地质通报2025，Vol.44Issue(7)：1254-1271,18.DOI:10.12097/gbc.2024.05.039
基于碳足迹的黑龙江省黑河市农田生态系统碳源/汇时序变化及其对碳中和的贡献
Carbon footprint-based time-series changes of carbon sources/sinks in farmland ecosystems and its contribution to carbon neutrality in Heihe City,Heilongjiang Province,China
摘要
Abstract
[Objective]In recent years,carbon footprint analysis has been widely applied to the assessment of carbon sources/sinks in farmland ecosystems,but Chinese prefecture and municipal level studies still have problems such as narrow time span and lack of measurement of key processes(e.g.,N2O emissions from farmland,CH4 release from rice paddies,and soil respiration and sequestration),which lead to bias in the assessment of regional carbon sources/sinks and constrain the precise implementation of the"dual-carbon"policy.This study aims to reveal the time-series evolution of carbon sources/sinks in farmland ecosystems in Heihe City,Heilongjiang Province,over a 40-year period(1984-2023),to quantify the potential of carbon sinks to contribute to carbon neutrality,and to identify the dominant factors of carbon footprints,so as to provide data support for the local government to realize the goal of"dual-carbon".[Methods]Based on the statistical data of crop sown area,production and agricultural inputs in Heihe City during the 40-year period(1984-2023),and utilizing the carbon footprint model of agricultural ecosystems,we comprehensively assessed the total amount of carbon sources/sinks of agricultural ecosystems in Heihe City,as well as the contribution index of carbon sinks in the region.[Results]①The carbon emissions from farmland ecosystems in Heihe City from 1984 to 2023 showed a continuous growth trend,with an average annual growth rate of 2.84%.During this period,both carbon absorption and carbon footprint showed a fluctuating upward trend,but the total amount of carbon absorbed was much higher than the total amount of carbon emitted,and the ratio of the two was at the level of 2.59∶1.②From the perspective of carbon emission structure,soil respiration and farmland N2O emission are the main sources of carbon emission,accounting for 58.80%and 32.22%respectively;chemical fertilizer,pesticide application and agricultural irrigation account for a significant proportion of carbon emission from inputs of agricultural means of production(74.51%,12.26%,and 8.66%),although the proportion of carbon emission generated by the use of agricultural film is relatively low(1.33%),it still needs to be paid enough attention.③The amount of carbon absorbed by farmland ecosystems is mainly related to the type of crops and their yields,with grain crops and soil constituting the bulk of farmland carbon sinks,accounting for 84.08%and 10.10%,respectively,of which soybean,corn,and wheat are the main carbon absorbing crops,contributing to 80.83%of the carbon absorption in the Heihe region.④The carbon footprint of farmland ecosystems in Heihe City accounted for a slightly lower proportion of the cultivated area in the same period(28.80%～66.44%),and the carbon sink capacity of agroecosystems in the region was stronger.[Conclusions]The farmland ecosystem in Heihe City shows a carbon surplus and plays a good role as an ecological barrier,but in the future,it is still necessary to deepen the"three reductions"in agriculture and improve the function of carbon sinks,so as to synergistically promote the goal of Carbon Peaking and Carbon Neutrality Goals and the high-quality development of the region.关键词
农田生态系统/碳源/碳汇/碳足迹/碳中和/黑龙江Key words
farmland ecosystem/carbon source/carbon sink/carbon footprint/carbon neutralization/Heilongjiang Province分类
农业科技引用本文复制引用
齐宏运,苗志风,周传芳,孙彦峰,魏小勇,牛广元,张璇璞,贾立明,孟玲禹,王德财..基于碳足迹的黑龙江省黑河市农田生态系统碳源/汇时序变化及其对碳中和的贡献[J].地质通报,2025,44(7):1254-1271,18.基金项目
中国地质调查局项目《小兴安岭黑河地区自然资源综合调查》(编号:DD20230504) Supported by the project of China Geological Survey(No.DD20230504) （编号:DD20230504）
