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Effects of nitrogen addition on root traits and soil nitrogen in the long-term restored grasslands

Author

Listed:
  • Guanghua Jing

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Zhikun Chen

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Qiangqiang Lu

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Liyan He

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Ning Zhao

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Zhao Zhang

    (Key Laboratory of Soil Resource and Biotech Application, Shaanxi Academy of Sciences; Institute of Botany of Shaanxi Province, Xi'an Botanical Garden of Shaanxi Province, Xi'an, P.R. China)

  • Wei Li

    (State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conversion, Northwest A&F University, Yangling, P.R. China)

Abstract

Fine root traits are plastic and responsive to increased nitrogen (N) deposition. However, with the restoring of the ecosystem after grain for green, little research has been reported about the response of root traits in a long-term restored ecosystem to increased N deposition. Therefore, a successive N addition experiment was conducted in a long-term restored grassland on the Loess Plateau to analyse the effects of different N addition levels (0, 2.5, 5, 10, 20 g N/m2/year) on root morphological traits, soil carbon (C) and N. Our results showed that root morphological traits (except for root diameter) firstly increased and then declined, with the maximum in the N level of 5 g/m2/year. N addition significantly increased soil organic carbon, total nitrogen, ammonium nitrogen (NH4+-N) and nitrate-nitrogen (NO3--N) with the increasing N addition level, especially in the soil surface layer. Specific root length and specific root area had remarkable negative correlations with NO3--N, while root diameter and root length density had positive correlations with soil availability N and soil microbial biomass carbon. This study indicated that plants could have the threshold response to adapt to the N addition and prefer to slowly grow rather than quickly invest and return in order to adapt to the environmental stress.

Suggested Citation

  • Guanghua Jing & Zhikun Chen & Qiangqiang Lu & Liyan He & Ning Zhao & Zhao Zhang & Wei Li, 2021. "Effects of nitrogen addition on root traits and soil nitrogen in the long-term restored grasslands," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 67(9), pages 541-547.
    • Handle: RePEc:caa:jnlpse:v:67:y:2021:i:9:id:142-2021-pse
    DOI: 10.17221/142/2021-PSE
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