造林前整地,如挖水平沟、鱼鳞坑、或大坑整地等,应注意回填表土。为什么强调造林前整地要回填表土呢?因为覆盖在地球表面的具有一定肥力的表层土壤,是由坚硬的岩石等成土母质经过几千万年或几万年的风化和生物作用以及经过物理的破碎和化学的 Before afforestation, such as digging ditch, fish scale pit, or pit preparation, etc., should pay attention to backfill topsoil. Why emphasize pre-afforestation to backfill the topsoil it? Because the coverage of the surface of the earth has a certain fertility of the surface soil, from hard rock and other soil parent material after tens of millions or tens of thousands of years of weathering and biological effects and physical Broken and chemical