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Ecological thresholds of Suadea heteroptera under gradients of soil salinity and moisture in Daling River estuarine wetland.

WANG Bai, HAN Jia-bo**, ZHOU Zun-chun, DONG Ying, GUAN Xiao-yan, JIANG Bei   

  1. (Liaoning Ocean and Fisheries Science Research Institute; Liaoning Key Laboratory of Marine Biological Resources and Ecology, Dalian 116023, Liaoning, China)
  • Online:2014-01-10 Published:2014-01-10

Abstract: Based on the significant correlation of biomass with density, height and weight of Suadea heteroptera, the biomass was selected as a biological index for analyzing the distribution pattern of S. heteroptera population under different soil physicochemical conditions. Quadratic nonlinear regression of the biomass of S. heteroptera to soil moisture and salinity was fitted very well, suggesting that the distribution of S. heteroptera population was affected by soil salinity and moisture. The ecological thresholds of soil moister and salinity for S. heteroptera in the Daling River estuary were analyzed by Gaussian Model. The results indicated that the optimum soil salinity for the growth of S. heteroptera was 12.14 g·kg-1, with the ecological threshold of 5.02-19.26 g·kg-1 and the optimum ecological threshold of 8.58-15.70 g·kg-1. The optimum soil moisture was 59.82% with the ecological threshold of 22.02%-97.62% and the optimum ecological threshold of 40.92%-78.72%. These results provided basic references for habitat protection and vegetation restoration of S. heteroptera in the estuarine wetland.

Key words: nitrate, ammonium, isotopic composition.