|Table of Contents|

The stoichiometric characteristics of different plant communities in the Duliujian River estuary

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 03
Page:
617-625
Research Field:
Articles
Publishing date:

Info

Title:
The stoichiometric characteristics of different plant communities in the Duliujian River estuary
Author(s):
YOU Chong MO Xue ZHANG Sen ZHENG Yi & LIU Fude**
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
Keywords:
estuarine wetland plant community stoichiometric characteristics driver
CLC:
Q948.1
PACS:
DOI:
10.19675/j.cnki.1006-687x.201808001
DocumentCode:

Abstract:
To elucidate plant community succession and stoichiometric balance in estuarine and coastal wetlands under nutrient limiting conditions, the carbon (C), nitrogen (N), phosphorus (P), and sulfur (S) stoichiometry and their potential drivers for different plant communities in the Duliujian River estuary were studied. The concentrations of C, N, P, and S in different organs (leaf, stem, and root) of Suaeda salsa (Linn.) Pall, Phragmites australis (Cav.) Trin. ex Steud. and Spartina alterniflora Loisel., and environmental factors of soil C, soil N, soil P, soil S, salinity, and pH in the surface soil (0–10 cm) were determined. The results showed that the content of C in the aerial organs of S. alterniflora and P. australis were significantly higher than that in S. salsa, but the opposite occurred in the root, indicating the different carbon allocation strategies for these plants. N and P were mainly distributed in the aerial photosynthetic organs of plants. The contents of N in the Duliujian River estuary was almost equivalent to that of the vegetation in global and wetland vegetation in China, but the contents of P in the Duliujian River estuary were significantly higher than that of global wetlands or those in vegetation in China. S was mainly distributed in the aerial organs in S. salsa and P. communis, whereas distributed in the roots of S. alterniflora, indicating that S was conducive in the promotion of the mutual flowering and the acceleration of the their invasion. The C/P ratio for S. alterniflora was highest and the C/N ratio for P. communis was the highest, suggesting that S. alterniflora had higher P use efficiency and P. communis had higher N use efficiency. In the leaf, the N/P ratios of P. communis and S. salsa in the Supra tidal zone were 7.32 and 8.90, respectively, but the that of S. alterniflora in the intertidal zone was 14.45. According to the Growth Rate Hypothesis, the growth rate was not an effective means of competition between S. alterniflora and P. australis and S. salsa. However, the higher N use efficiency accelerated the invasion of S. alterniflora. Meanwhile, the correlation analysis indicated that soil P and salinity were important factors affecting the elemental balance in plants and stoichiometry changes in the Duliujian River estuary. We conclude that the Duliujian River estuary is being transformed from N limitation to P limitation. The P element plays an important role in plant growth and succession in this area.

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Last Update: 2019-06-25