云南省农田生态系统碳源/汇变化分析

Analysis of Carbon Source/Sink Changes in Farmland Ecosystems in Yunnan Province

基于《云南统计年鉴》和联合国政府间气候变化专门委员会评估报告中的数据,采用净碳汇法对云南省农田生态系统碳汇量进行了核算,并从碳吸收和碳排放角度核算了云南省农田生态系统净碳汇。结果表明:(1)2005—2021年云南省农田净碳汇量从2005年的1446.66万t上升到2021年的1849.73万t,其中最低净碳汇量为1425.40万t,最高净碳汇量为1849.73万t。(2)从农田生态系统碳排放来源看,化肥、翻耕及农业机械总动力碳排放量占比相对较大;从农田生态系统碳吸收情况来看,粮食作物与经济作物的碳吸收比例占比较大。综上所述,在农田耕作过程中,应尽快推进绿色低碳新能源农业机械设备,提高施肥技术,进一步减肥增产,推广科学合理的农田技术,充分发挥区域协调作用,促进农田低碳绿色发展。

Based on the data in the Statistical Yearbook of Yunnan Province and the assessment report of the United Nations Intergovernmental Panel on Climate Change,the net carbon sink method was used to calculate the carbon sink of the farmland ecosystem in Yunnan Province.The net carbon sink of the farmland ecosystem in Yunnan Province was calculated from the perspective of carbon absorption and carbon emissions.The results showed that:(1)The net carbon sink of the farmland ecosystem in Yunnan Province from 2005 to 2021 increased from 14.4666 million tons in 2005 to 18.4973 million tons in 2021,with a minimum carbon sink of 14.254 million tons and a maximum carbon sink of 18.4973 million tons.(2)In carbon emissions,the total power carbon emissions of fertilizer,tillage and mechanised agriculture account for a relatively high proportion,and the carbon absorption of food crops and Cash crop is relatively large in carbon absorption.In conclusion,in the process of farmland cultivation,we should promote low-carbon and green new energy agricultural machinery and equipment as soon as possible,improve fertilization technology,further reduce weight and increase production,promote scientific and reasonable farmland technology,fully play the role of regional coordination,interact and exchange,and promote low-carbon and green development of farmland.