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中国农学通报

中国农学通报 ›› 2019, Vol. 35 ›› Issue (35): 45-51.doi: 10.11924/j.issn.1000-6850.casb18110119

所属专题： 园艺

• 林学 园艺 园林 • 上一篇    下一篇

杨树切口处细根碳氮磷化学计量特征对根剪的响应

刘方春, 马海林, 杜振宇, 马丙尧   

  1. 1山东省林业科学研究院
  • 收稿日期:2018-11-28 修回日期:2018-12-14 接受日期:2018-12-14 出版日期:2019-12-16 发布日期:2019-12-16
  • 通讯作者: 马海林
  • 基金资助:
    国家自然科学基金项目“断根对杨树切口处不同根序细根的形态特征、解剖结构及生理代谢的调控机理研究”(31500513)；山东省林业科 技创新项目“林地土壤微生物资源开发及其在改土培肥中的应用”(LYCX08-2018-40)；山东省林业科技创新项目“林地土壤水肥增容抗旱促生关键技 术研究”(LYCX08-2018-41)。

Response of C, N and P Stoichiometric Characteristics of Root Orders in Poplar Incision to Root Pruning

  • Received:2018-11-28 Revised:2018-12-14 Accepted:2018-12-14 Online:2019-12-16 Published:2019-12-16

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摘要： 探讨根剪对杨树切口处不同序级细根的C、N、P化学计量特征的影响作用。通过大田试验，研究6 倍胸径两侧(6-2)、8 倍胸径两侧(8-2)与10 倍胸径两侧(10-2)等不同根剪处理对欧美杨‘I-107’切口处1~5 级根C、N、P 含量与其化学计量比及材积生长的影响。结果表明：同对照（未根剪）相比，6-2 处理1~5级根的C、N、P含量和C/N、C/P 明显减小，10-2 处理变化较小，而8-2 处理则显著增大。随着根序等级的增加，各处理细根的C含量、C/N与C/P 呈递增趋势，N与P含量呈递减趋势，而N/P在不同序级之间未表现出明显的规律。同时，8-2 处理的材积平均生长率最高，分别比CK、6-2 和10-2 处理显著高出40.31%、60.72%和38.10%。相关分析表明，材积平均生长率与细根的C、N含量及C/N、C/P、N/P存在极显著或显著相关关系。综合分析认为，不同根剪强度对杨树切口处细根化学计量特征的影响效果存在明显差异，其中8-2处理通过增加切口处细根的C、N、P含量与化学计量比促进杨树林木的生长。

关键词: 粘合素, 粘合素, 生物信息学, 奶牛

Abstract: The aim of this study is to explore the effects of root pruning on the stoichiometric characteristics of C, N and P among different branch orders of fine root in the incision of Populus euramericana cv. ‘Neva’. A field experiment was designed and performed, in which root system of five-year-old poplar were manually pruned with a sharp spade at six, eight and ten times of DBH (diameter at breast height) distance along both inter-row sides, to study the effects of different root pruning treatments on C, N, P contents and their stoichiometric ratios of the first five order roots in the incision as well as volume growth of poplar. The results indicated that compared with the CK (un-pruned), the C, N and P contents and C/N, C/P ratios from the first to fifth order roots in 6-2 treatment obviously decreased, the 10-2 treatment changed slightly, whereas the 8-2 treatment significantly increased. Along with the increase of root order, the C content and C/N, C/P ratios presented a trend of increasing, the N and P contents presented a trend of decreasing gradually, while no significant variation rule of N/P was observed among different root orders. At the same time, the average volume growth rate of 8-2 treatment was the largest, showing 40.31%, 60.72% and 38.10% increases in comparison with the treatments of CK, 6-2 and 10-2, respectively. Additionally, the correlation analysis indicated that the average volume growth rate was extremely significantly or significantly correlated with C and N contents and the ratios of C/N, C/P and N/P. As a result, significant differences were observed in the effects of different pruning intensities on stoichiometric characteristics of fine root in the incision of Populus euramericana cv. ‘Neva’, in which root pruning at distance of eight times of the DBH along both inter-row sides significantly promotes the volume growth of Populus euramericana cv. ‘Neva’ via increasing the C, N, P contents and their stoichiometric ratios of different root orders in the incision.