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Effects of ectomycorrhizal colonization and nitrogen fertilization on morphology of root tips in a Larix gmelinii plantation in northeastern China

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Ecological Research

Abstract

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.

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Acknowledgments

The authors thank Xiankui Quan, Changfu Huo, Jinliang Liu, and Sen Song for assistance in the field and laboratory, and Drs. Harbin Li and Dali Guo for their insightful comments that greatly improved an earlier draft of this work. The funding for this research was provided by Natural Science Foundation of China (NSFC Grants 30130160).

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

    Yue Sun, Jia-Cun Gu, Hai-Feng Zhuang & Zheng-Quan Wang

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  1. Yue Sun
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Correspondence to Zheng-Quan Wang.

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Sun, Y., Gu, JC., Zhuang, HF. et al. Effects of ectomycorrhizal colonization and nitrogen fertilization on morphology of root tips in a Larix gmelinii plantation in northeastern China. Ecol Res 25, 295–302 (2010). https://doi.org/10.1007/s11284-009-0654-x

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  • DOI: https://doi.org/10.1007/s11284-009-0654-x

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