Inter-annual variation patterns of carbon footprint of farmland ecosystems in industrial provinces in China--Guangdong Province as an example

The abstract must not include a heading. It should be no more than 200 words long and contain no references or subheadings.The sequestration of carbon by agricultural ecosystems is an important part of the world carbon cycle and plays an important role in carbon reduction in all Chinese provinces, especially industrial provinces. Taking Guangdong Province, a major industrial province, as an example, and estimating the carbon emissions, carbon sequestration, and carbon footprint of Guangdong's farmland ecosystems and analyse the inter-annual dynamics of the three, to provide a theoretical basis for the formulation of carbon reduction policies and industrial restructuring in Guangdong and other provinces with similar industrial structures in the context of the “dual carbon” target. The study shows that, over the past 20 years, the annual average carbon emissions from farmland in Guangdong Province has been 3.7624 million , with the overall variation is basically the same, and the main factor of total carbon emissions is the amount of nitrogen fertilizer applied. The overall carbon sequestration capacity of Guangdong's farmland ecosystems showed a decreasing trend, with a decrease of 10.32%, and the average annual carbon sequestration amount was 19.0363 millionand the main influencing factor of the total carbon sequestration is the economic production of paddy and sugar cane. The average annual carbon footprint of Guangdong's farmland ecosystems is 531,100, which is in a state of carbon ecological surplus, at the same time the carbon surplus and carbon footprint show a decreasing trend year by year.