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2016 | 64 | 2 |
Tytuł artykułu

Water- and N-induced changes in soil C:N:P stoichiometry and its implications for N limitation of a desert steppe species, Glycyrrhiza uralensis

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Języki publikacji
Changes in precipitation patterns and the deposition of atmospheric nitrogen (N) increase the possibility of altering soil carbon (C):N:phosphorus (P) stoichiometry through their effects on soil C and nutrient dynamics, especially in water- and N-limited ecosystems. We conducted separate 2-year watering and N addition experiments, and examined soil C:N:P stoichiometry, relative growth rate, and leaf N resorption traits of Glycyrrhiza uralensis Fisch in a desert steppe of northwestern China. Our objectives were to determine how soil C:N:P stoichiometry responded to climate change, and its indications for plant growth and N resorption. The results showed that additional water increased N loss and thus decreased N availability, resulting in high N resorption from senescing leaves of G. uralensis. N addition increased N availability, consequently reducing plant N dependence on leaf resorption. High relative growth rates occurred with intermediate N:P and C:N ratios, while high N resorption occurred with a low N:P ratio but a high C:N ratio. Our results indicate that soil C:N:P stoichiometry also could be a good indicator of N limitation for desert steppe species. Altered soil C:N:P stoichiometry affects the N strategy of plants, and will be expected to further influence the structure and function of the desert steppe community in the near future.
Opis fizyczny
  • Institute of Environmental Engineering, Ningxia University, No. 489 Helanshan West Road, Yinchuan 750021, China
  • College of Resources and Environment, Ningxia University, No. 539 Helanshan West Road, Yinchuan 750021, China
  • Institute of Environmental Engineering, Ningxia University, No. 489 Helanshan West Road, Yinchuan 750021, China
  • Institute of Environmental Engineering, Ningxia University, No. 489 Helanshan West Road, Yinchuan 750021, China
  • Department of Ecosystem Science and Management, The Pennsylvania State University, 116 ASI Building, University Park, PA 16802, USA
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