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Contrasting root foraging strategies of two subtropical coniferous forests under an increased diversity of understory species

  • Han Yan
  • Liang KouEmail author
  • Huimin Wang
  • Xiaoli Fu
  • Xiaoqin Dai
  • Shenggong Li
Regular Article
  • 139 Downloads

Abstract

Background and aims

Studies on the aboveground growth and traits of plants suggest that plants exhibit faster growth with greater plasticity in leaf traits to adapt to changing environments. However, our knowledge of belowground growth and trait responses and associated root foraging strategies, under competition remains limited.

Methods

Using an understory species-addition experiment, we investigated the responses of function-based root (absorptive fine roots [AFRs] vs. transport fine roots [TFRs]) growth, mycorrhizal association, and order-based root traits (morphological, architectural, and chemical traits) of Pinus massoniana (native species) and Pinus elliottii (exotic species), which are the dominant coniferous tree species in subtropical China.

Results

Higher understory-species diversity increased the biomass of AFRs, but not TFRs and total fine roots (AFRs plus TFRs) of both species. Higher diversity increased the biomass ratio of the AFRs and TFRs of P. elliottii, indicating a tradeoff in plant carbon investment between the two functional root modules for P. elliottii. Higher diversity increased the total root length of P. massoniana, but did not affect that of P. elliottii. Increased species diversity decreased the ectomycorrhizal colonization rate of P. massoniana, but increased that of P. elliottii. Increased species diversity altered the branching-related traits (increased branching ratio and intensity), but did not affect the morphological (diameter, specific root length, and root tissue density) or chemical traits across the root orders of either species.

Conclusions

Our findings indicate that P. elliottii employed dual root foraging strategies (growth and mycorrhizal strategies) and had a cost-benefit tradeoff between AFR and TFR construction. In comparison, P. massoniana only accelerated root growth under competition. These results facilitate a better understanding of the root foraging strategies of plants and the rapid adaptation of exotic species in novel environments.

Keywords

Absorptive fine roots Branching order Competition Environmental plasticity Foraging strategy Root traits 

Notes

Acknowledgements

This research is financially supported by the National Natural Science Foundation of China (No. 31730014; 31670635; 31700379). The authors acknowledge the contributions of the anonymous reviewers.

Supplementary material

11104_2019_3936_MOESM1_ESM.docx (3.3 mb)
ESM 1 (DOCX 3389 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  2. 2.College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijingChina
  3. 3.Jiangxi Provincial Key Laboratory of Ecosystem Processes and InformationTaiheChina

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