Effects of the supply levels and ratios of nitrogen and phosphorus on seed traits of Chenopodium glaucum

TIAN Da-Shuan1

(1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China 100101)

【Abstract】Aims Global nitrogen (N) deposition not only alters the soil N and phosphorus (P) availability, but also changes their ratio. The levels and ratios of N and P supply and their interaction may simultaneously influence plant seed traits. However, so far there has been no experiment to distinguish these complex impacts on plant seed traits in the field. Methods A pot experiment with a factorial design of three levels and ratios of N and P supply was conducted in the Nei Mongol grassland to explore the effects of levels and ratios of N and P supply and their interaction on seed traits of Chenopodium glaucum. Important findings We found that the relative contributions (15%–24%) of N and P supply levels in affecting the N concentrations, P concentrations and germination rates of seeds were larger than that (3%–7%) of N:P supply ratio, whereas seed size was only significantly influenced by N:P. Simultaneously, the seed N and P concentrations were impacted by the interaction of N and P supply levels and ratio. At the same N:P, the decrease in nutrient supply levels increased the seed N concentration, P concentration and germination rate. The N:P supply ratio only had a significant effect on the seed size and germination rate under low nutrient levels. Overall, these results indicate that different seed traits of C. glaucum show different sensitivities to N or P limitations, leading to adaptive and passive responses under different nutrient limitations. This study presents the first field experiment to distinguish the effects of nutrient supply levels, ratios and their interactions on plant seed traits, which provides a new case study on the influences of global N deposition on future dynamics of plant population and community.

【Keywords】 seed trait; nitrogen supply level; phosphorus supply level; N:P; sand cultured pot experiment; adaptive response;

【DOI】

【Funds】 National Natural Science Foundation of China (31600356) National Basic Research Program of China (2017YFA0604801)

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This Article

ISSN:1005-264X

CN:11-3397/Q

Vol 42, No. 09, Pages 963-970

September 2018

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Article Outline

Abstract

  • 1 Materials and methods
  • 2 Results and analysis
  • 3 Discussion
  • References