| Cite this article: | 陈津赛,高阳,王广帅,等.玉米大豆间作对农田土壤N2O排放的影响[J].灌溉排水学报,2020,(9):-. |
| chenjinsai,gaoyang,wangguangshui,et al.玉米大豆间作对农田土壤N2O排放的影响[J].灌溉排水学报,2020,(9):-. |
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| Effects of Intercropping of Soybean and Maize on Soil N2O EmissionsJinsai Chen1,2, Guangshuai Wang1, Yingying Zhang1, Yang Gao1 |
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chenjinsai1, gaoyang2, wangguangshui1, zhangyingying1
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1.Farmland Irrigation Research Institute;2.农业农村部作物需水与调控重点实验室/中国农业科学院农田灌溉研究所/
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| Abstract: |
| Intercropping affects the competition and utilization of soil water and nutrients by crops, and also impacts the greenhouse gas emissions of soil. However, the effects of intercropping on the greenhouse gas emissions is still unclear. Therefore, an experiment with four treatments, i.e. sole crop maize with nitrogen rate of 120 kg hm-2 (SM120), sole crop maize with nitrogen rate of 240 kg hm-2 (240), sole crop soybean with nitrogen rate of 120 kg hm-2 (SS) and intercropping of maize and soybean with nitrogen rate of 120 kg hm-2 (IMS) was carried out to compare soil moisture, soil temperature, soil inorganic nitrogen and N2O emission between monoculture and intercropping. The results showed that there were significant differences in w the water-filled pore space (WFPS) and soil temperature in the soil depth of 0-10cm between different treatments (P<0.05), and of the value in SM120 was significantly higher than that in other treatments. In the whole growth period, compared with SS, SM120, and SM240, the inorganic nitrogen content in the 0-20cm soil layer in IMS decreased by 20.40% , 5.30%, and 29.30% (P<0.05), respectively. The average N2O emission flux in IMS was reduced by 31.98%, 39.16% and 47.80% (P<0.001) compared with that of SM120, SM240 and SS, indicating that intercropping could significantly reduce the N2O emission flux of soil. Compared with SM120, SM240 and SS, the average cumulative N2O emission and global warming potential in IMS decreased by 36.71%, 41.52% and 49.03%, respectively (P<0.001). It can be concluded that intercropping of soybean and maize can improve the nitrogen absorption of the system, and reduce the inorganic nitrogen content in the top soil, and thereby decrease the nitrous oxide emission of soil in the intercropping. |
| Key words: Intercropping; Maize; Soybean; N2O; Global warming potential |
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