Through filed sampling and laboratory analysis

the composition and fractal features of profile soil micro-aggregates in purple hilly area with different land use types were studied. The results showed as follows: Among woodland

pepper filed

dry land

paddy and citrus orchard

micro-aggregates of 0.25～0.05 mm was dominant

followed by micro-aggregates of 0.05 to 0.01 mm

which appropriated 18.80% to 35.57% of the total samples

the least were ＜0.001 mm

which proportion was between 0.33% and 2.57%. In 0—20 cm soil layer

the annual mean weight soil surface area (MWSSA) sequence was woodland (161.04 cm2/g)＞citrus orchard (134.49 cm2/g)＞pepper land (117.31 cm2/g)＞paddy (100.67 cm2/g)＞dry land (96.94 cm2/g). In this layer

the MWSSA of woodland micro-aggregates was significantly higher than other land use types

which aggregate state and aggregate degree superior than others as its aggregate state showed a 16.55%

20.15%

11.23% and 7.68% higher than pepper filed

upland

paddy and citrus orchard

respectively. In 20—40 cm soil layer

the fractal features D of each land use type is like citrus orchard (2.41)＞woodland (2.40)＞pepper field (2.32)＞paddy (2.31)＞upland (2.12)

the D value of upland is significantly lower than other lands. The fractal features of these five land correlate with the result of factor analysis

though some inconsistent exist. Hence

the fractal features of micro-aggregates in different land use type can be

to some extent

seen as an index to characterize superior or inferior of soil physical properties

fertility level and corrosion resistance.