Effects of irrigation and nitrogen fertilization on the greenhouse gas emissions of a cropping system on a sandy soil in northeast Germany |
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| Institution: | 1. Leibniz-Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469 Potsdam, Germany;2. Humboldt-Universität zu Berlin, Faculty of Life Sciences, Chair Utilization Strategies for Bioresources, Hinter der Reinhardtstr. 8-18, 10115 Berlin, Germany,;3. Humboldt-Universität zu Berlin, Faculty of Life Sciences, Field Study and Research Station, Dorfstraße 9, 14974 Thyrow, Germany,;4. Humboldt-Universität zu Berlin, Faculty of Life Sciences, Division of Agronomy and Crop Science, Albrecht-Thaer-Weg 5, 14195 Berlin, Germany,;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China;2. College of Resources and Environmental Sciences, Northwest A & F University, Yangling 712100, China;3. Lab of Soil Microbiology and Nutrient Cycle, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Crop Science, Quality of Plant Products (340e), University of Hohenheim, 70593 Stuttgart, Schloss Westflügel, Germany;2. Institute of Crop Science, Nutritional Crop Physiology (340h), University of Hohenheim, 70593 Stuttgart, Germany;3. Rothamsted Research, Plant Sciences Department, Harpenden AL5 2JQ, UK;1. College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi, 712100, China;2. Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A＆F University, Yangling, Shaanxi, 712100, China;1. College of Resource and Environmental Sciences, China Agricultural University, 100193 Beijing, China;2. Department of Quality Monitoring for Vegetable, Shouguang Municipal, 262700 Shandong Province, China;3. College of Resource and Environmental Sciences, Qingdao Agricultural University, 266109 Qingdao, China;1. Department of Crop Science, Division of Plant Nutrition and Crop Physiology, University of Goettingen, Carl-Sprengel-Weg 1, 37075 Göttingen, Germany;2. School of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China;3. Soil Science of Tropical and Subtropical Ecosystems, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Buesgenweg 2, 37077 Göttingen, Germany |
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| Abstract: | Irrigation induces processes that may either decrease or increase greenhouse gas emissions from cropping systems. To estimate the net effect of irrigation on the greenhouse gas emissions, it is necessary to consider changes in the crop yields, the content of soil organic carbon and nitrous oxide emissions, as well as in emissions from the use and production of machinery and auxiliary materials. In this study the net greenhouse gas emissions of a cropping system on a sandy soil in northeast Germany were calculated based on a long-term field experiment coupled with two-year N2O flux measurements on selected plots. The cropping system comprised a rotation of potato, winter wheat, winter oil seed rape, winter rye and cocksfoot each under three nitrogen (N) fertilization intensities with and without irrigation. Total greenhouse gas emissions ranged from 452 to 3503 kg CO2-eq ha−1 and 0.09 to 1.81 kg CO2-eq kg−1 yield. Application of an adequate amount of N fertilizer led to a decrease in greenhouse gas emissions compared to zero N fertilization whereas excessive N fertilization did not result in a further decrease. Under N fertilization there were no significant differences between irrigation and non-irrigation. Increases in greenhouse gas emissions from the operation, production and maintenance of irrigation equipment were mainly offset by increases in crop yield and soil organic carbon contents. Thus, on a sandy soil under climatic conditions of north-east Germany it is possible to produce higher yields under irrigation without an increase in the yield-related greenhouse gas emissions. |
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| Keywords: | Greenhouse gas emissions Cropping systems Irrigation N fertilization |
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