| Responses of soil organic carbon and crop yield to surface mulching with straw and plastic film in winter wheat field using DNDC model |
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| DOI：10.7606/j.issn.1000-7601.2022.01.05 |
| Key Words: DNDC model straw mulching plastic film mulching soil organic carbon yield winter wheat |
| Author Name | Affiliation | | YAN Xuebin | College of Urban and Environmental Science，Northwest University, Xi’an, Shaanxi 710127, China
Key Laboratory of Surface System and Environmental Carrying Capacity of Shaanxi Province, Xi’an, Shaanxi 710127, China | | WANG Jun | College of Urban and Environmental Science，Northwest University, Xi’an, Shaanxi 710127, China
Key Laboratory of Surface System and Environmental Carrying Capacity of Shaanxi Province, Xi’an, Shaanxi 710127, China | | WANG Kefeng | The college of life sciences，Northwest University, Xi’an, Shaanxi 710069, China | | BAI Hongying | College of Urban and Environmental Science，Northwest University, Xi’an, Shaanxi 710127, China
Key Laboratory of Surface System and Environmental Carrying Capacity of Shaanxi Province, Xi’an, Shaanxi 710127, China |
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| Abstract: |
| The long\|term trends of winter wheat field soil organic carbon (SOC) and crop yield to straw mulching and plastic film mulching were modelled using the Denitrification\|decomposition (DNDC) model based on a winter wheat mulching field experiment on the Loess Plateau of China. Strong consistence was found between the modelled values with field observations for both SOC and yield, indicating that DNDC was a useful tool to test the long\|term effects of surface mulching on these two indicators. At a 50-year scale, the SOC content at 0~50 cm depth showed a downward trend under no mulching and plastic film mulching, with an average annual change of -11.3 kg·hm-2 and -25.2 kg·hm-2, respectively. On the contrary, the SOC content presented an increasing trend under straw mulching at rates of 4 500 kg·hm-2 and 9 000 kg·hm-2, with an average annual change of 116.3 kg·hm-2 and 256.9 kg·hm-2, respectively. It was manifested as a trend of more increments in the first 5 years, and a decrease in later increments and reaching equilibrium in the 40~50 years. The simulated wheat yield ranged from 5 713.3 kg·hm-2 to 7 046.7 kg·hm-2. Compared with no mulching, wheat yield increased by 2.7%, 9.8% and 13.4% with plastic film mulching, and straw mulching at 4 500 kg·hm-2 and 9 000 kg·hm-2 averaged across 50 years, respectively. There was a significant positive correlation between the modelled SOC content and wheat yield. In general, compared with no mulching, plastic film mulching and straw mulching could be a reliable management practice for long\|term carbon sequestration and yield increase in the dryland agricultural systems on the Loess Plateau. |
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