Sulfur storage changed by exotic Spartina alterniflora in coastal saltmarshes of China |
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| Authors: | Changfang Zhou Shuqing An Zifa Deng Daqiang Yin Yingbiao Zhi Zhiyi Sun Hui Zhao Luxian Zhou Chao Fang Chen Qian |
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| Institution: | 1. Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, PR China;2. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK;3. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China;1. Key Laboratory of Coastal and Island Development of Ministry of Education, Nanjing University, 163 Xianlin avenue, Nanjing 210023, China;2. American University in Central Asia, Bishkek 720015, Kyrgyzstan;3. Yancheng National Nature Reserve for Wetland Rare Birds, Yancheng 224333,China;1. College of Life Sciences, Shaanxi Normal University, Xi''an 710119, PR China;2. School of Life Science and Institute of Wetland Ecology, Nanjing University, Nanjing 210023, PR China;3. Center for Ecosystem Science and Society (Ecoss), Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA;4. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, PR China;1. Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, 510006, China;2. College of Agronomy, Hunan Agricultural University, Changsha, 410128, China;1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;2. School of Environmental Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou 221116, China;3. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;4. JiangSu Provincial Key Laboratory of Saline Soils, Yancheng Teacher''s University, Yancheng 224002, China |
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| Abstract: | For the purpose of ecological engineering, Spartina alterniflora was introduced to China in 1979 and now covers about 112,000 ha of China's coastal lands. It was hypothesized that S. alterniflora could actively change the habitat environment, thus facilitating its competition over native species. In Yancheng Nature Reserve, sulfur storage of sediments and plant tissues was compared among marshes dominated by the exotic S. alterniflora and adjacent native Suaeda salsa and Phragmites australis and bare mudflat. Results showed that the S. alterniflora marsh contained the highest content of water-soluble, adsorbed, carbonate-occluded and total sulfur in the sediment. The sulfur levels were higher in the center than at the edges of the S. alterniflora marsh. Native marshes showed no significant difference in sediment sulfur levels. With greater biomass and higher tissue sulfur concentrations, plant sulfur storage of S. alterniflora vegetation was also larger than those of the native vegetations. Because higher concentrations of sulfur increase the competitive advantage of S. alterniflora over native halophytes, the results of the research showing that S. alterniflora increased marsh sulfur storage may shed light on the mechanism of expansion of monospecific vegetation in coastal China. |
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