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Distribution characteristics and seasonal dynamics of N, P and K in wetland plants in upper shoal of Jiuduansha, Shanghai.

LIU Chang-e1; YANG Yong-xing1; YANG Yang2   

  1. 1Key Laboratory of Yangtze River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;2School of Life Science and Technology, Tongji University, Shanghai 200092, China
  • Received:2008-04-09 Revised:1900-01-01 Online:2008-11-10 Published:2008-11-10

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Abstract: From April to December 2005, the main wetland plant species Scirpus mariqueter, Spartina alterniflora, and Phragmites australis in the upper shoal of Jiuduansha at the estuary of Yangzi River were sampled monthly, and their N, P, and K contents were determined. The results showed that the test plant species had different distribution characteristics of N, P, and K. The nutrients contents in different species and in different organs of the same species differed with the rhythm of plant growth. Biomass was the main factor limiting the stocks of the nutrients in different plant species and organs. The N, P, and K stocks decreased in the order of Phragmites australis>Spartina alterniflora>Scirpus mariqueter, and their contents in different plant organs varied with time. In stalk, the K content decreased while the N content increased from April to May; in all kinds of organs, the P content decreased from May to June; and in leaf, the N content was higher than that in other organs from June to October.

Key words: Net primary production (NPP), Soil nitrogen mineralization rate, Plant nitrogen retention