杉木春季育苗,种子发芽后,组织幼嫩,生长缓慢,又恰好处于阴雨连绵的霉雨季节,有利菌类繁殖,致使杉木幼苗种腐根腐猝倒严重发生,不但影响生长,有的甚至全部死亡.6、7月干旱季节,幼苗根系尚不发达,吸收能力不强,一遇高温干旱,不但苗木生长停滞,也可导至干枯死亡. Cunninghamia lanceolata seedlings in spring, seed germination, tissue tender, slow growth, but also just in a rainy rainy season, conducive to fungus breeding, resulting in seedlings of Chinese fir root rot rot serious, not only affect the growth, and some even all Died in June and July drought season, seedling root system is still underdeveloped, absorption is not strong, a case of high temperature and drought, not only the growth of seedlings stagnation can also lead to death from dryness.