不同土壤N2O排放的研究

doi:10.13305/j.cnki.jts.2009.6.09

Abstract

Abstract: 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.

Key words: tea soil, nitrous oxide(N₂O), N addition, moisture content, interaction

CLC Number:

LIN Yi-dong, HAN Wen-yan. N₂O Emission from Soils with Different Stands[J]. Journal of Tea Science, 2009, 29(6): 456-464.

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N₂O Emission from Soils with Different Stands

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N2O Emission from Soils with Different Stands

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N₂O Emission from Soils with Different Stands