移植带土球的大苗、大树,历来采用草绳、木板等材料进行包扎,以防在搬运过程中土球松散,保证移植成活。尤其是城市绿化移植大树,更是精细包装,不惜成本。延安市郊根据当地气候土壤条件,采用冻土移植法,经过二十余年的反复试验,先后移植7～10年生野生油松、侧柏大苗数万株,成活率都在85%以上,而且生长良好。具体做法:每年冬初土壤刚刚开始封冻至来年初春土壤解冻前,除北方在数九寒天停止 Transplanting soil ball seedlings, trees, tractors have always been the use of rope, wood and other materials for dressing, to prevent the soil in the process of loosening, to ensure that the transplant alive. In particular, green trees transplanted city, it is fine packaging, at cost. Yan’an suburbs, according to the local climate and soil conditions, the use of frozen soil transplanting method, after more than 20 years of repeated tests, has been transplanted 7 to 10 years wild Pinus tabulaeformis seedlings tens of thousands of strains, the survival rate of more than 85%, and growth good. Specific approach: the beginning of winter each year the soil just started to freeze until early spring before soil thawing, with the exception of the north in the cold days to stop