落叶松人工林的施肥效应

通过对东北地区3年生，9年生及37年生落叶松人工林进行不同肥料、不同剂量的施肥试验，研究施肥对落叶松生长的影响。结果表明，施肥当年即对落叶松生长产生影响，施肥前落叶松林地养分状况并不能完全满足落叶松生长的需要。肥料种类、剂量对不同林龄的落叶松树高、地径和胸径生长有不同的影响，过磷酸钙30g／株的施肥量能较大地促进3年生落叶松地径的生长，尿素 磷酸二氢钾40g／株的施肥量能较大地促进3年生落叶松树高生长；磷酸氢二铵70g／株的施肥量较大地促进9年生落叶松胸径和树高的生长；350g／株的磷酸氢二铵能较大地促进落叶松胸径生长。

The Effect of Fertilization on the Growth of Larix gmelini

The fertilization experimentation with different fertilizers and doses was conducted by using Larlix gmelini (3-year-old, 9-year-old and 37-year-old) plantations grown in the Northeast of China as experimental materials. The effects of fertilization on the growth of Larlix gmelini were studied. The result shows that fertilization can influence the growth of Larlix gmelini even in the same year, and there is no indication of nutrient saturation for Larlix gmelini growth under the practical soil nutrient contents in these plantations. The effects of different fertilizers and doses on the growth of height, base area and DBH for Larlix gmelini plantations in different ages are different. The growth of base area and tree height of 3-year-old trees can be significantly improved by Ca (H 2PO 4) 2 plus Ca 2SO 4 with the dose of 30g per stem and CO(NH 2) 2 plus KH 2PO 4 with the dose of 40 g per stem, respectively. The growth of DBH and height of 9-year-old and 37-year-old trees can be significantly improved by (NH 4) 2 HPO 4 with the dose of 70 g and 350 g per stem, respectively.