Stepwise Model Path 
Analysis of Deviance Table
Initial Model:
Pinucemb ~ pradyy + ddeg556 + bio4 + prcp49 + slp + topos + dem_aspv +
dem_flacc10rd + prcp103 + soil_calc + s_grund + I(pradyy^2) +
I(ddeg556^2) + I(bio4^2) + I(prcp49^2) + I(slp^2) + I(topos^2) +
I(dem_aspv^2) + I(dem_flacc10rd^2) + I(prcp103^2) + I(soil_calc^2) +
I(s_grund^2)
Final Model:
Pinucemb ~ ddeg556 + prcp49 + I(ddeg556^2)