| 摘要: |
| 【目的】从资源耦合的视角揭示农业灌溉过程的碳排放机理。【方法】首先对河南省48个典型村庄不同作物灌溉过程的碳排放进行了核算，然后对河南省县域空间农业灌溉碳排放进行了模拟，并对县域单元的碳排放效率进行了类型区划分。【结果】河南省农业灌溉过程的碳排放呈现较大的区域差异和作物差异。在空间上，河南省农业用水量呈南高北低、西高东低的态势，而灌溉耗能量与碳排放量呈北高南低、东高西低的态势，因此，农业灌溉过程的碳排放量与用水量关联度较低而与耗能量关联度较高；在作物类型上，河南省小麦的灌溉碳排放强度为105.3 kg/hm2、玉米的灌溉碳排放强度为99.5 kg/hm2、花生的灌溉碳排放强度为73.9 kg/hm2。河南省小麦和玉米的灌溉碳排放强度呈西高东低、北高南低的态势；花生的灌溉碳排放高强度地区主要集中于黄河流域以及淮河流域，而南阳市南部地区以及周口市的花生碳排放强度较低。基于农业灌溉碳排放效率的高低，将河南省分为4类地区：低碳排放效率区（C<40 t/t）、中碳排放效率区（40240 t/t）。【结论】建议未来对不同地区灌溉方式进行差别化管理，针对不同地形、气候和作物种植区，应结合水资源可获得情况确定合理的灌溉方式，以减少灌溉过程中的水能消耗与碳排放。 |
| 关键词: 农业灌溉；碳排放；水-能关联；河南省 |
| DOI：10.13522/j.cnki.ggps.2019326 |
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| Carbon Emissions from Irrigated Agricultural Soils in Henan Province: Analyzed from the Water-energy Nexus Point of View |
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DU Jingxin, ZHAO Rongqin, XIAO Liangang, YANG Qinglin, WANG Shuai, YANG Wenjuan, ZHANG Huifang, WANG Tianyu, LI Yongtao, FENG Hao
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1.School of Surveying and Geo-informatics, North China University of Water Resources and Electric Power,Zhengzhou 450046, China; 2. Key Research Institute of Yellow River Civilization and Sustainable Development & Collaborative Innovation Center on Yellow River Civilization of Henan Province, Henan University, Kaifeng 475001, China
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| Abstract: |
| 【Objective】Carbon emission from soils is mediated by a multitude of abiotic and abiotic processes, and this paper analyzed it from the water-energy nexus point of view based on data in Henan province.【Method】 We first calculated the carbon emission from different irrigated croplands in 48 typical villages, and then simulated carbon emission from the croplands at country scale across the province. The simulated results were used to classify carbon emission efficiency of the irrigated croplands in different counties. 【Result】The carbon emission instigated by irrigated croplands in the province varies between counties and crops, and it was related to agricultural water usage as well. Spatially, the amount of water used by agriculture is high in the south and west and low in the north and east, while the energy consumption by agricultural irrigation and carbon emission are high in the east and north and low in the west and south. As such, the nexus between carbon emission and water consumption is lower than energy consumption for irrigation. In terms of crop types, carbon emission intensity of irrigation was 105.3 kg/hm2 for wheat, 99.5 kg/hm2 for corn and 73.9 kg/hm2 for peanut. Carbon emissions from irrigated wheat and maize are high in the west and north, and low in the east and south. The carbon emissions from irrigated peanuts are high in the Yellow river and Huaihe river basins, and low in the south of Nanyang city and Zhoukou city. The carbon emission efficiency of irrigated croplands can be divided into four zones across the province: low carbon emission efficiency zone (C<40 t/t), moderate carbon emission efficiency zone (40240 t/t).【Conclusion】Different counties in the province should take different irrigation strategies based on available water resources, topography, climate and areas of croplands in order to reduce water energy-consumption and carbon emissions. |
| Key words: agricultural irrigation; carbon emissions; water-energy nexus; Henan province |
