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| Simulation of Soil Carbon Contents and Crop Yields in Long-term Fertilized Cropland in Guanzhong Area Using DNDC Model |
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| KeyWord:DNDC model; fertilization; soil organic carbon; carbon cycling; crop yields |
| Author Name | Affiliation | | CHEN Hai-xin | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | SUN Ben-hua | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | FENG Hao | Institute of Water Saving Agriculture in Arid Regions of China, Yangling, 712100, China
National Engineering Research Center for Water Saving Irrigation at Yangling, Yangling, Shaanxi 712100, China | | ZHAO Ying | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | ZHANG Yan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China |
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| Abstract: |
| Land use changes may have great impacts on dryland agriculture in the Loess Plateau of China, one of the most fragile agro-ecosystems in the world. Here we investigated the variation of soil organic carbon（SOC） and crop yields in dryland under long-term different fertilization in Guanzhong plain area during 20 years using DNDC model. There were five treatments including no fertilization control（CK）, inorganic fertilizers（NPK）, NPK combined with straw（SNPK）, NPK combined with low manure（M1NPK）, and NPK combined with high manure（M2NPK）. In the CK treatment, SOC and crop yields were significantly reduced. The NPK treatment promoted crop production, but had little effect on SOC, which was similar to that in CK. However, both SOC and crop yields were increased in the SNPK, M1NPK and M2NPK treatments, with the greatest effect observed in the M2NPK. These observed data were used to calibrate and verify DNDC model. The model showed good fitting to measured SOC and crop yields, and thus could be used to predict SOC and crop yields dynamics. The prediction by the model indicated that combination of inorganic fertilizers and manure could not only enhance crop aboveground and underground biomass and heterotrophic respiration, but also increase soil carbon storage. This result would shed light on fertilization practices in this region. |
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