论文部分内容阅读
[目的]探究缓释肥施肥量对槲栎 (Quercus aliena) 容器苗生长、养分积累及非结构性碳水化合物 (NSC) 的响应规律.[方法]以槲栎1年生容器苗为研究对象, 采用完全随机设计, 使用缓释肥 (15％N+9％P2O5+12％K2O+2％MgO+微量养分元素 (TE) ) 设置5个施肥处理0.24、0.95、1.91、3.81和5.71 g/L, 测定生长季末槲栎苗高、地径、生物量、养分及非结构性碳水化合物含量与浓度.[结果]0.95、1.91和3.81 g/L施肥水平下, 苗高、整株生物量、整株氮含量、淀粉含量和可溶性糖含量均高于0.24 g/L的施肥水平;当施肥量增至5.71 g/L时, 整株苗木淀粉含量和可溶性糖含量较施肥量0.95～3.81 g/L (施氮量100～400 mg/株) 时下降, 苗高和生物量则无显著变化.[结论]槲栎容器苗合理的施肥区间为0.95～3.81 g/L, 槲栎1年生容器苗组织矿质元素合理的浓度范围为:根系中N 1.63％～1.93％、P 0.48％～0.52％、K 0.65％～0.79％;茎中N 1.11％～1.43％、P 0.24％～0.25％、K0.28％～0.44％.从提高利用率、节约成本、减少环境污染角度考虑, 推荐槲栎最佳缓释肥施用量为0.95 g/L, 即施氮量100 mg/株;可溶性糖和淀粉含量是筛选槲栎苗木施肥量的重要指标, 可推荐用于槲栎苗木的质量评价.“,”[Objective]Determine the effects of slow-release fertilizer on seedling growth, nutrient accumulation, and non-structural carbohydrate (NSC) of Quercus aliena container seedlings.[Method]Experiments were conducted using five different rates (0.24, 0.95, 1.91, 3.81 and 5.71 g/L) of slow-release fertilizer (15％N+9％P2O5+12％K2O+2％MgO+trace element) per liter media with a completely random design.At the end of the first growing season, the seedling height, diameter, biomass, as well as content and concentration of nutrients and NSC of Q.aliena were determined.[Results]Height, plant biomass, plant nitrogen content, starch content, and soluble sugar content were higher with0.95, 1.91, and 3.81 g of slow-release fertilizer per liter media than those with 0.24 g per liter media.When the rate increased to 5.71 g per liter media, no beneficial effects on height were observed.In contrast, lower plant starch content and soluble sugar content were observed at a rate of 5.71 g per liter media.[Conclusion]The recommended fertilization rate was 0.95-3.81 g per liter media of slow-release fertilizer for Q.aliena container seedlings, which is equivalent to100-400 mg N per seedling.Tissue nutrient concentration was used by foresters to gauge nutritional status as follows:in root, N 1.63％-1.93％;P 0.48％-0.52％;K 0.65％-0.79％;in stem, N 1.11％-1.43％;P 0.24％-0.25％;K0.28％-0.44％.From the fertilizer use efficiency, cost and environment protection perspective, the fertilization rate was determined as 0.95 g slow-release fertilizer per liter media (100 mg N per seedling).Soluble sugar and starch content are important indices to optimize nursery fertilization.