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| Effect of irrigation pattern on soil N2O emissions and interannual variability in greenhouse vegetable fields |
| Received:October 09, 2017 |
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| KeyWord:flood irrigation;drip irrigation;greenhouse vegetable;N2O;interannual variability |
| Author Name | Affiliation | E-mail | | XIE Hai-kuan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | | | LI Gui-chun | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | XU Chi | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | | | DING Wu-han | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | | | JIANG Yu-qian | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | | | WANG Li-gang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | | | LI Hu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Ministry of Agriculture Key Laboratory of Agricultural Non-point Source Pollution Control, China Joint Research Laboratory for Sustainable Agro-ecosystem Research between Chinese Academy of Agricultural Sciences and University of New Hampshire(CAAS-UNH), Beijing 100081, China | lihu0728@sina.com |
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| Abstract: |
| Greenhouse vegetable(GV) fields are one of the most important sources of N2O emissions, and drip irrigation has attracted increasing attention as an effective strategy for reducing such emissions. In the present study, we performed a two-year experiment in a GV field, which included two cucumber seasons, and used the static opaque chamber method to quantify N2O emissions. We also discussed the influences of different irrigation methods(traditional flood irrigation and drip irrigation) on N2O emissions and its interannual variation, in order to provide data support and theoretical basis for mitigating N2O emissions in GV fields. Our study involved three irrigation treatments, including control(CK), flood irrigation(FP), and drip irrigation(FPD). There was no N fertilizer input for the CK treatment, whereas the organic and synthetic N inputs rates were 500 and 700 kg N·hm-2, respectively, for both the FP and FPD treatments, and multiple synthetic N applications were applied according to the nutrient demands of the crops. The N2O emission peaks of the GV fields were induced by both fertilization and irrigation, and they usually lasted for 7 d after basal fertilizer application but only 3~5 d after topdressing events. Soil temperature, moisture, and air temperature significantly affected N2O emission flux, but the dominant factors were different in 2015 and 2016; N2O emission flux was mainly affected by soil and air temperature in 2015 but was mainly affected by soil moisture and temperature in 2016. There were no significant differences in the soil temperature or moisture of the FP or FPD treatments. Compared to FP, FPD increased crop yield also reduced the total N2O emissions by 29.4%~35.1% on an equivalent N application rate. Compared with FP, FPD reduced N2O emission intensity(N2O emission per unit of economic yield) by 34.5%~37.5%, and the emission factor 47.2%~47.7% in two years. Compared to FP, FPD can significantly reduce N2O emissions while also increasing vegetable yield, and its mitigation efficiency was no significantly interannual variation between 2015 and 2016. Therefore, FPD could be an effective N2O mitigation strategy in GV fields and could provide reference for estimating the effects of N2O emission on a long-term scale. |
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