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Ecological Studies at the Woodworth Study Area

Effects of Fire Retardant Chemicals and Fire Suppressant Foam on North Dakota Prairie Vegetation

Table 1

Table 1. Summary of vegetation characteristics measured and significant effects of Silv-Ex and Phos-Chek application. Significant effects may include interactions with sampling month or burning (see results).

                                                                                                                                                                         

               Variable                                    Foam effect¹       Retardant effect¹   

Change in number of species                                      *                          *
    Shoot growth, 
                        S. occidentalis                          **
                        R. arkansana
    Total growth, 
                        S. rigida
                        P. pratensis                                                        ***

    Number of stems,
                        S. occidentalis
                        R. arkansana
                        S. rigida
    Leaves/shoot, 
                        S. occidentalis                                                     *
                        R. arkansana
    Leaf length, 
                        S. occidentalis                          *
                        R. arkansana
                        S. rigida
    Number of sprouts,
                        S. occidentalis
                        R. arkansana
    Number of galls/leaf,
                        S. occidentalis
                        R. arkansana
                        S. rigida
    % chewed leaves,
                        S. occidentalis                          * 
                        R. arkansana                            (*)
                        S. rigida
    Herbaceous biomass,
                        June/July 1993                                                  ***
                        September 1993                                                  ***
                        July 1994
                                                                                                                                                                         
1(*) = P=0.06; * = P< 0.05; ** = P<0.01; *** = P< 0.001.

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