The soils nutritious elements (N,P,K,Ca etc) of the second-generation Cunninghamia lanceolata seed orchard and cone yield were investigated. The quadratic polynomials regression equation of cone yield and soil nutrient was established. The correlations among the nutrient elements, the correlations between the nutrient elements and the yield, nutrient profits and losses, the optimum concentration as well as the recommendation fertilizer prescription were also discussed in the present work. The results showed that P, Mg, B, Mo and the interaction of N-B, Mg-B, P-Mg, Mg-Mo were the main factors to impact on yields. The interaction of P-Mg and Mg-Mo might promote the output while N-B and Mg-B reduced. P and Mg, N and B, Mg and B could promote each other, conversely Mg and Mo restrained each other. The optimum concentrations were diluted N at 41. 196～60. 504 mg/kg, valid P at 4. 420 ～ 7. 100 mg/kg, available K at 124. 702 ～ 225. 253 mg/kg, available Ca at 34. 166～75. 827 mg/kg, available Mg at 18. 623～31. 077 mg/kg, valid B at 0. 135～0. 365 mg/kg and valid Mo at 0. 513～0. 847 mg/kg. Therefore soil valid - P, Ca, Mg or Mo were low, and valid- N or B contents were in the middle or higher level. The recommendation of fertilizer prescription for each plant were 49. 082 ～ 129. 289 gP2O5,0～97. 875 gK2O, 8. 881～144. 119 gCaO, 29. 830～ 77.746gMgO, and 0.988～2.538 gMo. The ratio of the P205/Ca0/Mg0/K20/Mo was (0.5～1.3): (0～ l):(0.1～1.5): (0.3～0.8): (0.01～0.03).%为明确闽北杉木二代种子园的土壤N、P、K、Ca、Mg、B、Mo等主要营养元素和母株球果产量的关系,建立了种子园球果产量与土壤养分含量间的二次多项式回归方程,分析探讨种子园土壤养分间的相关性及与产量的关系、养分盈亏状况、适宜浓度范围及建议施肥配方.结果表明:P、Mg、B、Mo以及N-B、Mg-B、P-Mg、Mg-Mo的互作是影响杉木种子园产量的主导因子,P-Mg和Mg-Mo的交互对球果产量有促进效应,而N-B和Mg-B交互对球果产量存在负增产效应.营养元素P与Mg、N与B和Yg与B相互促进,而Mg与Mo之间相互抑制；种子园土壤养分适宜浓度范围即营养诊断标准为水解N 41.196～60.504 mg/kg、有效P 4.420 ～7.100 mg/kg、速效K124.702 ～ 225.253 mg/kg、交换性Ca 34.166 ～ 75.827 mg/kg、交换性Mg 18.623 ～31.077 mg/kg、有效B 0.135 ～0.365mg/kg、有效Mo 0.513 ～0.847 mg/kg；种子国土壤速效P、交换性Ca、交换性Mg以及速效Mo含量总体偏低,处于缺乏或极缺乏状态；速效K、速效N、有效B含量处于中等及以上水平；种子园建议施肥配方为:每株施P2O5 49.082 ～129.289 g、K2O 0 ～97.875 g、CaO 8.881 ～144.119 g、MgO 29.830 ～77.746 g、Mo 0.988 ～2.538 g,配比为P2O5∶CaO:MgO:K2O:Mo=(0.5 ～ 1.3)-(0 ～1):(0.1 ～ 1.5):(0.3 ～0.8):(0.01 ～0.03).
展开▼
