A field simulated experiment was conducted in a Chinese fir plantation to study the effects of nitrogen deposition on the literfall production. Treatments were designed as N0 (0 kg·hm

-2

·a

-1

)

N1 (60 kg·hm

-2

·a

-1

)

N2 (120 kg·hm

-2

·a

-1

) and N3 (240 kg·hm

-2

·a

-1

). According to three years’ collection

the annual litterfall production for the four treatments was estimated

respectively

at 2 427.50

2 238.10

2 286.66 and 2 599.50 kg·hm

-2

in the year 2005

1 008.83

1 164.10

1 147.30 and 976.47 kg·hm-2 in 2006

1 557.85

1 445.60

1 595.85 and 1 555.85 kg·hm

-2

in 2007

suggesting that litterfall production firstly showed a decline then an increase. Compared with N0

N3 treatment increased the litterfall production significantly in 2005

but showed some inhibitive effects in the following years. N2 treatment promoted litterfall production after the first year

but N1 had no consistent effects.. The various components of litterfall revealed different response to nitrogen deposition

with the annual flux for leaffall responding positively to N2 treatments but negatively to N1 and N3. The treatments decreased the litterfall amount for braches and barks but increased the fractions of fruits and miscellancous materials.