Abstract:

Abstract: The soil infiltration and its influencing factors of three typical Phyllostachys edulis forests (P. edulis and Cunninghamia lanceolata mixed forest, P. edulis pure forest and P. edulis and broad-leaved tree mixed stands) in the North of Fujian Province were studied in comparison with C. lanceolata forest and evergreen broadleaved forest. The results showed that the characteristic of soil infiltration differed significantly with forest type and soil layer. Evergreen broadleaved forests had the strongest soil infiltration capability, followed by bamboo and broad-leaved tree mixed stands, however, the P. edulis pure plantation was the poorest. The infiltration capability declined with the increase of soil depth. A common experienced infiltration model was best simulating the infiltrating processes in these forests in this region, followed by Horton equation, and the Kostiakov equation was the most unsuitable model. Correlation analysis showed that the soil infiltration,capability was greatly affected by soil physical and chemical properties and biological activity. The soil biological activity improved the soil infiltration because the soil biology accelerated the soil nutrient cycling rate in stands, and hence improved soil fertility quality. Combined with the correlation analyses, 11 soil physical and chemical properties and biological activity factors, which extremely significantly or significantly influenced soil infiltration, were selected. The comprehensive parameters of soil infiltration (P) and soil physical and chemical properties and soil biological activity (β) were obtained by the principal component analysis, and the linear regression models of different indexes of soil infiltration and its comprehensive parameters (P) and β had been established.

Key words: Key words: middle subtropics, Phyllostachys edulis forest, soil infiltration, correlation analysis, principal component analysis（PCA）