With the increasing chemical fertilizers application and serious soil degradation

the greenhouse gas emissions from agriculture field have be

en also concerned. The experiment combined organic nitrogen and inorganic nitrogen in order to study N

2

O emissions in dry tobacco field. There were 6 treatments:CK0 (no fertilizer)

CK1 (100% inorganic nitrogen)

T1 (50% inorganic nitrogen/50% cake fertilizer nitrogen)

T2 (50% inorganic nitrogen/50% sheep manure nitrogen)

T3 (25% inorganic nitrogen/75% cake fertilizer nitrogen)

T4 (25% inorganic nitrogen/75% sheep manure nitrogen). Totally 45 kg/hm

2

nitrogen was applied for each treatment. With in 142 days from applying basic fertilizer

the N

2

O emission flux

NO

3

-

NH

4

+

0—5 cm soil temperature and moisture content were analyzed. The results showed that:(1) The N

2

O emission flux of the soil reached a high flux after 3~7 days of basic fertilization. The inorganic fertilizer and the combined fertilizer of inorganic and organic for the first high flux were lasting about 20 days and 9 days respectively. The N

2

O emission flux of the soil reached a high flux one more time after 3 days of the second fertilization

and lasted 9 days. During the tobacco growing

soil N

2

O emissions tended to be stable. (2) The cumulative emissions of N

2

O could reach 27.4%~32.6% of the total emissions after one month of basic fertilization. The relationship of the emissions flux and the N

2

O emission factors among treatments was inorganic

>

organic + inorganic (1:1)

>

Organic + Inorganic (3:1). The organic fertilizer reduced the loss of nitrogen in the fertilizer in the form of N

2

O. Compared with the inorganic fertilizers

the yield of T1 and T2 increased by 9.44% and 6.37% respectively; and the N

2

O emission intensity of each treatment were reduced. (3) Principal component analysis results showed that soil temperature and moisture content of 0~5 cm were the dominant factors of N

2

O flux in non-fertilized tobacco fields. Analyzing correlation

temperature and moisture in this

treatment were significantly positively and extremely significantly positively correlated with N

2

O flux

respectively. After fertilization

soil NH

4

+

and soil moisture content were the dominant factors of N

2

O flux from

and the correlation showed a significant positive correlation (P

<

0.01). In summary

the N

2

O flux of tobacco soil was extremely affected by the type of nitrogen fertilizer. After fertilizing

the responses of tobacco field N

2

O fluxes to soil temperature declined

and the main influencing factors were NH

4

+

and soil moisture. Under the same nitrogen content

the combined fertilizer of organic and inorganic rate of 1:1 reduced the N

2

O cumulative emissions significantly

and enhanced the tobacco yield. The cake fertilizer and sheep manure with this organic and inorganic rate reduced the emission intensity by 20.4% and 23.7%

respectively.