3.5 Three-way ANOVA analysis
The output of the three-way ANOVA indicated significant effects of the
heat, drought, and the combined heat and drought treatments on eight
characteristic indexes in the four alpine meadow species. Height was
significantly affected by species (P <0.05) and heat
(P <0.01). The LWC and AGB were significantly affected
by the height, species, drought and heat interaction, and drought, heat,
and species interaction (P <0.01). The LWC was
relatively weakly affected by drought (P <0.05). The
effect of six of the seven treatments on BGB was non-significant..
Except for species, Pn was significantly affected by the other single
and compound factors (P <0.01). The effect of compound
factors was more significant than that of single factors on Tr
(P <0.01). Except for height and the drought and height
interaction, Gs was significantly affected by the other single and
compound factors (P <0.01). Ci was significantly
affected by seven factors, with the species, drought and species
interaction, height and species interaction, and drought, height, and
species interaction having extremely significant effects
(P <0.01) (Table 4).