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首页> 外文期刊>Ecological research >Effects of ectomycorrhizal colonization and nitrogen fertilization on morphology of root tips in a Larix gmelinii plantation in northeastern China
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Effects of ectomycorrhizal colonization and nitrogen fertilization on morphology of root tips in a Larix gmelinii plantation in northeastern China

机译：外生菌根定植和施氮对东北落叶松人工林根尖形态的影响

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摘要

Root morphology is important in understanding root functions in forest ecosystems. However, the effects of ectomycorrhizal colonization and soil nutrient availability on root morphology is not clear. In this study, root morphology in relation to season, soil depth, soil nitrogen (N) availability, and mycorrhizal fungal colonization were investigated in a larch (Larix gmelinii) plantation in northeastern China. The first-order roots (or root tips) of larch were sampled four times in May, July, and September of 2005, and May of 2006 from two depths of upper soil layer (0-10 and 10-20 cm) in the control and the N-fertilized plots. The results showed that ectomycorrhizal (ECM) colonization rates for the first-order roots were reduced by 17% under N fertilization. The peak of root colonization rates occurred in summer and was positively correlated with soil temperature. ECM colonization significantly altered root morphology: root diameter was increased by 19 and 29%, root length shortened by 27 and 25%, and specific root length (SRL) reduced by 16 and 19% for the control and the N-fertilized plots, respectively. N fertilization led to decreased root length, but did not affect root diameter and SRL. In addition, effects of ECM colonization on root morphology varied with season and soil depth. The observed relationships among ECM fungal colonization, soil N availability, and root-tip morphology should improve our understanding of how root tips respond to environmental changes in soil in temperate forest ecosystems.
机译：根形态对于理解森林生态系统中的根功能至关重要。然而，外生菌根定植和土壤养分利用率对根系形态的影响尚不清楚。在这项研究中，在中国东北的落叶松（Larix gmelinii）人工林中研究了与季节，土壤深度，土壤氮（N）有效性和菌根真菌定殖有关的根系形态。分别在2005年5月，7月和9月和2006年5月从对照的上层土壤层的两个深度（0-10和10-20 cm）中采样了落叶松的一阶根（或根尖）。和N施肥的地块。结果表明，氮肥使一阶根的根外生菌（ECM）定植率降低了17％。根定殖率的峰值发生在夏季，并且与土壤温度成正相关。 ECM定植显着改变了根的形态：对照和N施肥区的根直径分别增加了19％和29％，根长度缩短了27％和25％，比根长度（SRL）减少了16％和19％。 。施氮可减少根长，但不影响根径和SRL。另外，ECM定植对根系形态的影响随季节和土壤深度而变化。观察到的ECM真菌定植，土壤氮素有效性和根尖形态之间的关系应使我们更好地理解温带森林生态系统中根尖如何响应土壤环境变化。

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  • 来源
    《Ecological research》 |2010年第2期|p.295-302|共8页
  • 作者

    Yue Sun; rnJia-Cun Gu; rnHai-Feng Zhuang; Zheng-Quan Wang;

  • 作者单位

    Key Laboratory of Forest Tree Genetic Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, Xiangfang, 150040 Harbin, People's Republic of China;

    rnKey Laboratory of Forest Tree Genetic Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, Xiangfang, 150040 Harbin, People's Republic of China;

    rnKey Laboratory of Forest Tree Genetic Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, Xiangfang, 150040 Harbin, People's Republic of China;

    rnKey Laboratory of Forest Tree Genetic Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, Xiangfang, 150040 Harbin, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    ectomycorrhizal fungi; larix gmelinii; maoershan forest research station; nitrogen fertilization; root-tip morphology;

    机译：外生菌根真菌;落叶松帽山林业研究站氮肥根尖形态;

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