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| Effects of maize straw application on organic carbon's priming effect and temperature sensitivity in brown earth |
| Received:July 09, 2019 |
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| KeyWord:13C-labeled maize straw;soil organic carbon;priming effect;temperature sensitivity |
| Author Name | Affiliation | E-mail | | LI Ai-meng | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Northeast Cultivated Land Conservation of Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | LI Hui | College of Forest, Shenyang Agricultural University, Shenyang 110866, China | | | PEI Jiu-bo | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Northeast Cultivated Land Conservation of Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | peijiubo@syau.edu.cn | | XIE Ning-hui | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Northeast Cultivated Land Conservation of Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | LIU Yu-wei | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Northeast Cultivated Land Conservation of Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | WANG Jing-kuan | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Northeast Cultivated Land Conservation of Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | |
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| Abstract: |
| To distinguish the effects of maize straw carbon(C)on the priming effect(PE)of native soil organic carbon(SOC)and its temperature sensitivity, a laboratory 13C tracing incubation experiment was carried out for 450 days with Brown Earth at 25℃(microbial suitable temperature)and 18℃(average temperature at crop growing season). The CO2-C content and its 13C values were determined periodically after 13C-labeled maize straw was added to high-fertility Brown Earth(HF, continuous application of decomposed pig manure for 30 years)with SOC content of 17.03 g·kg-1, and low-fertility Brown Earth(LF, no fertilizer treatment for 30 years)with SOC content of 10.70 g·kg-1. The results showed that the accumulation of SOC in HF was higher, and higher temperature increased the cumulative mineralization of SOC. The relative PE of SOC with LF changed owing to the increase in temperature, showing a trend of relatively positive PE that quick declined from 0 to 140 days, longer duration of negative PE from 140 to 360 days, and slightly higher positive PE after 360 days. Meanwhile, the cumulative relative PE was higher at 18℃ than at 25℃. In general, the temperature sensitivity of SOC both in HF and LF decreased over time. The addition of maize straw could slow down the declining trend. The temperature sensitivity of SOC in LF was higher than in HF before 140 days; the trend reversed after 140 days. The temperature sensitivity from native SOC presented strong variations, which were higher in LF than in HF from 0 to 300 days; the trend reversed after 300 days. These results suggest that the decomposition of maize straw was influenced by soil fertility(different SOC levels)and environment temperature, resulting in variations in the PE of SOC. The incubation times of 140 days and 300 days should be the important time variations. |
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