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Table 3 Quadratic analyses for community parameters regressed with the inundation gradients of the TGR

From: Moderate inundation stimulates plant community assembly in the drawdown zone of China’s Three Gorges Reservoir

Dependent variablesEquationModel summaryParameter estimates
R squareFdf1df2PConstantb1b2
Log10 (biomass)Quadratic0.22427.8812193< 0.0001**2.7830.459− 0.135
HeightQuadratic0.0838.7162193< 0.0001**72.2776.236− 3.965
CoverageQuadratic0.17720.7272193< 0.0001**74.70826.185− 7.965
RichnessQuadratic0.0333.28521930.040*3.6130.713− 0.222
ShannonQuadratic0.0212.03421930.1340.7250.124− 0.041
SimpsonQuadratic0.0131.26121930.2860.3820.055− 0.017
PielouQuadratic0.0100.97021930.3810.4400.052− 0.016
  1. * indicates quadratic regressions that were significant at P < 0.05; ** indicate quadratic regressions that were significant at P < 0.01