柚木种源/施肥试验初报

PRELIMINARY REPORT ON PROVENANCE AND FERTILIZATION TRIAL OF TECTONA GRANDIS

对建立在广东省雷州林业局的柚木种源 /施肥试验 2 .5年生林木进行生长量和叶片养分含量分析。结果表明 :3个柚木种源对施肥处理的反应基本一致 ,种源间生长差异不显著。但施肥处理间的差异极显著 ,生长最好的处理为N2 P6K1,即每公顷施N 1 33.3kg、P333.3kg和K 6 6 .7kg ,其树高生长是最差施肥处理的 3.33倍。施肥处理间的树高生长以P素水平间的差异极显著 ,高磷水平的生长优于低磷水平的生长 ,前者是后者的 2 .2 4倍。叶片N、P和K的养分含量随柚木的年生长量变化而变化 ,在年生长量最大的年份 ,叶片养分含量较低 ,反之 。

The paper analyzed the growth and foliage nutrition contents at 1 to 2.5 year old Tectona grandis (teak) plantation for provenance and fertilization trial established at Leizhou Forest Bureau, Guangdong Province. The result showed that the responses to different fertilizer treatments for three provenances are identical. There are no significant difference on the growth among three provenances. However, there are extremely significant differences on the growth among fertilizer treatments. The best fertilizer treatment among twelve fertilizer treatments on the growth is treatment No. 12 (N 2P 6K 1) with applying N 133.3kg, P 333.3 kg and K 66.7 kg per hectare, which of height growth is 3.33 times than that of the worst fertilizer treatment. The differences among fertilizer treatments on the growth mainly are the extremely significant differences among the different P levels. The high growth of high P level is superior to that of low P level, the former is 2.24 times than the later. The foliage nutrient contents of N, P and K vary with the change of annual increment of teak. There are lower foliage nutrient contents on higher increment year, whereas higher foliage nutrient contents on lower increment year.\;