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田升林业局卫林森林经营所1961年以前不分立地条件一律采用50×50厘米的块状整地。实行这种单一的整地方式给更新带来的主要问题是:栽苗抚育后,由于雨水冲击穴面洼陷,致使长期积水,春秋季冻拔害严重;裸露向阳等地,虽不长期积水,但由于土壤湿度大,昼夜温差大,也易发生冻拔害。另外,由于穴内湿度大,土壤温度低,成活率不高,生长缓慢;穴
Tian Sheng Forestry Bureau Wei Lin forest management before 1961 before the conditions of indissoluble use of 50 × 50 cm block preparation. The main problems brought by this single land preparation to the renewal are as follows: after the seedling is nurtured, due to the impact of the rainwater on the cave surface depression, resulting in long-term stagnant water and severe freezing and freezing in spring and autumn; Water, but due to soil moisture, temperature difference between day and night, but also prone to freeze-killed. In addition, due to the cave humidity, soil temperature is low, the survival rate is not high, slow growth; hole