摘要
采用“４１６Ａ”最优混合设计安排尾叶桉幼林氮磷钾硼肥的施肥试验，建立了尾叶桉高生长与Ｎ、Ｐ、Ｋ、Ｂ肥施用量的回归模型，对模型进行仿真寻优，得到尾叶桉幼林最佳施肥配比的两套方案：高方案为Ｎ８０Ｐ４０Ｋ４０Ｂ２－５（ｋｇ／ｈｍ ２），当年目标树高生长４－５３ ｍ 。中方案为Ｎ３４－９Ｐ１７－４５ Ｋ１７－４５Ｂ１－１（ｋｇ／ｈｍ ２） 目标树高生长２－４５ｍ 。施Ｎ、Ｐ、Ｋ、Ｂ 肥过多或过少均不利于尾叶桉幼林的生长，三大要素中Ｋ 对尾叶桉幼林高生长影响最大，其次是Ｐ，最后是Ｎ。合理施肥能延长尾叶桉的树高生长速生期。采用监界值法诊断得到尾叶桉幼林叶片养分元素及其比值的临界浓度和最适浓度，这将为桉树的合理施肥。
Experiments involved optimal N,P,K and B ratio of fertilization in young trees of Eucalyptus urophylla were carried out by“416 A”optimum mixed design.A polynonial regression equation was established which expresses the mean tree height as function,and the applied amount of N,P,K and B as variables respectively.Using the regression equation,two optimum fertilizer recipes can be obtained by computer processing.The first fertilizer recipe is N\-\{80\}P\-\{40\}K\-\{40\}B\-\{2 5\}(kg/hm\+2),and the target tree height is 4.53m.The second fertilizer recipe is N\-\{34.9\}P\-\{17.45\}K 17 45 B\-\{1.1\}(kg/hm\+2),and the target tree height is 2.45m. Being fertilizing too much or too small N,P,K and B fertilizers,it will cause the bad growth. The order of N,P,K fertilizers which are needed by young trees of E. urophylla is K>P>N.Fertilizing reasonably can extend the fast growing period of tree height. The nutrition status of young trees of E. urophylla was diagnosed by using diagnosis of critical value.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1999年第6期10-18,共9页
Scientia Silvae Sinicae
关键词
尾叶桉
肥料配方
施肥效应
叶诊断
416-A
Eucalyptus urophylla, Fertilizer recipe, Fertilization effect, Leaf diagnosis, Critical value of concentration
