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| 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 |
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