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植物研究 ›› 2019, Vol. 39 ›› Issue (3): 347-357.doi: 10.7525/j.issn.1673-5102.2019.03.004

• 研究报告 • 上一篇    下一篇

灰杨克隆繁殖、自身养分与土壤养分季节变化及其耦合关系的林缘—林内差异

郑亚琼1, 翟军团1,2, 陈家力3, 韩占江1,2, 焦培培1,2, 李志军1,2   

  1. 1. 新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室, 阿拉尔 843300;
    2. 塔里木大学生命科学学院, 阿拉尔 843300;
    3. 塔里木大学植物科学学院, 阿拉尔 843300
  • 收稿日期:2018-11-26 出版日期:2019-05-05 发布日期:2019-05-11
  • 通讯作者: 李志军 E-mail:lizhijun0202@126.com
  • 作者简介:郑亚琼(1987-),女,硕士,主要从事生态学研究。
  • 基金资助:
    国家自然科学基金项目(31260072);国家重点基础研究发展计划项目(2012CB723204)

Seasonal Variations of Clonal Propagation Characteristics of Populus pruinosa Schrenk,Organ Nutrient and Soil Fertility, and Their Coupling Associations in the Forest and Forest Edges

ZHENG Ya-Qiong1, ZHAI Jun-Tuan1,2, CHEN Jia-Li3, HAN Zhan-Jiang1,2, JIAO Pei-Pei1,2, LI Zhi-Jun1,2   

  1. 1. Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin, Xinjiang Production and Construction Group, Alar 843300;
    2. College of Life Sciences Tarim University, Alar 843300;
    3. College of Plant Sciences Tarim University, Alar 843300
  • Received:2018-11-26 Online:2019-05-05 Published:2019-05-11
  • Supported by:
    This work was supported by The National Natural Science Foundation of China(31260072);National Key Basic Research Development Project(2012CB723204)

摘要: 阐明灰杨(Populus pruinosa Schrenk)克隆特征变化及受外界环境影响,是增强灰杨林生态服务功能的基础。本研究在中国新疆塔里木河上游灰杨河岸林,沿垂直河道方向在林缘(距河道200 m)、林内(距河道400 m)生境设置样方,于2014年4~10月,每隔20天调查两生境不定芽、未出土和出土克隆分株数量,测定横走侧根及土壤养分含量。结果表明:(1)横走侧根全氮、全磷、全钾、有机碳含量的变化趋势与不定芽和未出土分株数在4~6月逐渐增加、7~10月逐渐减少变化趋势基本一致,与土壤有机质、碱解氮、速效磷及速效钾含量在4~6月逐渐升高或保持最高水平,在7~10月逐渐降低的变化趋势同步;横走侧根碳氮比在4~6月初逐渐降低,随后呈现增大又减小的趋势;氮磷比在4~6月逐渐减小,7月显著减小后逐渐增大(林缘)或基本保持不变(林内)。(2)不论是林缘还是林内,不定芽数量受到横走侧根全氮和氮磷比的影响,未出土分株数受到横走侧根全氮、有机碳含量、碳氮比的影响;林缘不定芽数量与土壤有机质、碱解氮及速效钾含量相关紧密,未出土分株数与土壤碱解氮和速效磷显著相关,土壤养分也与横走侧根全氮、碳氮比、氮磷比紧密相关,而在林内受到土壤养分影响的主要是横走侧根全氮和氮磷比。(3)林内的不定芽、未出土及出土克隆分株数量显著低于林缘,土壤养分含量通过影响横走侧根养分含量而影响不定芽、未出土分株、出土分株数量。灰杨是杨属为数不多的国家保护植物,具有重要的生态服务功能,我们的结果对基于克隆繁殖的灰杨林保护策略提供基础数据支持。

关键词: 灰杨, 横走侧根, 不定芽, 克隆分株, 矿质养分

Abstract: Propagation features elucidation is important for improving ecological service of poplar forests in arid regions. We studied the relationship between the occurrence of clonal organs of Populus pruinosa Schrenk and soil nutrient content during the clonal propagation, and their variations affected by the forest edge. The sample plot was set up vertical to channel of Tarim River upper reaches in Xinjiang, China, in the riparian forest(400 m away from the river channel) and forest edge(200 m away from the river channel) separately. The number of adventitious buds, underground ramets and unearthed ramets in two habitats was investigated every 20 days from April to October in 2014, and the nutrient contents of lateral roots and soil were also measured. The results show that:(1)The content of total nitrogen, total phosphorus, total potassium and organic carbon of lateral roots increased gradually from April to June, and decreased gradually from July to October, which is consistent with the trend of number variation of the adventitious buds and underground ramets during this period, and also show a spontaneously trend with gradually increased soil organic matter content, available nitrogen content, available phosphorus content and available potassium content or maintain at a high level from April to June, and decreased gradually thereafter from July to October. Whereas, the C/N ratio of lateral roots decreased gradually from April to June, after a slightly increasing and decreasing again, the N/P ratio also decreased gradually from April to June, but show an increasing trend in the forest edge or remain unchanging in the forest after a significant decrease in July. (2)The number of adventitious buds was affected by total nitrogen and nitrogen-phosphorus ratio of lateral roots, the number of underground ramets was affected by the content of total nitrogen, organic carbon and carbon-nitrogen ratio of lateral roots both in the forest and forest edge. In the forest edge, the number of adventitious buds was close related to the content of soil organic matter, alkali-hydrolyzable nitrogen and available potassium, and there was also a significant correlation between the underground ramets and the content of soil alkali-hydrolyzable nitrogen and available phosphorus, as well as a significant correlation between the soil nutrients and the total nitrogen, C/N ratio and N/P ratio of lateral roots, while, the main factors affected by soil nutrients in the forest were total nitrogen and N/P ratio of lateral roots. (3)The number of adventitious buds, underground ramets and unearthed ramets in the forest was significantly lower than that in the forest edge. Soil nutrient content affected the number of adventitious buds, underground ramets and unearthed ramets by influencing the nutrient content of lateral roots. P.pruinosa is one of the few national protected plants in P.pruinosa forest play an important role on ecological services in local area, our results provide a basic data support for the conservation strategy formulation based on the clonal propagation of P.pruinosa forest.

Key words: Populus pruinosa, horizontal lateral root, adventitious bud, clonal ramets, mineral nutrients

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