杉木幼林磷肥利用率的研究

STUDIES ON THE PUTILIZATION PERCENT OF YOUNG CHINESE FIR PLANTATION

在肥力中等、其它条件正常的酸性红黄壤上，对２年生杉木幼林进行不同磷肥品种（磷酸氢二铵、过磷酸钙、钙镁磷肥）、不同施肥方式（沟施和穴施）的施肥试验。试验进行７个处理、３次重复的随机区组设计。结果表明：施肥后两年内各处理林木胸径、树高、当年抽高等生长指标差异不显著，但总的生物量及叶生物量差异明显，尤其是沟施磷酸氢二铵能明显增加叶和林木总的生物量；施肥后两年内磷肥的利用率以沟施磷酸氢二铵最高（１２．４５％），其次是沟施过磷酸钙（６．８２％）和钙镁磷肥（５．３９％），穴施磷肥利用率较低（＜４％）。

The P fertilization tests, including seven treatments and three times repetition, were studied in two year old Chines fir plantation. The experimental plots were situated in the Xiayang Forestry Station, Mianxi County, Fujian Province, where the soil is yellow-red acid soil derived from granite. The results revealed that P fertilization had little effects on the growth of young Chinese fir plantation, but could affect the foliage and total biomass of the tree remarkably, especially the application of ammonium phosphate in ditch could increase the foliage and total biomass. The highest P utilization percent of young Chinese fir in the 2 years of fertilization is ammonium phosphate in ditch(12 45%), then calcium superphosphate in ditch (6 82%) and calcium magnesium phosphate in ditch (5 39%), wheres P fertilization in hole with lower P utilization percent (less than 4%).