Abstract:

The data of farmland ecosystem in Wuwei City from 2010 to 2022 were collated and calculated, and the total amount of carbon source / sink and its influencing factors were analyzed, so as to provide a basis for promoting the low-carbon, high-yield and sustainable development of agriculture in Wuwei City. Firstly, the agricultural ecosystem carbon source/sink formula was used to calculate the total agricultural carbon emissions and carbon absorption. Secondly, the LMDI model was applied to decompose the driving factors of agricultural carbon sources/sinks in Wuwei City. The results showed that compared with 2010, total agricultural carbon emissions in Wuwei City decreased by 14.42% in 2022, showing a downward trend, and total carbon sequestration increased by 31.66%, showing an upward trend. The structure of various carbon sources was: fertilizer (33.25%) > agricultural film (29.88%) > tillage (22.78%) > irrigation (14.91%) > machinery (0.19%), fertilizer had the fastest rate of decline; the structure of various carbon sinks was: maize (52.67%) > wheat (19.37%) > vegetables (13.87%) > oilseeds (9.17%) > legumes (1.76%) > potatoes (1.64%) > melons (1.52%). From the perspective of influencing factors, economic factors played a promoting role in carbon emissions, while carbon sink coefficient, carbon sink structure, and carbon sink technology played a promoting role in carbon absorption. By calculating the total amount of carbon sources/sinks in Wuwei City from 2010 to 2022 and analyzing the influencing factors, it was shown that reasonable control of agricultural production inputs and optimization of industrial structure could effectively reduce agricultural carbon emissions.

Key words: Wuwei City, agricultural ecosystem, carbon source, carbon sink