Chin J Plant Ecol ›› 2008, Vol. 32 ›› Issue (4): 858-864.DOI: 10.3773/j.issn.1005-264x.2008.04.014

• Original article • Previous Articles     Next Articles


JIA Qing-Yu1, ZHOU Guang-Sheng1,2,*(), ZHOU Li2, XIE Yan-Bin1   

  1. 1Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110016, China
    2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Received:2007-07-02 Accepted:2008-01-11 Online:2008-07-02 Published:2008-07-30
  • Contact: ZHOU Guang-Sheng


Aims We analyzed nitrogen content of Phragmites australis in relation to leaf area index, biomass, etc., as well as seasonal dynamics in growth parameters and nitrogen content and their relationship to stability of P. australis in Panjin wetland, China.

MethodsWe sampled plots to determine biomass (dry matter) and nitrogen content of different organs of P. australis during the growing season of 2005. Nitrogen content was measured by the methods of Bao (2000).

Important findingsThe nitrogen contents in different organs of P. australis were remarkably different, with leaf > stem > fibre > rhizomes and with aboveground parts > belowground parts. Maximum values of all organs appeared in earlier stages of growth. Plant nitrogen content and leaf nitrogen content closely fit a negative linear relationship with accumulative leaf area index. Stem nitrogen content increased with increasing soil depth, and the fibre nitrogen content had a close negative linear relationship with its biomass. Total plant nitrogen storage by P. australis in Panjin wetland was crescent with its development during the growing season. Nitrogen reserves in aboveground and underground parts (0-30 cm soil depth) were 25.76 and 24.04 g·m-2, respectively.

Key words: Phragmites australis, nitrogen content, nitrogen store, dynamics