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Bulletin of Botanical Research ›› 2016, Vol. 36 ›› Issue (5): 768-774.doi: 10.7525/j.issn.1673-5102.2016.05.019

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Leaf N and P Stoichiometry of Leymus chinensis in Relation to Soil Properties in Saline-alkali Degraded Grassland

ZHAO Long1, WANG Hua3, LIANG Zheng-Wei2, ZHANG Zhong-Hua1,2, TANG Zhong-Hua1, NIE Si-Ming1, ZHAO Dong-Mei1   

  1. 1. Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin 150040;
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102;
    3. Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin 150040
  • Received:2016-03-08 Online:2016-09-15 Published:2016-09-27
  • Supported by:
    This study was fully supported by the National Natural Science Foundation of China(No.41271522);The Fundamental Research Funds for the Central Universities(No.2572015CA05)

Abstract: N and P stoichiometry of constructive species of a climax community has an important influence on the stability and productivity of community. We chose Leymus chinensis, the constructive species of Songnen grassland community to study the effects of grassland degradation on N and P stoichiometry of L.chinensis under saline-alkali stress. There were lower leaf P content(1.32 g·kg-1), medium leaf N content(18.90 g·kg-1) and slightly higher N/P(15.83) in degraded L.chinensis grassland compared with the L.chinensis grassland in the north of China. Leaf N and N/P were significantly positively correlated with soil total nitrogen and soil alkaline hydrolysis nitrogen. Leaf P was significantly negatively correlated with soil total nitrogen and soil alkaline hydrolysis nitrogen, but other factors were not significantly correlated with N, P and N/P. Both the significant correlations between leaf P content and soil N content and departure from leaf P content and soil P content common displayed that there might be a limitation of P in Songnen Plain at the saline alkali degradation of L.chinensis grassland.

Key words: saline-alkali degraded grassland, Leymus chinensis, stoichiometry, N and P, soil factors

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