How Spartina alterniflora adapts to a new environment created by embankment reclamation through C-N-P stoichiometry in the coastal wetlands of eastern China
Yajun Qiao A , Wen Yang A , Yuxuan Zhao A , Nasreen Jeelani A , Lingqian Xu A , Hui Zhao B , Yanan Zhang C , Shuqing An A B and Xin Leng A B DA School of Life Science and Institute of Wetland Ecology, Nanjing University, 163 Xianlin Road, Nanjing, 210046, Jiangsu, P.R. China.
B Nanjing University Ecology Research Institute of Changshu, Changshu, 215500, P.R. China.
C Jiangsu Yancheng Wetland National Nature Reserve, Yancheng, 224057, P.R. China.
D Corresponding author. Email: lengx@nju.edu.cn
Marine and Freshwater Research 69(5) 823-832 https://doi.org/10.1071/MF17374
Submitted: 30 June 2017 Accepted: 8 January 2018 Published: 9 April 2018
Abstract
Although embankment reclamation is a recurring activity in the coastal wetlands of China, the effect of embankment construction on plant growth has attracted little attention. Leaf carbon, nitrogen and phosphorus stoichiometry (C-N-P stoichiometry) of a plant can be used to reflect plant adaptation to new environments created by reclamation. In the present study we investigated the biomass and leaf C-N-P stoichiometry of Spartina alterniflora Loisel., soil C-N-P stoichiometry and soil moisture, salinity, bulk density and pH in both embankment-reclaimed and natural S. alterniflora salt marshes in eastern China. Plant biomass, leaf P content, soil salinity and soil moisture were significantly lower in the reclaimed compared with natural marsh. The decrease in leaf P content is possibly attributed to changes in soil salinity, soil moisture and soil organic C and N content in the reclaimed marsh. The results of the present study indicate that the decreased aboveground biomass in the reclaimed marsh is likely to be correlated with an increase in the leaf N : P ratio, in accordance with the ‘growth rate hypothesis’. However, previously published threshold values of the N : P ratio as indicators of N or P limitation of plant growth may not be applicable to S. alterniflora at our study site.
Additional keywords: indicator, limiting nutrient, N : P ratio, soil salinity, threshold.
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