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Plant and Soil

, Volume 327, Issue 1–2, pp 481–491 | Cite as

Nutrient resorption responses to water and nitrogen amendment in semi-arid grassland of Inner Mongolia, China

  • Xiao-Tao Lü
  • Xing-Guo HanEmail author
Regular Article

Abstract

Plant growth and ecosystem processes in semi-arid and arid areas are typically limited by nutrient and water availability. Alleviation of these resource stresses by future increases in reactive nitrogen and precipitation may affect internal plant nutrient cycling. The effect of increased nitrogen and water supply on foliar N and P concentrations, resorption efficiency and proficiency in four dominant species was studied in semi-arid grassland in northern China. Four treatments (Control, N addition, water addition and N plus water additions) were replicated in five 4 × 4 m plots per treatment. We found significant interspecific differences in leaf nutrient and resorption variables. N addition and water addition increased N concentration but had no effect on P concentration in green leaves. Both N addition and water addition reduced plant N resorption proficiency. N addition increased and water addition had no effect on P resorption proficiency. N addition and water addition decreased N resorption efficiency while increasing P resorption efficiency, but responses to N and water addition differed among species. N addition significantly interacted with water addition to affect N resorption efficiency and proficiency but did not affect that of P. These results suggest that species identity, N availability and water availability interact to affect plant nutrient resorption processes. Our analyses provide a better understanding of plant internal nutrient retranslocation in response to potential changes in nitrogen and water availability.

Keywords

N:P ratio Nitrogen addition Nutrient concentration Soil water availability Temperate steppe Typical steppe 

Notes

Acknowledgements

We gratefully acknowledge the Inner Mongolia Grassland Ecological Research Station for help with logistics and access permission to the study site. We thank Deliang Kong and Weijun Wu for field assistance. We are grateful to Sabine Güsewell, Lutz Eckstein and two anonymous reviewers for their valuable comments on earlier versions of the manuscript. Thanks go to Dan Flynn and Matthew Simmons for improving the language of the manuscript. This study was financially supported by the State Key Basic Research and Development Plan of China (2007CB106801) and an Innovative Research Group Project of National Natural Science Foundation of China (NSFC, No. 30521002).

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.State Key Laboratory of Vegetation and Environmental ChangeInstitute of Botany, the Chinese Academy of SciencesBeijingChina
  2. 2.Graduate University of the Chinese Academy of SciencesBeijingChina

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