| 引用本文: | 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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| 玉米大豆间作对农田土壤N2O排放的影响 |
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陈津赛1, 高阳1, 王广帅2, 张莹莹2
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1.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/;2.中国农业科学院农田灌溉研究所
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| 摘要: |
| 间作种植影响作物对土壤水分和养分资源的竞争与利用,也将会影响土壤的温室气体排放。然而,目前关于间作种植对农田温室气体排放的影响机理还不明晰。为此,本试验设置单作玉米SM120(氮素施用量为120kg/ hm2),单作玉米SM240(氮素施用量为240kg/ hm2),单作大豆SS(氮素施用量为120kg/ hm2),玉米/大豆间作IMS(氮素施用量为120kg/ hm2)四种处理,对比分析了单作和间作农田的土壤水分、土壤温度、土壤无机氮以及土壤N2O排放通量的变化规律。研究结果表明,不同处理间的土壤充水孔隙度(WFPS)和0~10cm土壤温度均存在显著性差异(P<0.05),且SM120处理显著高于其余三个处理。全生育期内,IMS处理的0~20cm土壤无机氮含量比SS降低了20.40%,比SM120降低了5.30%,比SM240降低了29.30%(P<0.05)。在整个生育期内,IMS的N2O平均排放通量分别比SM120、SM240和SS处理降低了31.98%、39.16%、47.80%(P<0.001),表明IMS处理可以极显著的降低土壤N2O排放通量。 IMS处理的N2O平均累计排放量及全球增温潜势分别比SM120、SM240、SS降低了36.71%、41.52%、49.03%(P<0.001)。由此可以看出,玉米大豆间作种植能够提高作物系统对N素的吸收量,从而降低土壤无机氮含量,进而降低农田土壤N2O的排放。 |
| 关键词: 间作;玉米;大豆;N2O;全球增温潜势 |
| DOI： |
| 分类号:s19 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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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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