刚果12号桉W_5无性系计量施肥及校验研究

Calibration Study of Calculate Fertilization for Eucalyptus ABL12 W 5

在测定土壤平衡解吸磷和土壤钾位缓冲容量的基础上 ,根据林木施肥的立地养分效应模型 ,结合林分的目标产量 ,提出了浅海沉积物砖红壤条件下刚果 12号桉 W5的施肥量 ,并布置了肥效校验田间试验 .田间施肥试验表明 :对浅海沉积物砖红壤条件下刚果12号桉 W5 的后期生长 ,单施氮肥和磷肥对胸径和蓄积量生长都无显著性作用 ,增大钾肥的施用量对蓄积量的生长有明显促进作用 .试验区该无性系 6a达到 180 m3合适的配方量是 :N2 85 kg/hm2 ,P62 kg/hm2 ,K185 kg/hm2 .

Based on the determination of soil balance absorptable phosphorus and soil potassium buffer capacity, and the site nutrition effect model and target biomass, the amount of fertilization was proposed and a field calibration study was conducted about Eucalyptus ABL12 W5 in the laterite formed by shallow seas sediments. The results showed that (1) Applying N and P individually had no significant effects on the growth of diameter at breast height (DBH) and tree stock of Eucalyptus ABL12 W5 in the later growing stage; (2) Increasing the amount of K remarkablely increased the tree stock growth; (3) To reach 180 m 3 within 6 years, the proposed recipe was N 285 kg·hm -2 , P 62 kg·hm -2 and K 185 kg·hm -2 .