RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (07): 1032-.doi: 10.11870/cjlyzyyhj201707009

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DISTRIBUTION OF SCIRPUS MARIQUETER ON NANHUI COASTS AFTER RECLAMATION AND THE ASSOCIATED AFFECTING FACTORS

TAO Yandong1,2, YU Kefeng1,2, HE Peimin1,2, SUN Bin1,2, LI Chengwei1,2, ZHAO Meng1,2, FANG Shubo1,2   

  1. (1. College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China;2. Shanghai Research Center of Universities for Water Environment & Ecology Engineering, Shanghai Ocean University, Shanghai 201306, China)
  • Online:2017-07-20
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Abstract: The paper studied Scirpus mariqueter ecosystem at the Nanhui coastal reclamation region from September to October in 2015. We investigated 12 environmental factors including soil organic carbon, total phosphorus, total nitrogen, nitrate, nitrite, ammonia, orthophosphate, pH, moisture content, particle size, salinity, tidal elevation of 101 soil samplings. By principle component analysis and canonical correspondence analysis (CCA), the key factors affecting Scirpus mariqueter spatial distribution were analyzed. The results showed that, a significant positive correlation (P<005) occurred between the vegetation distribution and tidal elevation, and the vegetation communities are mainly distributed in the range of tidal elevation about 25 m-34 m. The community coverage and density positively correlated (P<005) to soil salinity. In conclusion, tidal elevation and salinity are the main environmental factors affecting Scirpus mariqueter distribution. Determining the mechanism to explain response of Scirpus wetlands to reclamation project and the potential thresholds by quantitative simulation is therefore encouraged to support the future reclamation work. This study has critical significance for future coastal wetlands ecological remediation. Key words：coastal reclamation; wetlands ecosystem; Scirpus mariqueter; spatial distribution; gradient analysis

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