift or Root Collar Drift. The phenomenon has not seen reported yet in C. arborescens.(8) Adventitious roots and buds developed in sand buried stems, stem was transformed into the root neck. Along with the increase of the thickness of the sand, the root neck could be gradually upward drift. Observed 4-5 groups new root neck drift up to 7.3cm. Root neck drift promoted the growth of branches.