福建闽楠人工幼林氮磷钾施肥效应与施肥模式

N, P, K formulas for fertilization with young Phoebe bournei plantations in Fujian Province

采用3因素2次D-饱和最优设计,在福建明溪进行田间试验,分析了氮、磷、钾及其配比对闽楠Phoebe bournei幼树生长的影响。结果表明：氮、磷、钾肥对闽楠的树高和冠幅生长作用大小依次为氮肥〉磷肥〉钾肥,对粗（地径）生长作用大小依次为磷肥〉氮肥〉钾肥,且作用效果均为正效应。采用频率分析法对各效应函数进行寻优,结果认为：当目标树高y1≥120%试验对照（ck）,目标地径y2≥120%试验对照（ck）,目标冠幅y3≥110%试验对照（ck）时,在95%置信区间内,试验地闽楠人工幼林的优化施肥量为氮（N）16.81~21.61 g·株-1、磷（P2O5）5.76~9.64g·株-1、钾（K2O）3.31~6.44 g·株-1,m（氮）∶m（磷）∶m（钾）的最佳比例为3.94∶1.57∶1.00。

In order to improve the fertilization effectiveness of young Phoebe bournei plantations. A field experiment was conducted in Mingxi County of Fujian Province based on a D-saturated optimal design with three factors： N, P, and K. The growth effects for young P. bournei plantations were then examined with a frequency analysis and RCB. Results showed that N, P, and K fertilizer efficiency was positive for growth of tree height and crown width （with N〉P〉K） and for increasing diameter at ground-level （with P〉N〉K）. The frequency analysis showed that compared to ck, the expected tree height was /〉 120%, the expected diameter at ground-level was ≥ 120% and the expected crown width was ≥ 110%. In these experimental plots, optimum fertilization rates （in g-tree-I） for young P. bournei plantations were 16.81-21.61 for N, 5.76- 9.64 for P205, and 3.31-6.44 for K20 with a 95% confidence interval with a frequency analysis method; the best ratio of m （N）：m （P2O5）：m （K2O） was 3.94：1.57：1.00. Then providing the basis for scientific fertilization of P. bournei plantations.