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Plant and Soil

, Volume 437, Issue 1–2, pp 341–354 | Cite as

Root trait-mediated belowground competition and community composition of a temperate steppe under nitrogen enrichment

  • Zhi Zheng
  • Wenming Bai
  • Wen-Hao ZhangEmail author
Regular Article
  • 302 Downloads

Abstract

Aims

Shifts of plant community composition with enhanced atmospheric nitrogen (N) deposition in grasslands have occurred globally. Despite extensive studies on the effects of enhanced N deposition on plant species composition of grassland community, few studies have focused on belowground ecological processes and duration of N addition.

Methods

In situ long-term (14-year: 2004–2017) and short-term (4-year: 2014–2017) N-addition experiments in the same sites were conducted in a temperate steppe of northern China. We investigated the effects of N-addition on plant community composition and root traits by comparing results of short-term and long-term N addition.

Results

Nitrogen-evoked changes in plant community composition were primarily dependent on N-addition duration and functional groups. Short-term N addition favored growth of grasses, and depressed growth of forbs, while long-term N addition favored growth of sedges, and concurrently depressed growth of grasses and forbs, ultimately leading to a time-dependent shift of plant community composition from co-dominance by grasses and forbs to dominance by grasses, then to dominance by sedges. Similar to the observed aboveground biomass, short-term N addition led to an increase in the relative belowground biomass (the proportion of belowground biomass of individual plant to community belowground biomass) of the grass Stipa krylovii and a decrease in the relative belowground biomass of the forb Artemisia frigida, respectively. In contrast, long-term N addition enhanced the relative belowground biomass of the sedge Carex korshinskyi, and reduced the relative belowground biomass of the grass S. krylovii and the forb A. frigida. Moreover, traits of absorptive fine roots (first-two orders) in the three species (grass: S. krylovii; forb: A. frigida; sedge: C. korshinskyi) that are representatives of three functional groups differed in their responses to short-term and long-term N addition, thus rendering them differentially competitive for acquisition of belowground resource. The changes in root traits of the three species in responses to N addition of varying duration were associated with their relative aboveground biomass.

Conclusions

Root traits play important roles in mediating the competition for belowground resource and changes in plant community composition of temperate grasslands under N enrichment. Our findings provide novel insights into N-deposition-induced changes in steppe community composition by linking root traits of functional groups and duration of N addition.

Keywords

Nitrogen deposition Community dynamics Functional groups Inner Mongolia steppe 

Notes

Acknowledgments

We thank Weile Chen from Pennsylvania State University Michigan State University, Amandine Erktan from University of Goettingen, and Zeqing Ma from Institute of Geographic Sciences and Natural Resources Research of Chinese Academy of Sciences for thoughtful comments on earlier version of the manuscript. This work was supported by National Natural Science Foundation of China (31830011 and 31470466).

Supplementary material

11104_2019_3989_MOESM1_ESM.docx (1.4 mb)
ESM 1 (DOCX 1480 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Vegetation and Environmental Change, Institute of BotanyThe Chinese Academy of SciencesBeijingChina
  2. 2.Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau BiologyThe Chinese Academy of SciencesXinningChina
  3. 3.Inner Mongolia Research Center for PratacultureChinese Academy of SciencesBeijingChina
  4. 4.College of Resource and EnvironmentUniversity of Chinese Academy of SciencesBeijingChina
  5. 5.Research Network of Global Change Biology, Beijing Institutes of Life ScienceChinese Academy of SciencesBeijingChina

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