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林业科学 ›› 2015, Vol. 51 ›› Issue (4): 148-155.doi: 10.11707/j.1001-7488.20150419

• 研究简报 • 上一篇    下一篇

氮、磷、钾和灌水用量对油茶春梢生长的影响

胡冬南, 涂淑萍, 刘亮英, 张文元, 郭晓敏   

  1. 江西农业大学园林与艺术学院 南昌 330045
  • 收稿日期:2014-04-05 修回日期:2014-05-24 出版日期:2015-04-25 发布日期:2015-05-20
  • 通讯作者: 郭晓敏
  • 基金资助:

    国家自然科学基金项目(31260194);国家科技支撑项目(2012BAD14B14);江西省普通本科高校中青年教师发展计划访问学者专项资金(赣财教字[2012]132号)。

Effects of Nitrogen, Phosphorus, Potassium and Irrigation on the Growth of Spring-shoots in Mature stands of Camellia oleifera

Hu Dongnan, Tu Shuping, Liu Liangying, Zhang Wenyuan, Guo Xiaomin   

  1. College of Landscape Architecture and Art, JAU Nanchang 330045
  • Received:2014-04-05 Revised:2014-05-24 Online:2015-04-25 Published:2015-05-20

摘要:

【目的】油茶产量与春梢的生长状态密切相关,探讨春梢生长与水肥之间的关系可为油茶水肥管理提供科学依据。【方法】在测土配方的基础上针对氮、磷、钾和水4个因子的用量,分别设置5个梯度水平,并采用二次回归通用旋转组合设计试验处理,在江西九江高产无性系油茶成林中开展了水肥试验,通过测定油茶春梢长度、梢直径和叶面积,分析油茶春梢生长的水肥需求规律,筛选出最佳的水肥栽培方案。【结果】在试验用量范围内,适量的氮和水的对油茶春梢伸长生长有明显的促进作用,而磷、钾影响较小。氮、磷、钾、水4个因子对梢直径和叶面积的增加均有显著促进作用,但用量不宜过大。氮与磷、氮与钾、氮与水、磷与水互作对梢长有明显耦合效应; 当氮肥水平较低时,适量增施磷肥促进春梢伸长,增施钾肥影响不明显,当氮肥用量较大时,增施磷肥表现为拮抗效应,适量增施钾肥表现为正向耦合效应; 氮素或水对油茶春梢伸长生长的促进作用均存在阈值,在阈值范围内两者能产生正向协同耦合效应; 水分不足时,磷肥能抵御干旱胁迫的伤害,促进春梢伸长生长,水分充足时,磷肥肥效难以发挥,过量施用造成肥料浪费。一定用量范围内,氮与钾互作对梢直径有明显正向耦合效应,但用量过大则促进效果不明显。【结论】氮、磷、钾、水4个因子均为变量时,以春梢长、梢直径和叶面积接近最大值为目标优化出的水肥方案为: 全年每株油茶增施有效养分N 160 g,P2O5 60 g,K2O 252 g、灌水25 kg。

关键词: 油茶, 氮, 磷, 钾, 水, 耦合, 春梢

Abstract:

【Objective】 Camellia oleifera Abel is a China's endemic species of woody edible oil, its production is closely related to the growth of the spring shoots. Investigation of the relationship between the growth of spring shoots and fertility and water can provide a scientific basis for the management of water and fertilizer of C. oleifera. 【Method】 In order to study the effects of water and fertilizers on the spring-shoots of C. oleifera, five levels of nitrogen, phosphorus, potassium and irrigation were set by using quadratic general rotary unitized design and the length, diameter and leaf area of the spring-shoots were measured in a high yield mature clonal forest of C. oleifera. 【Results】 The result showed that in the range of the tested amounts, the appropriate amounts of nitrogen and irrigation significantly promoted elongation of spring-shoots, but phosphorus and potassium had no obvious effects on the shoot length. Nitrogen, phosphorus, potassium and irrigation were able to significantly improve the shoot diameter and leaf area, but the applied amount should be controlled at a certain range. There were obvious coupling effects of nitrogen and phosphorus, nitrogen and potassium, nitrogen and irrigation, phosphorus and irrigation on the shoot length. At low nitrogen levels, increasing Phosphorus promoted the spring shoot to elongate, but further increase in Potassium over a given amount did not have any obvious effect on the growth. At higher nitrogen levels, increasing Phosphorus exerted an antagonistic effect, but more Potassium showed positive coupling effect. There were thresholds for the amount of Nitrogen or water in terms of promotion of spring shoot elongation, and within the threshold, they were able to produce positive and synergistic coupling effect. In water deficit, Phosphorus fertilizing could withstand the injury of drought stress, and promoted the growth of spring shoots elongation. However, when water was sufficient, the Phosphorus was hard to exert its influence, and its excessive application resulted in waste. Within a certain amount of scope, the interactions of nitrogen and potassium had significant positive coupling effects on the diameter growth of spring shoots, but when their amounts were excessive, the effects were not obvious. 【Conclusion】 When the four factors of nitrogen, phosphorus, potassium and irrigation all were variables, an optimized program of water and fertilizers was made by using the values of shoot length, shoot diameter and leaf area close to the greatest as the goal, that is, effective N 160 g, P2O5 60 g, K2O 252 g and irrigation 25 kg to each plant annually.

Key words: Camellia oleifera, nitrogen, phosphorus, potassium, irrigation, coupling effect, spring-shoot

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