In order to explore the effects of different ecological management measures on soil carbon (C)

nitrogen (N)

phosphorus (P) content and their stoichiometry characteristics

thus to provide scientific evidence for ecological management and vegetation restoration of loess hilly region

by combining the means of field sampling and laboratory analysis

Wangmaogou which was the typical watershed in loess hilly region was taken as an example in this study

and the soil C

N and P contents and their stoichiometry of the 0—100 cm soil layer of 5 kinds of sample plots (sloping farmland

woodland

shrub land

grassland and terrace land) were analyzed. The results showed that: (1) Transformed into woodland

shrub land

grassland and terrace land by ecological management measures

soil C and N contents of sloping farmland respectively increased by 1.27

1.18

1.24

1.14 times and 1.64

1.64

1.76

1.57 times; There were significant positive correlation between soil C and N. The vertical distribution of the soil C and N in the 0—100 cm soil profile of woodland

grassland

shrub land and terrace land were quite consistent

showing the same trend of decreasing with soil depth and both appearing enrichment phenomenon in the 0—20 cm soil layer

while soil P did not change much with soil depth. (2) Soil C∶N mean value of sloping farmland was significantly higher than that of other plots (P＜0.05)

while the surface soil C∶P of sloping farmland was significantly lower than that of other plots (P＜0.05). Soil C∶N did not change much

while soil C∶P and N∶P showed the trend of decreasing with soil depth. (3) The distribution of soil C

N and P stoichiometry was mainly determined by soil C and N. The correlations of soil C∶P

N∶P and ammonium nitrogen contents

soil clay contents

soil sand contents

soil water-stable aggregates were significant（P＜0.05）. Soil C

N

P contents and their stoichiometry were not only affected by ecological management and soil depth

but also were relevant to soil physical and chemical properties

meanwhile soil C∶N

C∶P and N∶P could indicate soil fertility level.