以蚯蚓處理咖啡渣之溫室氣體排放與增匯
Other Title
The Impact of Earthworm Treatment of Spent Coffee Grounds on Greenhouse Gas Emissions and Soil Carbon Sequestration
Journal
2025臺大學士論文獎
Date Issued
2025
Author(s)
Chia-Hsuan Chang
Advisor
Abstract
Coffee grounds, a common organic waste, have potential for soil amendment but may increase soil CO₂ and N₂O emissions. However, the direct addition of coffee grounds may enhance soil emissions of carbon dioxide (CO₂) and nitrous oxide (N₂O). Earthworms hav e been reported to reduce N₂O emissions and enhance organic matter stability. This study investigates the effects of earthworms on greenhouse gas emissions and carbon nitrogen transformations during coffee ground decomposition. Based on previous studies, b oth earthworms and coffee grounds individually increase CO₂ and N₂O emissions. This study hypothesized that the interaction between earthworms and coffee grounds would mitigate N₂O emissions by enhancing organic matter stability and improving soil aeration . To test this hypothesis, an incubation experiment was conducted to measure greenhouse gas emissions, nitrogen transformations, and organic matter changes. The results showed that coffee ground addition increased N₂O and CO₂ emissions, likely due to a priming effect caused by its high organic content. However, contrary to our hypothesis, earthworms further elevated emissions. This may be due to their enhancement of nitrogen mineralization and stimulation of denitrification. Additionally, earthworms may hav e consumed labile organic carbon in the early stage of the experiment, further promoting nitrogen loss. Despite increasing greenhouse gas emissions, earthworms contributed to soil carbon stabilization, which may support long term carbon sequestration. These findings highlight the complex role of earthworms in organic matter decomposition and their potential implications for soil carbon and nitrogen dynamics.
Subjects
coffee grounds
earthworms
greenhouse gases
soil organic carbon
nitrogen cycle
Publisher
國立臺灣大學農業化學系
Description
獎項：校長獎；指導教授：王尚禮
Type
thesis
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