施肥方式对幼龄楸树非结构性碳器官分配和生长季动态的影响
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引用本文:关追追,卢奇锋,陈 动,邱 权,苏 艳,李吉跃,何 茜.施肥方式对幼龄楸树非结构性碳器官分配和生长季动态的影响[J].西北植物学报,2022,42(8):1355~1362
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关追追,卢奇锋,陈 动,邱 权,苏 艳,李吉跃,何 茜* (广东省森林植物种质创新与利用重点实验室华南农业大学林学与风景园林学院广州 510642) 
基金项目:国家重点研发计划(2017YFD0600604,2017YFD060060404)
中文摘要:以6年生楸树无性系‘9 1’为试验材料,采用水肥一体化、穴施和不施肥(对照)3种施肥方法,分析施肥对楸树生长、各器官非结构性碳(NSC)含量及时间动态变化的影响,探究楸树NSC分配对施肥的响应机制,为评估楸树单株和林分碳储量提供理论依据。结果表明:(1)连续施肥4年后,与对照相比,穴施处理的树高和胸径分别提高了4.7%和7.1%,水肥一体化处理则分别提高了7.1%和20.5%,水肥一体化的施肥效果更佳。(2)不同施肥方式并未显著改变楸树各器官中可溶性糖含量,但是水肥一体化施肥明显提高了根中淀粉和总NSC的积累;可溶性糖和总NSC在叶和粗根中分布较多,淀粉则在根中含量较高。(3)不同施肥方式并未显著改变楸树各生长时期可溶性糖含量,但水肥一体化施肥明显提高了生长初期和末期淀粉和总NSC含量。研究发现,在整个生长季中,楸树叶中可溶性糖和总NSC一直被消耗,枝中可溶性糖一部分被消耗用于支持叶片生长,一部分以淀粉的形式进行储存,而根系接受源自叶和枝的NSC后转化为淀粉储存起来帮助树木抵抗低温环境;楸树遵循“碳消耗(初期) 碳消耗(中期) 碳积累(末期)”的NSC分配策略;应用水肥一体化技术可显著提高楸树生物量和生产力,在今后林木施肥试验中值得优先考虑。
中文关键词:楸树  碳分配  时间变化  水肥一体化  生产力
 
Effects of Fertilization Regimes on the Organ Allocation and Growth season Dynamics of Non structural Carbon in the Young Catalpa bungei
Abstract:In this study, the six year Catalpa bungei clone (“9 1”) was fertilized via three fertilization schemes, i.e. the integration of water and fertilizer (WF), hole fertilization (HF) and no fertilization (CK) for analyzing the effect of fertilization on the growth of C. bungei. In addition, this paper also studied the effect of fertilization on the content and temporal dynamics of the non structural carbon (NSC) in tree organs, and explored the response mechanism of NSC allocation to fertilization, providing a theoretical basis for evaluating the carbon pool of C. bungei stand. The results showed that: (1) undergoing four year fertilization, the tree height and diameter at breast height (DBH) of HF increased 4.7% and 7.1%, and those of WF increased 7.1% and 20.5% compared with CK, respectively. (2) Different fertilization regimes did not significantly change the soluble sugar content in each organ, but the WF significantly increased the accumulation of starch and total NSC in roots. The soluble sugar and total NSC contents were more distributed in leaves and coarse roots, and starch content was higher in roots. (3) Different fertilization regimes did not significantly change the soluble sugar content during each growth period, but the WF significantly increased the starch and total NSC content during the initial and final period of growing season. The sugar and total NSC contents in leaves were consistently consumed throughout the growing season. One part of the sugar in branches was consumed to support leaf growth, and another part was stored in the form of starch. The NSCs from leaves and branches captured by roots were converted into starch, then stored to help the tree fight low temperatures. In conclusion, C. bungei followed the NSC allocation strategy of “carbon consumption (initial stage) carbon consumption (middle stage) carbon accumulation (final stage)”. In conclusion, the application of water and fertilizer integration technology could significantly improve the biomass and productivity of C. bungei, which was worthy of priority in forest fertilization in the future.
keywords:Catalpa bungei  carbon distribution  temporal dynamics  integration of water and fertilizer  productivity
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