Objective:

2

To study the effect of different nitrogen application rates on the growth and carbon metabolism of

Acanthopanax senticosus

seedlings

and screen out the rational fertilization conditions

in order to provide basis and guidance for scientific fertilization of artificially cultivated

A

.

senticosus

.

Method:

2

A single-point

single-factor field experiment was conducted to study the seedlings of growing evenly

A

.

senticosus

.Five different nitrogen application treatment groups were set up to treat the seedlings

namely N1 group (30 g·m

-2

)

N2 group (60 g·m

-2

)

N3 group (90 g·m

-2

)

N4 group (120 g·m

-2

)

N5 group (150 g·m

-2

) and CK group (0 g·m

-2

)

respectively.Three months later

plant height

root circumference

stem circumference

root-shoot ratio and SPAD were measured at harvest time.The contents of protein

sucrose

starch

soluble sugar and reducing sugar in fresh leaves were measured.

Result:

2

N3 treatment was the best treatment method for the growth and development of

A

.

senticosus

seedlings

and the growth of

A

.

senticosus

seedlings was the best under this treatment.The protein content of

A

.

senticosus

seedlings in N3 treatment was the highest.Starch and sucrose were best accumulated in N5 treatment group and CK treatment group.N5 treatment had the highest soluble sugar content and reducing sugar content.

Conclusion:

2

There is a dose-effect relationship between the growth and development of

A

.

senticosus

seedlings; that is to say

low and high nitrogen application treatments will cause stress on

A

.

senticosus

seedlings.In conclusion

the suitable nitrogen application rate for

A

.

senticosus

growth is 90-120 g·m

-2

.