Abstract
Appropriate agricultural practices for carbon sequestration and emission mitigation have a significant influence on global climate change. However, various agricultural practices on farmland carbon sequestration usually have a major impact on greenhouse gas (GHG) emissions. It is very important to accurately quantify the effect of agricultural practices. This study developed a platform—the Denitrification Decomposition (DNDC) online model—for simulating and evaluating the agricultural carbon sequestration and emission mitigation based on the scientific process of the DNDC model, which is widely used in the simulation of soil carbon and nitrogen dynamics. After testing the adaptability of the platform on two sampling fields, it turned out that the simulated values matched the measured values well for crop yields and GHG emissions. We used the platform to estimate the effect of three carbon sequestration practices in a sampling field: nitrogen fertilization reduction, straw residue and midseason drainage. The results indicated the following: (1) moderate decrement of the nitrogen fertilization in the sampling field was able to decrease the N2O emission while maintaining the paddy rice yield; (2) ground straw residue had almost no influence on paddy rice yield, but the CH4 emission and the surface SOC concentration increased along with the quantity of the straw residue; (3) compared to continuous flooding, midseason drainage would not decrease the paddy rice yield and could lead to a drop in CH4 emission. Thus, this study established the DNDC online model, which is able to serve as a reference and support for the study and evaluation of the effects of agricultural practices on agricultural carbon sequestration and GHG emissions mitigation in China.
Highlights
Greenhouse gas (GHG) emissions from the farmland system have a significant impact on global climate change
Utilizing the Denitrification Decomposition (DNDC) online model, this study estimated the effect of three common carbon sequestration measures: nitrogen fertilization reduction, straw residue and midseason drainage
The actual nitrogen fertilization applied in the experimental field in Shanghai Engineering carbon sequestration practices and gave the recommendation
Summary
Greenhouse gas (GHG) emissions from the farmland system have a significant impact on global climate change. The DNDC model is a computer model that contains a relatively large suite of biophysical and biogeochemical processes to describe complex transport and transformations of carbon and nitrogen in terrestrial ecosystems under both aerobic and anaerobic conditions [10] It connects the chemical reactions in soil with the ecological drivers (such as atmosphere, soil, crops and farming practices) and environmental factors (such as temperature, moisture, pH, Eh, radiation) and simulates carbon and nitrogen dynamics in the complex systems to estimate and predict soil organic carbon (SOC) change, crop yield and GHG emissions [11]. The platform could help users to (1) query necessary parameters for model simulation online directly; (2) run the simulation model online and acquire visual simulation results; (3) estimate the carbon sequestration effects of various agricultural practices; (4) download original simulated data for further research
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