不同土壤N2O排放的研究

doi:10.13305/j.cnki.jts.2009.6.09

摘要/Abstract

摘要： 以森林和蔬菜土壤作对照,采用实验室培养研究了高产、中产和低产等三种茶园土壤N₂O的排放水平,试验设不加氮（对照）与加氮[200 mg/kg,(NH₄)₂SO₄]二处理,在25℃恒温培养0、1、3、7和14 d时分别取样检测N₂O释放量。另外,选择两种茶园土壤研究了土壤含水量与加氮对N₂O排放影响的交互作用。结果表明,对于不加氮的对照土壤组,高产茶园具有较高的N₂O排放量,14 d内平均日排放量高达11.26 mg/(kg·d)（以纯氮计）,显著高于其它四种土壤;但对于加氮处理组,以菜园土壤的N₂O排放水平最高,极显著高于茶园和林地土壤;所有五种土壤加氮后,N₂O排放量均有明显提高。茶园土壤N₂O排放水平随着土壤含水量的提高而增加,并与施氮存在显著的正交互作用,当土壤含水量较高时施氮具有刺激N₂O排放的作用。文章根据土壤培养期间NH₄⁺和NO₃^-含量的变化就N₂O形成机理进行了讨论。

关键词: 茶园土壤, 氧化亚氮（N₂O）, 施氮, 含水量, 交互作用

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

中图分类号:

林衣东, 韩文炎. 不同土壤N₂O排放的研究[J]. 茶叶科学, 2009, 29(6): 456-464. doi: 10.13305/j.cnki.jts.2009.6.09.

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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不同土壤N₂O排放的研究

N₂O Emission from Soils with Different Stands

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