洱海湖滨农田生态系统的碳收支评估
Carbon Budget Assessment of Erhai Lakeside Farmland Ecosystem
摘要
Abstract
This study aims to examine CO2 flux characteristics in the lakeside farmland ecosystem of Erhai Lake under a rice-broad bean crop rotation and to clarify the contribution of this farmland system to regional carbon source/sink dynamics.The findings are intended to support a scientific understanding of the carbon cycle mechanism and inform strategies for optimizing agricultural management in the context of climate change.Eddy covariance technology was used to continuously monitor CO2 flux over a six-year period,and relevant meteorological data were collected to evaluate the influence of climatic factors.The main findings of this study are as follows:(1)Climatic conditions differ significantly between the rice-and broad bean-growing seasons.The rice season is characterized by high air temperature and relative humidity,initially decreasing then stabilizing vapor pressure deficit,large fluctuations in solar radiation,and decreasing wind speed and friction velocity.In contrast,the broad bean season features a decreasing and subsequently increasing air temperature,gradually decreasing relative humidity,increasing vapor pressure deficit and solar radiation,and a rise followed by a decline in wind speed and friction velocity.(2)CO2 flux exhibits pronounced diurnal and seasonal variations,showing a U-shaped pattern daily and a W-shaped pattern seasonally.Flux peaks occur during the jointing and heading stages of rice and during the pod-setting to grain-filling stages of broad bean.(3)At an hourly scale,the solar radiation is the dominant driver of CO2 flux variation,whereas at a daily scale,the relative humidity is the main controlling factor.(4)The rice-broad bean rotation system functions as a net carbon sink,with the rice season contributing approximately 3.5 times more carbon fixation than the broad bean season.Thus,the rice-growing period plays a dominant role in the ecosystem's overall carbon sink function due to its high carbon sequestration potential.关键词
涡动相关技术/水稻/蚕豆/CO2通量/碳收支/轮作Key words
Eddy covariance technique/Rice/Broad bean/CO2 flux/Carbon budget/Crop rotation分类
天文与地球科学引用本文复制引用
彭娟,徐安伦,李育,杨澄,张国涛,杜群..洱海湖滨农田生态系统的碳收支评估[J].大气科学,2025,49(5):1309-1323,15.基金项目
云南省科技厅科技计划项目202305AM070004,云南基层台站气象科技创新与能力提升计划项目STIAP202337,中国气象局创新发展专项CXFZ2023J047、CXFZ2025J147,云南省"兴滇人才支持计划"青年人才专项,云南省气象局创新团队项目2022CX03、2022CX05、2022CX08、2022QN06,大理州气象局创新团队项目DLCX202302 The Science and Technology Plan Project of Yunnan Provincial Science and Technology Department(Grant 202305AM070004),Project for Meteorological Science and Technology Innovation and Capacity Enhancement in Grassroots Stations for Yunnan Province(Grant STIAP202337),Innovation and Development Project of China Meteorological Administration(Grants CXFZ2023J047,CXFZ2025J147),Yunnan Province"Xingdian Talent Support Plan"Young Talent Special,Innovation Team Project of the Meteorological Bureau of Yunnan Province(Grants 2022CX03,2022CX05,2022CX08,2022QN06),the Innovation Team Project of the Meteorological Bureau of Dali Prefecture(Grant DLCX202302) （Grant 202305AM070004）
