我场从1972年1月开始,在场部背后小丘陵山地进行了五种不同整地方式种杉对比试验。经过四年七个月的观察,证明用不同整地方式造林得出不同的效果,可供今后大面积推广速生丰产造林方法参考。五种整地方式的具体做法如下:1.大撩壕:在头年11～12月份炼山挖壕,壕距7尺,宽2尺,深1.5尺,把黄泥心土挖出放在壕的下方,打碎表土,捡净树根、草根、石块,把表土填回壕内,填表土要高出壕面 My field from January 1972 onwards, in the back of the hill behind the field of five different land preparation fir contrast test. After four years and seven months of observation, it shows that afforestation with different land preparation methods leads to different effects and can be used as a reference for large-scale popularization of fast-growing and afforestation methods in the future. Five specific methods of preparation of land preparation are as follows: 1. Big trenches: in the first year from December to December refining trenches, trenches 7 feet wide and 2 feet deep 1.5 feet, the yellow mud heart excavated on the trench Below, smash the topsoil, pick up the net roots, grass roots, stones, fill the topsoil back to the trench, fill the topsoil to be higher than the moat