干旱区研究

Arid Zone Research >

2018 , Vol. 35 >Issue 4: 938 - 944

DOI: https://doi.org/10.13866/j.azr.2018.04.23

Oasis Ecology

Effects of Different Irrigation and Fertilization Conditions on Soil N2O Emission from Oasis Farmland

  • WANG Yong ,
  • ZHAO Cheng-yi
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  • 1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2017-10-03

  Revised date: 2017-12-21

  Online published: 2025-11-18

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Abstract

The effects of soil drying-wetting alternation on nitrous oxide (N2O) emission from oasis farmland were analyzed, which could provide the basis for optimizing irrigation and fertilization and reducing N2O emission of oasis farmland. A laboratory incubation experiment was performed to determine the effect of soil drying-wetting alternation on its N2O emission from oasis farmland in arid area. The 100 g dried soil was placed in a 730 mL mason jar, then the mason jar was placed in a 25 ℃ incubator, and the nitrogen content and soil moisture content were strictly controlled through connecting a syringe with a three-way valve to extract gas from the mason jar. The result are as follows: ① Soil drying-wetting alternation influenced significantly the cumulative N2O emission of oasis farmland soil. Without fertilization, the cumulative N2O emission of dryly-treated soil was 1.28 times of that of wetly-treated soil; ② Compared with non-nitrogen treatment, fertilization promoted significantly the soil N2O emission, the highest N2O emission occurred after nitrogen was applied for 0-4 days, and then the soil N2O emission was reduced obviously; ③ The N2O emission rate of the wetted soil was significantly higher than that of the dried soil after nitrogen was applied. The cumulative N2O emission of wetted soil was 2.07 mg·kg-1, and it was 1.16 times of that of dried soil. Therefore, the soil N2O emission from oasis farmland could be reduced by properly prolonging the time interval of drip irrigation and fertilization.

Key words： oasis farmland; soil drying-wetting alternation; nitrogen application; N2O emission

Cite this article

WANG Yong , ZHAO Cheng-yi . Effects of Different Irrigation and Fertilization Conditions on Soil N2O Emission from Oasis Farmland[J]. Arid Zone Research, 2018 , 35(4) : 938 -944 . DOI: 10.13866/j.azr.2018.04.23

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