Abstract: By measuring 8 functional traits of various species, including leaf dry matter content, specific leaf area, leaf area, leaf width, leaf length, leaf thickness, plant height and cover, we calculated six functional diversity indices, including functional attribute diversity, modified functional attribute diversity, convex hull hypervolume, functional evenness, quadratic entropy, and functional dispersion of forest communities in Qiliyu, Shanxi. The results showed that: (1) Functional richness indices of poplarbirch forest were generally higher, those of Juglans cathayensis forest and Quercus wutaishanica forest were intermediate, and those of coniferous forest were lowest in all forest types, indicating that functional richness was related with succession stages. (2) Functional richness indices were positively correlated with species abundance and the Shannon index significantly. Two functional divergence indices were positively correlated with species evenness and Shannon indices significantly. These results indicated the differences of functional diversity were largely caused by differences in amount and composition of plant species. (3) According to the results of principal component analysis (PCA), functional diversity indices could be divided into three main categories, each of which was corresponding to a single aspect of functional diversity: The first principal component axis could be regarded as functional richness factor, the second one as functional divergence factor, and the third one as functional evenness factor. The results showed that functional diversity indices were correlated with each other and independent from each other.

Key words: water consumption characteristics, yield, spring maize, dry matter transport, plastic film color