《Table 2 Relationships among variables of latitude, forest structural and functional attributes and

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《"Forest biodiversity, relationships to structural and functional attributes, and stability in New England forests"》

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Note:p values from the F-test show that all regression models are statistically significant，given a significance level of 0.01.The values with bold fonts show the highest R2coefficient of determination among the fitted regression curves in a group of the

Along the latitudinal gradient，Species Diversity decreases significantly（P<<0.01）from south to north（i.e.from lower latitudes towards higher latitudes，see Table 2）although there is some evidence of higher than expected diversity in northern Vermont and southern Massachusetts（Fig.3a）.The numbers of species（Species Richness）in latitudinal bands are affected by sampling areas（or numbers of plots）in latitudinal bands.Because of different shapes and areas of different New England states，the sizes of latitudinal bands are different among them.Land-use（percentage of land in forest）also varies but usually there are more sampling plots and sampled areas in latitudinal bands with greater area（Fig.2）.There is a linear relationship between Species Diversity and Species Richness in latitudinal bands（Fig.3b）.