杉木幼林施肥效应研究

在由粉砂员岩坡积母质发育而成的硅质黄红壤上，经不同施肥量及配比12个处理、不同施肥时间10个处理5年试验研究表明，杉木幼林施氮肥和钾肥无显著效应，施磷肥效应显著。造林当年及第3年各施钙镁磷肥50g/株，与对照比较，杉木幼林地径、胸径、树高、蓄积分别增加15％、18％、15％、53％，取得生长效应与经济效益的最佳水平。配比施肥效应以造林当年与第3年每株各施尿素30g、钙镁磷肥，100g最佳，但配比施肥效应仍以磷肥效应为主。施肥时间以造林当年与第3年隔年施肥效果最佳。

Study on Fertilization Effect on Young Cunninghamia lanceolata Forest

5 years tests on fertilization effect on young Cunninghamia lanceolata forest on silicateyellow red soil with 12 treatments of different fertilization quantity and ratio, 10 treatments ofdifferent fertilization time resulted that it had no effect with N and K fertilizer. but evidenteffect with P fertilizer. Fertilizing 50g/tree of calcium magnesium phosphate, rhizome diameter,tree height and growing stock of the forest increased by 15%. 18%. 15% and 53% respectivelythan the control. Test on ratio showed that fertilizing 30g urea and 100g calcium magnesiumphosphate per tree in the current year and the third year had the best effect, but dominant byP fertilizer. Fertilizing time was the best in the first year and the third year.