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试验地在海拔500米的云务坪林场,为撩壕整地.规格:高深各为40厘米,用上方表土埋入壕中至水平.外侧为穴状整地,规格为50×50×20厘米.1976年3月整地,1977年2月造林,苗木未经选择.1980年12月10日连续选20株,每年进行树高、胸径的测量,生长情况如表:造林后3—5年内幼林根系扩张很快,撩壕整地加深了松土层,为杉木根系发展提供了
Test ground at 500 meters above sea level cloud forest farm site, for the trenches site preparation. Specifications: 40 cm deep, with the top soil buried in the trench to the level of the outer cave-site preparation, size 50 × 50 × 20 cm. March 1976 Site preparation, afforestation in February 1977, seedlings unselected December 20, 1980 selected 20 consecutive annual tree height and diameter measurements, the growth of the table as follows: Afforestation 3-5 years after young root system Expansion soon, trenches and soil preparation to deepen the loose soil, provided for the development of Chinese fir roots