北亚热带高山区日本落叶松幼龄林施肥技术的研究

Fertilization of Juvenile Larix kaempferi for Northern Sub-tropical Alpine Area

对“八五”期间设置在湖北大老龄林场的日本落叶松幼龄林进行了施肥试验,研究了不同施肥量、不同N、P配比、不同施肥次数及其交互作用对日本落叶松幼林及其后续生长的影响。结果表明:在本试验条件下,不同施肥量对日本落叶松幼龄林的生长影响不显著;N、P比不同对施肥后3年内的日本落叶松生长量有显著影响,各生长量随N肥施用比例的减少、P肥比例的增加而呈下降趋势,至1998年(12年生),N、P比为1∶0的高、径、材积分别比N、P比为1∶1的提高5.79%、6.58%和19.38%;施肥次数对日本落叶松生长的影响很小,与1次施肥相比,2次施肥既起不到增产效果,又增加了营林成本。施肥量为25 g.株-1、仅施N肥并1次施入的各年生长量均显著高于其它多数组合,其胸径、树高和材积生长量分别比其它处理提高16.7%、9.7%和26.2%,增产效果显著。

The influence of amounts, ratios of N, P fertilizer and times of fertilization and their interactions on juvenile Larix kaempferi growth was studied, based on the experimental fertilization forest of 4×3×2 set up during Eighth Five-year-plan period in Dalaoling Forestry Farm, Hubei Province. The results showed that different amounts of fertilization insignificantly affected the growth of Larix kaempferi. Differences in tree growth among 3 ratios of N, P fertilizer were significant within 3 years after fertilization. Growth decreased with the proportion of N fertilizer increasing and P fertilizer decreasing. By year 1998, the DBH, tree height and volume of B1 （ the ratio of N, P fertilizer, 1 ： 0） was 5.79% ,6.58% and 19.38% respectively higher than that of B3 （ the ratio of N, P fertilixer, 1 ： 1 ）. Times of fertilization affected the growth insignificantly, and the growth of 2 times fertilization was lower than that of one-time fertilization. A1 B1 C1 fertilization combined method, namely 25 g fertilization amount, all N fertilizer and one-time fertilization, plantation of L. kaempferi in northern year-old was 16.7% ,9.7% and 26. sub-tropical alpine area, was recommened for short rotation industrial of which diameter, height and volume at 12- 2% respectively higher than that of other average.