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| Interactive effects of irrigation and nitrogen on N2O and NO emissions from greenhouse soil |
| Received:October 23, 2020 |
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| KeyWord:interaction of irrigation and nitrogen fertilization;greenhouse soil;N2O emission;NO emission;tomato yield;functional genes |
| Author Name | Affiliation | E-mail | | Lü Jin-dong | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | ZHANG Li-yuan | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | YU Na | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | sausoilyn@syau.edu.cn | | ZOU Hong-tao | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | ZHANG Yu-ling | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | ZHANG Yu-long | College of Land and Environment, Shenyang Agricultural University, Key Laboratory of Arable Land Conservation(Northeast China), Ministry of Agriculture and Rural Affairs, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | |
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| Abstract: |
| To optimize irrigation and nitrogen fertilization, and reduce N2O and NO emissions in greenhouses, a tomato field experiment was conducted over seven consecutive years to observe the synchronous emissions of N2O and NO using the closed, static box method. The effects of the lower limits of irrigation（W1： 25 kPa, W2： 35 kPa, W3： 45 kPa）, and nitrogen application rate（N1： 75 kg·hm-2, N2： 300 kg·hm-2, N3： 525 kg·hm-2）on N2O and NO emissions were studied by using two factors and three levels in a randomized blocks design. The peak periods of N2O and NO emissions occurred after fertilization and irrigation. The N2O emission was higher than that of NO during peak periods, but the duration of the peak of NO emission was longer. Irrigation, nitrogen fertilization, and their interaction had a significant effect on the total cumulative（N2O + NO）emission. The interaction of irrigation and nitrogen resulted in the lowest, total cumulative emission of NO in the W1N1 treatment, and the lowest total cumulative emission of N2O and（N2O+NO）in the W2N1 treatment, which were significantly different from the other treatments. The effect of the irrigation lower limit on the yield of tomatoes was greater than the effect of nitrogen fertilization, which was greater than the interaction of irrigation and nitrogen. Compared with W1N1, W1N2, and W1N3, the tomato yield in the W2N1 treatment increased significantly by 48.92%, 50.69% and 17.82%, respectively. The interaction of irrigation and nitrogen resulted in the lowest yield-scaled N2O and NO in the W2N1 treatment（P<0.01）, which were 40.00%~78.57% and 21.43%~60.71% lower than in other treatments, respectively. According to a redundancy analysis, N2O and NO emission fluxes were significantly positively correlated with ammonium nitrogen content, nitrate nitrogen content, amoA-AOA, and nirK gene abundance. Considering the economic and environmental effects of greenhouse vegetables, when combined with organic fertilizer, a lower irrigation limit of 35 kPa, and a nitrogen application rate of 75 kg·hm-2 were conducive to a reduction in N2O and NO emission, with yield assurance. |
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