Analysis of Impacts and Regulation Differences on Soil N2O Emissions from Two Typical Crop Systems Under Drip Irrigation and Fertilization
LEI HaoJie,1, LI GuiChun2, KE HuaDong1, WEI Lai1, DING WuHan1, XU Chi1, LI Hu,11Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Research Center for Agricultural Green Development in China, Beijing 100081 2Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081
Abstract 【Objective】The aim of this study was to ascertain the impact differences and emission reduction contribution of drip irrigation and fertilization on N2O emissions from farmland of typical planting types in North China, and to clarify its comprehensive control mechanism, so as to provide scientific support and technical reserves for the optimization and control of regional agricultural production carbon and nitrogen and the promotion and application of drip fertilization technology in North China.【Method】Two typical crop planting modes (winter wheat-summer corn rotation and facility vegetable fields) were selected as the research objects, and four treatments were set, namely control (CK), conventional flood irrigation fertilization (FP), drip irrigation fertilization (FPD), and drip irrigation Optimized fertilization (OPTD). Continuous static observation and analysis of soil N2O emissions from these two systems were performed by using automatic static chamber-gas chromatography.【Result】The changes of N2O fluxes from the two crop systems were significantly positively correlated with the soil temperature of 5cm (P<0.05), and both crop systems had the highest N2O emission peak during the basal fertilizer period. In the greenhouse vegetable and food crop systems, the total cumulative N2O emissions of FP treatment were the highest, reaching (5.47±0.23) and (1.70±0.02) kg N·hm-2, respectively. For the N2O emission intensity per unit yield, the FP treatment in the facility vegetable system was (159.72±2.47) g N·t-1, which was much lower than the grain crop system (258.41±6.35) g N·t-1. The focus of future N2O emission reduction was still food crop production. Drip irrigation and fertilization could significantly reduce the total N2O emissions of the two systems. Compared with FP treatment, drip irrigation and fertilization in facility vegetable systems could significantly reduce the total N2O emissions by 19.0% (P<0.05), while in food crop systems could be reduced by 35.0% (P<0.05). In addition, when the nitrogen application rates of the two systems were reduced by 50% and 30%, the emission reduction contribution was expanded to 30.2% and 45.8%, respectively, while ensuring crop yields.【Conclusion】There were obvious differences in the characteristics of soil N2O emissions from facility vegetable and food crop systems. The N2O emission intensity of food crop production was significantly higher than that of facility vegetable production, and the further attention should be paid. At the same time, drip irrigation and fertilization technology could reduce N2O emissions in two typical crop systems in North China farmland, but it had a greater contribution to N2O emission reduction in the winter wheat-summer corn rotation system, and it had the potential for further application in the North China Plain. Keywords:drip irrigation and fertilization;facility vegetables;food crops;N2O;emission reduction contribution
PDF (1053KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 雷豪杰, 李贵春, 柯华东, 魏崃, 丁武汉, 徐驰, 李虎. 滴灌施肥对两种典型作物系统土壤N2O排放的影响及其调控差异[J]. 中国农业科学, 2021, 54(4): 768-779 doi:10.3864/j.issn.0578-1752.2021.04.009 LEI HaoJie, LI GuiChun, KE HuaDong, WEI Lai, DING WuHan, XU Chi, LI Hu. Analysis of Impacts and Regulation Differences on Soil N2O Emissions from Two Typical Crop Systems Under Drip Irrigation and Fertilization[J]. Scientia Acricultura Sinica, 2021, 54(4): 768-779 doi:10.3864/j.issn.0578-1752.2021.04.009
1-设施蔬菜系统Facility vegetable system;2-粮食作物系统Food crop system图中圆形或三角形的图形大小表示相关性系数值的高低,图形越大,相关系数越大 Fig. 2Correlation analysis of N2O emission flux with 5 cm soil temperature, WFPS and air temperature
The size of the circle or triangle in the figure represents the value of the correlation coefficient. The larger the size, the larger the correlation coefficient
Table 3 表3 表3设施蔬菜系统和粮食作物系统各处理季度N2O累积排放总量及排放系数 Table 3Cumulative emissions and emission coefficients of the facility vegetable system and food crop system
处理 Treatment
设施菜地系统 Facility vegetable system
粮食作物系统 Food crop system
排放总量 Cumulative emissions (kg N·hm-2)
排放系数 Emission coefficient (%)
排放总量 Cumulative emissions (kg N·hm-2)
排放系数 Emission coefficient (%)
CK
1.50±0.12d
—
0.43±0.02d
—
FP
5.47±0.23a
0.57±0.05a
1.70±0.02a
0.47±0.01a
FPD
4.43±0.14b
0.42±0.00b
1.11±0.03b
0.29±0.01b
OPTD
3.82±0.06c
0.66±0.04a
0.92±0.10c
0.31±0.04b
不同字母表示系统内处理之间的N2O排放总量差异显著(P<0.05) Different letters indicate significant differences in total N2O emissions between treatments in the same system (P<0.05)
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