Short-term effects of sewage sludge compost application on emissions of greenhouse gases from soil
JIANG yue1, ZHOU Ji1, YANG Yu-han1, CHEN Hong1,2, ZHANG Cheng1,2
1. College of Resources and Environment, Southwest University, Chongqing 400715, China;
2. Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China
Two different sewage sludge composting products (with and without biochar) were applied in field to study short-term impacts of their application on the greenhouse gases (CH4, CO2 and N2O) emission from soil. The results indicated that N2O emissions mainly occurred in the first three weeks, with the emission amount accounting for 87.9%~95.6% of the total emissions during the observation period. The emission amount of N2O increased with the application amount of compost (P<0.05), and N2O emission from bare land was higher than that of crop plants treatment. The application of sludge composting can lead to the reduction of the N2O emissions from soil, and the N2O reduction amount increased with the increase of the fertilizing amount (P<0.05). CH4 emission fluxes showed negative values in the early and late stages of the experiment, indicating that soil could adsorb CH4. The absorption of CH4 took place mainly after 18 days, accounting for 52.1%~66.7% of the total absorping amounts. The absorping amount of CH4 in soil with biochar compost was 35.2% to 62.2% less than that in soil without biochar, and higher absorping amount of CH4 appeared in bare land when compared with the land with planting crops (P<0.05). CO2 emissions mainly occurred after 18days, accounting for 50.5%~61.8% of the total emission. The planting crops can promote the CO2 emission in soil, which was 1.34~1.57 times that of the bare land. Thus, it can be speculated that land application of compost was a weak sink of CH4 and a source of N2O and CO2 emissions during the observation period. The application of sludge composting can lead to the increase of the emissions of N2O and CO2 in soil. Sludge compost with biochar in short-term could reduce the N2O and CO2 emissions from soil, and the biochar played an important role in reducing the greenhouse gas emissions, as the emission amounts from soil with biochar compost was 20.41% to 62.51% less than that in soil without biochar.
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