农田生态系统碳源/汇时空演变因素分析OACHSSCD

Based on the data on agricultural inputs and crop sowing areas in Heilongjiang Province,the article used the LMDI decomposition model to measure the carbon sources/sinks of farmland ecosystems in the province from 2008 to 2021.The results showed that:①Carbon emissions from farmland ecosystems in Heilongjiang Province showed a rapid increase followed by a slow decrease,with CH4 produced by rice cultivation accounting for the highest proportion of carbon emissions at 59.66%.Carbon sequestration generally increased with an average annual growth rate of 3.85%,in which corn and rice increased greatly.②In terms of spatial change,carbon emissions per unit of the sown area showed a higher distribution pattern in the central and eastern parts of the country than in other regions,and carbon sequestration per unit of the sown area showed a higher distribution pattern in the east,south and west than in the north.③The analysis of carbon source/sink influencing factors shows that improving agro-ecological efficiency,optimizing agricultural production structure and controlling the scale of labour can effectively reduce carbon emissions.The carbon sink coefficient and the level of carbon sink technology have a promoting effect on carbon absorption,and in the future,we can strengthen precise management,improve the efficiency of intelligent agriculture,and enhance the capacity of carbon sinks.