| Effects of rotation and nitrogen reduction on greenhouse gas emissions and soil enzyme activities in oasis irrigation areas |
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| DOI：10.7606/j.issn.1000-7601.2024.04.22 |
| Key Words: rotation nitrogen fertilizer reduction winter cover crop green manure greenhouse gas soil enzyme activity |
| Author Name | Affiliation | | LI Bo | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Cai | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YIN Minxing | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Yan | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | BAI Chunsheng | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CAO Yue | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Lili | State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Based on the field positioning test in Wuwei Oasis Agricultural Experimental Station in 2018, four cropping patterns of spring wheat\|winter rapeseed\|common vetch (WRV), spring wheat\|winter wheat\|common vetch (WWV), spring wheat\|common vetch\|spring wheat\|common vetch (WV) and spring wheat continuous cropping (W) and two nitrogen application levels, nitrogen reduction by 25% (270 kg·hm-2, N1) and traditional nitrogen application (360 kg·hm-2, N2), were established. The results from a total of 8 treatments were measured and analyzed in 2020-2021. The effects of different rotation modes combined with nitrogen reduction on CO2 and N2O emissions from farmland and their relationship with spring wheat yield and soil enzyme activity were analyzed to provide a theoretical basis for the green and efficient development of local agriculture.The results showed that rotation combined with nitrogen reduction treatment significantly reduced greenhouse gas emissions and increased crop yield. The WRVN1 treatment had the best effect on increasing yield and reducing emissions. Compared with WN2 treatment, the total emissions of CO2 and N2O decreased by 15.2% and 28.0%, respectively, Global warming potential (GWP) and greenhouse gas intensity (GHGI) decreased by 15.7% and 30.4%, respectively, and crop yield increased by 16.7%. The activities of soil urease and catalase in 0～10 cm soil layer were higher than those in 10～30 cm soil layer. Rotation reduced the activity of soil enzymes in wheat flowering stage, and the soil enzyme activity of WRVN1 treatment was the lowest. The activities of soil urease and catalase under N1 treatment were 20.1%~28.7% and 8.3%~12.2% lower than those under N2 treatment, respectively, and the emission rates of CO2 and N2O were significantly positively correlated with the activities of soil urease and soil catalase. In summary,the rotation mode of spring wheat\|winter rapeseed\|common vetch combined with 25% nitrogen reduction can be used as a reasonable planting mode and nitrogen application system to achieve agricultural efficiency and emission reduction in oasis irrigation area. |
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