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| Interactive effect of irrigation and nitrogen fertilization on greenhouse gas emissions from greenhouse soil |
| Received:March 28, 2018 Revised:July 20, 2018 |
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| KeyWord:interactive effect of irrigation and nitrogen application;greenhouse soil;greenhouse gas emissions;global warming potential |
| Author Name | Affiliation | E-mail | | DU Shi-yu | College of Land and Environment, Shenyang Agricultural University/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | XUE Fei | College of Land and Environment, Shenyang Agricultural University/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | WU Han-qing | College of Land and Environment, Shenyang Agricultural University/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | ZOU Hong-tao | College of Land and Environment, Shenyang Agricultural University/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, 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/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, 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/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, 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/Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | sausoilyn@163.com |
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| Abstract: |
| This study conducted an experiment on greenhouse grown tomatoes to explore the interactive effect of irrigation and nitrogen application on the level of greenhouse gas emissions released from greenhouse soil, and to determine the impact of this effect on emission flux and total cumulative emission of greenhouse gases (N2O, CO2 and CH4). Furthermore, this study examined differences in global warming potential (GWP)and greenhouse gas intensity (GHGI)between the gases over a five-year experimental period. Nine treatments, comprised of a combination of three irrigation lower limits (W1:25 kPa, W2:35 kPa, W3:45 kPa)and three N application rates (N1:75 kg N·hm-2, N2:300 kg N·hm-2, N3:525 kg N·hm-2), were utilized in the experiment. Results showed that the effects of irrigation and fertilization time influenced the emission fluxes of N2O and CO2. N2O emission flux increased after fertilization, and the high irrigation rate (irrigation lower limit 25 kPa)raised the emission fluxes of both N2O and CO2. The variability coefficients of CH4 emission flux were in the middle to strong range. Except for the interactive effect of irrigation and nitrogen on the total cumulative emission of CO2, and the effect of nitrogen fertilization on the total cumulative emission of CH4, irrigation and nitrogen fertilizer rates and their interactions had a very significant effect on tomato yield, GWP, GHGI, and the total cumulative emission of N2O, CO2, and CH4. Additionally, as nitrogen fertilizer rates increased, the total cumulative emission of N2O also increased. The total cumulative emission of N2O and CO2 had a significant, positive correlation with GWP; the average contribution rate of N2O to GWP was 5.25% compared with a GWP of 94.59% for CO2. Ultimately, reducing the nitrogen fertilizer rate and increasing the irrigation lower limit could effectively reduce greenhouse gas emissions and ameliorate global warming. In this study, W2N1 treatment provided the optimal regulation of irrigation and nitrogen fertilization needed to increase tomato yield and mitigate greenhouse gas emissions. |
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