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we're running an experiment on the effect of abiotic factors (soil salinity and pH) on plant...

we're running an experiment on the effect of abiotic factors (soil salinity and pH) on plant species diversity. we tested at 2 different sites. we had 3 transects and 6 quadrats set up per site and got species richness. for the abiotic factors, we only got 1 soil sample per transect so 3 per site so we can average them. what statistical analysis can we use for the abiotic factors to see if there is a correlation between species richness and each abiotic factor? please explain..
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Principal component analysis (PCA) can be used to decrease the number of variables in the analyses and generate independent variables based on each abiotic factors. ANOVA can also be performed between the variables.

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