Scientia Agricultura Sinica ›› 2016, Vol. 49 ›› Issue (17): 3380-3390.doi: 10.3864/j.issn.0578-1752.2016.17.012

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Aerated Irrigation on CO2 Emissions from Soils of Tomato Fields

CHEN Hui1,2, HOU Hui-jing1,2, CAI Huan-jie1,2, ZHU Yan1,2, WANG Chao2   

  1. 1Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A＆F University, Yangling 712100, Shaanxi
    2College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling 712100, Shaanxi)
  • Received:2016-03-25 Online:2016-09-01 Published:2016-09-01

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Abstract: 【Objective】Carbon dioxide (CO2) is a significant greenhouse gas that also contributes to the global warming. Lots of studies have reported that aerated irrigation would increase crop production, quality and water use efficiency by changing the aeration of root zone, while few studies have focused on the environmental effects of aerated irrigation, especially the greenhouse gas emissions from soils of greenhouse vegetable fields. Hence, it is of significance to analyze the effects of aerated irrigation on CO2 emissions from soils of greenhouse tomato fields for assessing farmland ecological effects of aerated irrigation. 【Method】Venturi meter (Mazzei 287, America) was used as the aeration equipment to irrigate the experimental plots. The method of static chamber/gas chromatography was used to study the effects of aerated irrigation on CO2 emissions. Two factors (irrigation and aeration) were designed in the experiment to reveal the effects of aerated irrigation on soil CO2 emissions. Four treatments were designed in the experiment: aerated deficit irrigation (AI1), unaerated deficit irrigation (CK1), aerated full irrigation (AI2) and unaerated full irrigation (CK2). 【Result】Throughout the whole growth period of tomato, soil CO2 emissions followed the same pattern in different treatments, and peaks occurred at the blooming and fruit setting stages. Treatments with aeration and full irrigation increased average value of CO2 fluxes and cumulative emissions of soil CO2 throughout the whole growing period compared to relative non-aeration and deficit irrigation, but the difference was not significant (P＞0.05). The average value of CO2 fluxes was 229.31, 193.66, 259.10 and 224.76 mg·m-2·h-1, respectively. The maximum cumulative emission of CO2 was 6 383.43 kg·ha-1 in AI2 treatment, which was 1.12, 1.32 and 1.13 times as that in AI1, CK1 and CK2 treatments, respectively. Soil water filled pore space (WFPS) during the whole growing season showed a decreasing trend in different treatments, soil temperature (T) showed a increasing trend and the difference between treatments was relatively small at the same time, while soil organic carbon (SOC) showed a fluctuant pattern. In addition, aerated irrigation decreased T and WFPS, but increased SOC compared to unaerated irrigation, and the treatment effects was not significant. Full irrigation increased WFPS and SOC indistinctively compared to deficit irrigation, while the effects of full irrigation and deficit irrigation on T was different. A negative correlation between soil CO2 emissions and WFPS was observed, while a positive correlation between soil CO2 emissions and T and SOC was observed, but the difference was not significant (P＞0.05). 【Conclusion】Compared to non-aeration, aeration increased soil CO2 emissions, but the difference was not significant (P＞0.05). This study provided some scientific basis and a useful reference for assessing farmland ecological effects and mitigating greenhouse gas emissions from greenhouse soils of aerated irrigation.

Key words: aerated irrigation, CO2, emission, soil, tomato, soil organic carbon

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