Using forest and vegetable soils as controls, three types of tea garden soils, namely high, middle and low productive tea garden soils, were collected to study N2O emission under laboratorial incubation condition. There were two treatments: (I) control soils without addition of any chemicals. (II) N treatment, adding 200 mg N in form of (NH4)2SO4 per 1 kg soil. The soils were continuously incubated at 25℃ for 14 days. After 0, 1, 3, 7 and 14 days incubation, the air in head space of the incubated bottles were collected, respectively, for measuring N2O concentrations. The interaction of soil moisture and N addition on the N2O emission was also studied. The results showed that in a group with natural soils, the soil of high production tea garden had the highest mean N2O emission rate during 14 days incubation period. It reached to 11.26 mg/(kg·d), significantly higher than other four soils. However, in the other group with N addition, vegetable soil showed the highest N2O emission rate, very significantly higher than those in tea and forest soils. The N2O emission rate in N added soils was higher than that in natural soils. The N2O emission rate was increased with the increase of soil moisture content. There was a significant interaction between soil moisture content and N added. N addition to high moisture content soils could stimulate the N2O emission. The paper also discussed the possible N2O production mechanism based on the change of NH4+ and NO3- concentration during the incubation period.
LIN Yi-dong
,
HAN Wen-yan
. N2O Emission from Soils with Different Stands[J]. Journal of Tea Science, 2009
, 29(6)
: 456
-464
.
DOI: 10.13305/j.cnki.jts.2009.6.09
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