绵阳市农田生态系统碳足迹和碳生态效应分析  

Analysis of Carbon Footprint and Carbon Eco-efficiency of Farmland Ecosystem in Mianyang City

作　　者：邹介石 杨海青[1] Zou Jieshi;Yang Haiqing(College of Geographical Sciences,China West Normal University,Nanchong 637009,Sichuan,China)

机构地区：[1]西华师范大学地理科学学院,四川南充637009

出　　处：《绿色科技》2024年第15期237-246,253,共11页Journal of Green Science and Technology

摘　　要：农田生态系统具有碳源、碳汇双重特质,是陆地生态系统的重要组成部分,探究农田碳足迹对农田生态系统的可持续发展具有重要意义。以2002-2021年绵阳市农田生产投入、农作物产量和农业生产总值等数据,构建农田生态系统碳足迹模型与LMDI因素分解模型,对碳足迹时空变化特征、碳生态效率驱动因素进行探讨并提出建议。结果表明:①2002-2021年绵阳市农田生态系统碳排放总量与碳排放强度呈现出先增加后减少的趋势;空间分布上,碳排放总量呈现出北低南高的格局;②绵阳市农田生态系统有很强的碳汇能力,除2006年外,农田生态系统碳吸收总量以及碳吸收强度逐年稳步增长(1.84%)。不同农作物碳吸收总量贡献比较为:水稻(28.61%)>玉米(24.00%)>油菜(18.54%)>小麦(17.98%);③2002-2021年绵阳市农田生态系统碳足迹均小于当年的耕地面积,年均碳足迹耕地占比20.30%,属于碳生态盈余;④经济因素是绵阳市农田生态系统碳生态效率水平提高的主要驱动因素,结构因素对碳生态效率贡献值偏低,劳动力因素、效率因素对碳生态效率水平主要起抑制作用;⑤建议优化化肥、农药、农膜等农业农用物资的使用量以及科学提高农作物产量、调整种植结构来提升绿色农业发展水平。Farmland ecosystem has the dual characteristics of carbon source and carbon sink,which is an important part of terrestrial ecosystem.It is of great significance to explore the carbon footprint of farmland for the sustainable development of farmland ecosystem.In this study,the carbon footprint model and LMDI factor decomposition model of farmland ecosystem were constructed based on the data of farmland production input,crop yield and gross agricultural product in Mianyang City from 2002 to 2021.The spatial and temporal variation characteristics of carbon footprint and the driving factors of carbon eco-efficiency were discussed and suggestions were put forward.The results showed that:①From 2002 to 2021,the total carbon emission and carbon emission intensity of farmland ecosystem in Mianyang City showed a trend of increasing first and then decreasing.In terms of spatial distribution,the total amount of carbon emissions shows a pattern of low in the north and high in the south;②The farmland ecosystem in Mianyang City has a strong carbon sink capacity.Except for 2006,the total carbon absorption and carbon absorption intensity of the farmland ecosystem increased steadily year by year(1.84%).The contribution ratio of total carbon absorption of different crops was:rice(28.61%)>corn(24.00%)>rape(18.54%)>wheat(17.98%);③From 2002 to 2021,the carbon footprint of farmland ecosystem in Mianyang City was less than the area of cultivated land in that year.The average annual carbon footprint of cultivated land accounted for 20.30%,which was a carbon ecological surplus;④Economic factors are the main driving factors for the improvement of carbon eco-efficiency level of farmland ecosystem in Mianyang City.The contribution value of structural factors to carbon eco-efficiency is low,and labor factors and efficiency factors mainly inhibit the level of carbon eco-efficiency.⑤It is recommended to optimize the use of agricultural materials such as chemical fertilizers,pesticides,and agricultural films,scientifically increase cro

关 键 词：农田生态系统 碳足迹 LMDI 碳生态效率 绵阳市 

分 类 号：S181[农业科学—农业基础科学]