| China is recognized as an agricultural country in the world,with agriculture accounting for11% of greenhouse gas emissions,and agricultural carbon emissions showing a trend of continuous growth.Moreover,the agricultural ecosystem is very complex,so the sources of agricultural greenhouse gases are complex and large.Therefore,slowing agricultural carbon emissions is one of the important measures to slow down climate warming.Across the country,Heilongjiang,Jilin and Liaoning provinces have become important grain-producing regions by virtue of their geographical location,climatic conditions and fertile soil.But in the dominant position is still the traditional extensive agricultural management mode,a large number of agricultural elements input is the choice of farmers to increase production and income.However,with the rapid development of agricultural modernization,the defects of traditional agriculture appear.Developing low-carbon agriculture is the trend of The Times and is the best choice.On the other hand,carbon emissions of different crops vary greatly,so it is of great significance to analyze temporal and spatial evolution characteristics of planting carbon emissions to further improve the emission reduction potential.This is one of the important reasons to study this problem in this paper.At present,most studies on carbon footprint take the whole agricultural production or all crops as the research object,and few studies on the calculation and evaluation of the carbon footprint of different crop production respectively,which restricts the supporting carbon sequestration and emission reduction technology and policy innovation direction for agricultural production of a certain crop or an important agricultural area.As the main grain producing area,northeast region plays an important role in national food security.For crop production,since it is directly related to food security,the goal of "carbon peak and carbon neutrality" must be established on the premise of food security.Therefore,it is urgent to understand the carbon emission characteristics of crop production.It is of great significance to investigate the carbon footprint differences of different crop production to promote the development of low-carbon agriculture.Therefore,this paper selects Northeast China as the research object to collect and collate the statistical data of the output,sown area and farmland production input of major food crops and cash crops in the three Northeast provinces from 2011 to 2021.Firstly,carbon uptake of seven crops is estimated,and then direct and indirect carbon emissions are estimated,and dynamic changes of net carbon sinks are described in detail.Finally,the driving factors of direct and indirect carbon emissions were analyzed respectively,and relevant conclusions were drawn,and suggestions were put forward for the development of low-carbon agriculture in Northeast China.The main research contents and research conclusions of this paper are as follows:1.The total agricultural output value of the three Northeast provinces increased from 412.94 billion yuan in 2011 to 762.49 billion yuan in 2021,a growth rate of 84.6%;In the past decade,the proportion of agricultural output in the total output of agriculture,forestry,animal husbandry and fishery exceeded 50 percent for seven consecutive years.The planting area and total output of corn have been the first among the seven crops in the three provinces of Northeast China,and the total carbon absorption is significantly higher than other crops.Rice is paddy crop,direct carbon emissions account for the largest proportion,carbon emission reduction space is very large.2.From 2011 to 2021,the total carbon absorption of industry generated by planting industry is in a state of fluctuating growth,the total direct carbon emission and indirect carbon emission of planting industry are in a downward trend,and the downward trend of indirect carbon emission is more obvious,making the total net carbon sink of planting industry in the three northeastern provinces show a trend of slow growth.3.The production scale factor promoted the direct carbon emission of maize and soybean,but inhibited the direct carbon emission of rice and wheat.The carbon intensity factor promoted the direct carbon emission of soybean,but inhibited the direct carbon emission of rice,wheat and corn.Production efficiency factors promote the direct carbon emission of rice,wheat and soybean,and inhibit the direct carbon emission of maize.In the process of crop production,the input of chemical fertilizers,pesticides,agricultural film and diesel oil showed a downward trend.Indirect carbon emission intensity factors,material production efficiency and production scale factors significantly promoted indirect carbon emissions from crop production,while material input intensity factors significantly inhibited indirect carbon emissions.Based on the systematic analysis,it is suggested to give full play to the geographical and resource advantages of the three provinces in Northeast China,closely focus on the national requirements for food production and low-carbon agriculture development,rationally arrange the planting structure,reduce the indirect carbon emissions caused by agricultural factor input,and promote the rapid development of low-carbon agriculture. |
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