Effects of different nitrogen fertilization methods on growth and non-structure carbohydrate accumulation of Quercus nuttallii seedlings

NI Ming, GAO Zhenzhou, WU Wen, ZHANG Yuhui, YU Fangyuan

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (4) : 107-113.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (4) : 107-113. DOI: 10.12302/j.issn.1000-2006.202005040

Effects of different nitrogen fertilization methods on growth and non-structure carbohydrate accumulation of Quercus nuttallii seedlings

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Abstract

【Objective】The effects of different fertilization methods and different nitrogen application rates on the growth and non-structure carbohydrate accumulation of Quercus nuttallii container seedlings were investigated in this study. This was done to reveal the fertilizer demand of Q. nuttallii seedlings so that optimal fertilization methods and nitrogen application rates could be determined.【Method】Two fertilization methods of average fertilization and exponential fertilization levels were set with one-year-old Q. nuttallii container seedlings as the experimental objects. Fertilization treatments along four concentration gradients were set for each method. The fertilization interval was 7 days and 15 rounds of fertilizer applications were applied. The seedling height and ground diameter were measured after fertilization. Seedling samples were harvested and dried to measure biomass, soluble sugar and starch contents at the end of the experiment.【Result】Both ave-rage fertilization and exponential fertilization significantly promoted the growth of one-year-old Q. nuttallii container seedlings, and the effect of exponential fertilization was better than that of average fertilization. With the increase in nitrogen application, seedling height, ground diameter, aboveground biomass, underground biomass and total biomass all reached the maximum values of 97.90 cm, 10.33 mm, 12.21 g, 26.74 g, and 38.95 g, respectively, under the treatment of Z900; which was 1.53, 1.15, 1.75, 2.47 and 2.19 times the values of CK, respectively. The application of nitrogen fertilizer assigned more biomass to the stems and leaves. Further, the soluble sugar content of each organ increased significantly in each fertilization group and the effect of exponential fertilization was better, whereas the starch content decreased significantly in the roots.【Conclusion】The exponential fertilization was found to be better than the traditional fertilization. The growth and development of one-year-old Quercus nuttallii container seedlings treated with Z900 were the most impressive, suggesting that this treatment is an ideal fertilization treatment for Quercus nuttallii container seedlings.

Key words

Quercus nuttallii / exponential fertilization / average fertilization / growth character / non-structure carbohydrate / container seedling

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NI Ming , GAO Zhenzhou , WU Wen , et al . Effects of different nitrogen fertilization methods on growth and non-structure carbohydrate accumulation of Quercus nuttallii seedlings[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(4): 107-113 https://doi.org/10.12302/j.issn.1000-2006.202005040

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Abstract
高山林线对环境变化具有高度的敏感性, 但林线形成机制仍然没有明确的结论。为了检验高山林线形成是由碳限制还是生长限制决定, 并探讨林线树种适应高山环境的生理生态机制, 选择山西省吕梁山脉北端芦芽山, 沿3个海拔梯度测定了林线树种白杄(Picea meyeri)各组织非结构性碳水化合物(NSC)及其组分含量。结果表明: 白杄总体及各组织NSC含量均随海拔升高而增加, 林线树木不存在碳限制; 白杄NSC源、汇均随海拔升高而增加, 源-汇比在3个海拔之间没有差异, 表明源-汇平衡关系对海拔的适应性, 林线树木碳源活动没有受到限制; 各组织中可溶性糖与淀粉的比值随海拔升高呈增大趋势, 说明树木生长的环境越寒冷, 树木组织中表现出越明显的保护策略, 也可能暗示林线区域的树木更多地受到生长限制。研究结果在一定程度上支持“生长限制”假说。
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